What is the difference between Medicare Part A and Medicare Part B?

Medicare Part A is hospital insurance covering inpatient stays, skilled nursing facility care, hospice, and some home health care, while Medicare Part B is medical insurance covering doctor visits, outpatient care, preventive services, and durable medical equipment.

How do Medicare Part A and Part B costs compare in 2024?

Most people get Part A premium-free if they paid Medicare taxes for 10+ years, but if not, the 2024 Part A premium costs up to $505 monthly, whereas Part B has a standard monthly premium of $174.70 plus a $240 annual deductible.

Which is more important, Medicare Part A or Part B?

Neither is universally more important; Part A protects you from catastrophic hospital bills averaging over $15,000 per stay, while Part B covers essential daily medical care like doctor visits and lab tests that prevent minor issues from becoming hospitalizations.

What does Medicare Part B cover that Part A does not?

Part B covers outpatient services including doctor visits, specialist consultations, outpatient surgery, lab tests, X-rays, mental health care, and preventive screenings like mammograms and colonoscopies, none of which are covered by Part A unless you are formally admitted as an inpatient.

Can you have Medicare Part A without Part B?

Yes, you can enroll in Part A alone, which is common for people still working with employer coverage, but doing so leaves you without coverage for doctor visits and outpatient care, and you may face a late enrollment penalty if you add Part B later without qualifying for a Special Enrollment Period.

What is the biggest mistake beginners make with Medicare Part A and B?

The biggest mistake is assuming Original Medicare covers everything, because Part A and Part B leave roughly 20% of Part B costs and unlimited hospital coinsurance uncovered, which is why most beneficiaries add Medigap or Medicare Advantage within their initial enrollment window.

Are Medicare Part A and Part B interchangeable for coverage?

No, Part A and Part B are not interchangeable because they cover distinct services; Part A pays for hospital inpatient care only after a 3-day inpatient stay requirement, while Part B covers outpatient care, and neither will pay for the other's services unless specific conditions are met.

How do you use Medicare Part A and Part B together for a hospital stay?

For a hospital stay, Part A covers your room, meals, nursing care, and medications during inpatient admission after your $1,632 deductible, while Part B covers the doctor's services, surgeon's fees, and outpatient tests you receive during that same stay, with each part paying its separate share.

Can I switch from Medicare Part B back to Part A only?

Yes, you can voluntarily terminate Part B during the General Enrollment Period (January 1 to March 31) by contacting Social Security, but you must prove you have other credible coverage, and you will likely face a 10% late enrollment penalty if you re-enroll later without a Special Enrollment Period.

Difference Between

Difference Between Medicare a and B

Written byNex Virox Team

Editorial Team

Reviewed byVarshal Nirbhavane

Senior SEO & Organic Growth Professional · 5+ years

Published: September 9, 202624 min read

Quick answer

The main difference between Medicare a and B is that Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care, while Part B covers outpatient services, doctor visits, preventive care, and medically necessary supplies. Medicare a is hospital insurance, while B is medical insurance.

Key takeaways

Core distinction: Medicare A covers inpatient hospital stays, while Medicare B covers outpatient doctor visits and preventive care.
How each works: Medicare A is hospital insurance with no monthly premium for most enrollees; Medicare B is medical insurance with a standard monthly premium.
Cost difference: Medicare A has a $1,632 deductible per benefit period; Medicare B has a $240 annual deductible plus 20% coinsurance.
Best-fit use case: Choose Medicare A for surgeries and hospitalizations; choose Medicare B for lab tests, durable equipment, and annual wellness visits.
Most common mistake: Skipping Medicare B at 65 triggers a late enrollment penalty of 10% per year, lasting for life.

Table of Contents17 sections

Difference Between Medicare a and B: Comparison Table

Aspect	Medicare a	B
Definition	Medicare Part A is hospital insurance covering inpatient stays, skilled nursing, hospice, and home health care.	Medicare Part B is medical insurance covering doctor visits, outpatient care, preventive services, and durable medical equipment.
Purpose	Part A pays for care received during an overnight hospital admission or skilled nursing facility stay.	Part B pays for medically necessary services received outside a hospital, including lab tests and ambulance rides.
Core Mechanism	Part A uses a deductible per benefit period plus coinsurance for days beyond 60 in a hospital.	Part B uses an annual deductible plus a 20% coinsurance on most covered services after the deductible.
Coverage Scope	Part A covers semi-private rooms, meals, nursing care, drugs during a stay, and inpatient rehabilitation.	Part B covers clinical research, mental health outpatient, second opinions, and preventive screenings like mammograms.
Premium Cost	Most enrollees pay $0 monthly for Part A because they paid Medicare taxes while working.	Part B has a standard monthly premium of $174.70 in 2024, with higher amounts for high-income earners.
Enrollment Timing	Part A enrollment begins automatically at age 65 if you already receive Social Security benefits.	Part B requires active enrollment during the Initial Enrollment Period, which starts three months before turning 65.
Late Penalty	Part A late enrollment adds a 10% surcharge to premiums for twice the number of years you delayed.	Part B late enrollment adds a 10% surcharge for each full 12-month period you delayed coverage.
Deductible Amount	Part A inpatient hospital deductible is $1,632 per benefit period in 2024, not per calendar year.	Part B annual deductible is $240 in 2024, paid once per calendar year for all covered services.
Coinsurance Rate	Part A charges $0 coinsurance for days 1-60, then $408 per day for days 61-90 in 2024.	Part B charges 20% coinsurance on most covered services, with no daily or lifetime maximum.
Out-of-Pocket Max	Part A has no out-of-pocket maximum; costs can accumulate with multiple benefit periods in a year.	Part B has no out-of-pocket maximum; Medigap or Medicare Advantage plans add this protection.
Skilled Nursing	Part A covers skilled nursing facility care for up to 100 days per benefit period after a 3-day hospital stay.	Part B covers skilled nursing only when provided by home health agencies, not in a facility setting.
Home Health Care	Part A covers home health care only after a hospital stay, including part-time skilled nursing and therapy.	Part B covers home health care without a prior hospital stay, including occupational therapy and social services.
Hospice Care	Part A fully covers hospice care for terminal illness, including pain medication, chaplain services, and respite care.	Part B covers hospice-related doctor visits and durable medical equipment, but not the hospice benefit itself.
Blood Transfusion	Part A covers blood transfusions during an inpatient stay, with the first three pints not covered.	Part B covers blood transfusions in an outpatient setting, with the first three pints also not covered.
Durable Equipment	Part A covers durable medical equipment only when used during an inpatient hospital stay.	Part B covers durable medical equipment for home use, including wheelchairs, walkers, and hospital beds.
Preventive Services	Part A does not cover preventive screenings, annual wellness visits, or most vaccinations.	Part B covers annual wellness visits, flu shots, COVID-19 vaccines, and screenings for cancer and diabetes.
Emergency Care	Part A covers emergency room care only if you are formally admitted to the hospital as an inpatient.	Part B covers emergency room visits without admission, including observation stays and urgent care centers.
Ambulance Services	Part A covers ambulance transport only during an inpatient transfer between covered facilities.	Part B covers emergency ambulance transport to a hospital and non-emergency when medically necessary.
Doctor Services	Part A does not cover doctor fees; surgeons and physicians bill separately under Part B even during hospitalization.	Part B covers doctor services in hospitals, clinics, and offices, including specialists and primary care physicians.
Outpatient Surgery	Part A does not cover outpatient surgery performed in ambulatory surgical centers or hospital outpatient departments.	Part B covers outpatient surgery, including same-day procedures, anesthesia, and facility fees.
Mental Health	Part A covers inpatient mental health care in a psychiatric hospital with a 190-day lifetime limit.	Part B covers outpatient mental health visits, including therapy, counseling, and annual depression screenings.
Physical Therapy	Part A covers physical therapy only during an inpatient hospital stay or skilled nursing facility admission.	Part B covers outpatient physical, occupational, and speech therapy with no visit limit, subject to medical necessity.
Prescription Drugs	Part A covers drugs administered during an inpatient stay, including IV medications and chemotherapy.	Part B covers limited outpatient drugs, including injectables, infusion therapy, and some oral cancer drugs.
Clinical Trials	Part A covers inpatient costs for qualifying clinical trials, including hospital stays and related procedures.	Part B covers routine costs in clinical trials, including doctor visits, tests, and outpatient procedures.
Geographic Coverage	Part A covers hospital care throughout the United States and its territories, including Puerto Rico and Guam.	Part B covers doctor services nationwide, but coverage outside the U.S. is generally limited to emergencies.
Supplement Plans	Part A works with Medigap plans that cover coinsurance for hospital stays beyond 60 days.	Part B works with Medigap plans that cover the 20% coinsurance and excess charges.
Enrollment Source	Part A is funded by payroll taxes paid by employees and employers, with a 1.45% tax on earnings.	Part B is funded by general federal revenue and monthly premiums paid by enrollees.
Coverage Start	Part A coverage begins the first day of the month you turn 65 if you qualify automatically.	Part B coverage starts on the first day of the month after you enroll, with specific timing rules.
Typical Users	Part A primarily serves seniors and disabled individuals who need inpatient hospital care and skilled nursing.	Part B primarily serves seniors and disabled individuals who need routine doctor visits and outpatient treatments.
Best-Fit Scenario	Part A suits individuals planning hospital stays, surgeries, or skilled nursing rehabilitation after discharge.	Part B suits individuals managing chronic conditions, needing regular checkups, or requiring outpatient diagnostics.

What Is Medicare a?

Medicare Part A is hospital insurance for people 65 and older or with qualifying disabilities. It covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people get Part A without paying a monthly premium if they paid Medicare taxes while working.

Definition of Medicare a

Medicare Part A is a federally funded health insurance program that pays for inpatient hospital care, skilled nursing facility care, hospice services, and limited home health care. It is one of four parts of Original Medicare. Eligibility typically begins at age 65 or after 24 months of Social Security disability benefits.

Key Characteristics of Medicare a

Characteristic	What It Means in Practice
Premium-free eligibility	You pay no monthly premium if you or your spouse worked 40 quarters (10 years) paying Medicare payroll taxes.
Inpatient hospital coverage	Part A pays for semi-private rooms, meals, nursing care, and medications during a covered hospital stay.
Skilled nursing facility care	Part A covers up to 100 days per benefit period in a Medicare-certified skilled nursing facility after a 3-day hospital stay.
Hospice care	Part A covers hospice for terminally ill patients with a life expectancy of 6 months or less, including pain management and support services.
Home health care	Part A covers part-time skilled nursing care, physical therapy, and occupational therapy ordered by a doctor for homebound patients.
Deductible per benefit period	In 2025, you pay a $1,676 deductible for each hospital benefit period before Part A coverage begins.
Benefit period system	A benefit period starts when you enter a hospital and ends after 60 consecutive days without inpatient care. You can have multiple benefit periods per year.
No out-of-pocket maximum	Part A has no annual cap on your cost-sharing, so extended hospital stays can create significant financial exposure.
Coverage gap for long stays	For days 61-90 in a hospital, you pay $419 per day in 2025. After 90 days, you use lifetime reserve days.
Medigap compatibility	Medicare Supplement (Medigap) plans can cover Part A deductibles, coinsurance, and additional hospital days beyond standard limits.

Common Examples of Medicare a

Inpatient surgery - A hip replacement requiring a 2-night hospital stay falls under Part A coverage for the room and nursing care.
Stroke rehabilitation - After a 3-day hospital admission, Part A covers up to 100 days in a skilled nursing facility for physical therapy.
Terminal illness hospice - A patient with advanced cancer receives pain management, counseling, and respite care through Part A hospice benefits.
Homebound physical therapy - A patient recovering from a fall receives part-time visiting nurse and therapy services at home under Part A.
Emergency room admission - An ER visit that results in a formal hospital admission triggers Part A coverage for the inpatient stay.
Blood transfusions - Part A covers blood transfusions during an inpatient stay after you pay for the first 3 pints of blood.
Psychiatric hospital care - Part A covers inpatient mental health treatment in a general hospital, with a 190-day lifetime limit in psychiatric facilities.
Clinical research trials - Part A covers hospital costs for patients enrolled in Medicare-approved clinical trials testing new treatments.
Limited home health aide - Part A covers part-time home health aide services for personal care when you also need skilled nursing or therapy.
Inpatient care abroad - Part A generally does not cover hospital care outside the United States, except in rare emergency situations near the border.

Advantages and Limitations of Medicare a

Advantages	Limitations
Most enrollees pay no monthly premium for Part A, making hospital coverage affordable for retirees.	Part A does not cover outpatient doctor visits, lab tests, or medical equipment, which require Part B coverage.
Part A covers the full cost of a semi-private hospital room, including meals and routine nursing care.	The $1,676 deductible per benefit period can be a financial shock for a single hospital admission.
Hospice care under Part A includes medications, medical equipment, and bereavement counseling at no additional cost.	Skilled nursing facility coverage requires a prior 3-day inpatient hospital stay, which many patients do not meet.
Home health care under Part A helps patients recover at home instead of in a facility, reducing overall care costs.	Part A covers only 100 days of skilled nursing care per benefit period, and days 21-100 require a $204.50 daily coinsurance in 2025.
Part A is accepted by nearly all hospitals and skilled nursing facilities across the United States.	There is no annual out-of-pocket maximum, so a prolonged hospital stay can generate unlimited coinsurance costs.
You can enroll in Part A without paying a premium even if you continue working past age 65, as long as you have employer coverage.	If you delay Part A enrollment and do not have qualifying coverage, you may face a late enrollment penalty of 10% of the premium for twice the years delayed.
Part A covers inpatient blood transfusions, surgeries, and organ transplants when medically necessary.	Part A does not cover custodial care, such as help with bathing or dressing, when that is the only care you need.
Medigap plans can cover Part A deductibles and coinsurance, making hospital costs predictable and manageable.	Part A pays only for medically necessary care, not for private rooms, television, telephone, or other convenience items.
Part A coverage is available to people under 65 with end-stage renal disease or amyotrophic lateral sclerosis (ALS).	You must pay a monthly premium of up to $518 in 2025 if you do not qualify for premium-free Part A through work history.
Part A includes a 190-day lifetime reserve for psychiatric hospital care, which exceeds typical Medicare coverage limits.	Part A does not cover dental care, vision exams, hearing aids, or routine foot care, even during an inpatient stay.

What Is Medicare Part B?

Medicare Part B is medical insurance covering doctor visits, outpatient care, preventive services, and durable medical equipment. It exists to pay for medically necessary services that Part A hospital insurance does not cover. Most beneficiaries pay a monthly premium, and it works alongside Part A to form Original Medicare.

Definition of Medicare Part B

Medicare Part B is the federally administered outpatient medical insurance component of Original Medicare. It covers physician services, clinical laboratory tests, outpatient hospital care, and specific preventive screenings. Unlike Part A, Part B requires a monthly premium, an annual deductible, and typically 20 percent coinsurance for most covered services after the deductible is met.

Key Characteristics of Medicare Part B

Characteristic	What It Means in Practice
Monthly premium	Most beneficiaries pay $174.70 per month in 2024, though higher-income individuals pay more through income-related monthly adjustment amounts.
Annual deductible	You pay the first $240 of covered services in 2024 before Medicare starts paying its share.
20 percent coinsurance	After the deductible, you pay 20 percent of the Medicare-approved amount for most covered services.
No out-of-pocket cap	Original Medicare Part B has no annual maximum on your out-of-pocket spending, unlike Medicare Advantage plans.
Nationwide coverage	Part B works at any doctor or hospital that accepts Medicare assignment anywhere in the United States.
Preventive services at no cost	Screenings like mammograms, colonoscopies, and annual wellness visits have no coinsurance when performed by participating providers.
Durable medical equipment	Covers wheelchairs, walkers, hospital beds, and oxygen equipment when prescribed by a Medicare-enrolled physician.
Enrollment timing penalty	Delaying enrollment after turning 65 without creditable coverage adds a 10 percent premium surcharge for each full 12-month period.
No prescription drug coverage	Part B excludes most self-administered prescription drugs; you need a separate Part D plan for medications.
Medicare-approved amounts	Providers who accept assignment agree to charge no more than the Medicare-approved rate, limiting your financial exposure.

Common Examples of Medicare Part B

Annual wellness visit – A free preventive checkup every 12 months to review your health history and create a personalized prevention plan.
Mammogram screening – A covered breast cancer screening every 12 months for women aged 40 and older, with no coinsurance.
Diabetes self-management training – Educational sessions teaching you to monitor blood sugar, use insulin, and manage your diet effectively.
Outpatient physical therapy – Medically necessary rehabilitation services provided in a clinic or therapist's office to restore movement and function.
Kidney dialysis treatment – Life-sustaining dialysis sessions for beneficiaries with end-stage renal disease, covered at 80 percent of approved costs.
Emergency ambulance transport – Covered ground ambulance rides to a hospital when immediate medical attention is necessary and other transport would endanger your health.
Flu and pneumonia vaccines – Preventive immunizations administered by participating providers with no cost-sharing when medically appropriate.
Home health care services – Part-time skilled nursing care, physical therapy, or speech-language pathology services ordered by your doctor and provided at home.
Cardiac rehabilitation – Structured exercise and education programs for beneficiaries recovering from heart attacks, heart failure, or heart surgery.
Durable medical equipment rental – Monthly rental of oxygen equipment, hospital beds, or power wheelchairs when prescribed for use in your home.

Advantages and Limitations of Medicare Part B

Advantages	Limitations
Provides access to any Medicare-accepting doctor nationwide without referrals or network restrictions.	Charges a monthly premium that increases annually, creating a financial burden for fixed-income retirees.
Covers a broad range of outpatient services including diagnostics, surgeries, and preventive screenings.	Leaves you responsible for 20 percent coinsurance, which can become substantial for expensive procedures like chemotherapy.
Includes free preventive services like cancer screenings and cardiovascular risk assessments to catch conditions early.	Offers no catastrophic cap on out-of-pocket spending, potentially exposing you to unlimited medical costs in a serious illness year.
Works with Medigap policies to fill gaps in coverage, allowing predictable monthly costs rather than unpredictable bills.	Excludes routine dental care, vision exams, hearing aids, and most long-term care services entirely.
Guaranteed enrollment during initial eligibility periods without medical underwriting or health status questions.	Imposes a permanent 10 percent premium penalty for each year you delay enrollment past age 65 without creditable coverage.
Pays for ambulance transport and emergency care at any hospital in the United States, including during travel.	Requires you to meet a new deductible every calendar year, restarting your financial responsibility each January.
Provides coverage for clinical research trials, giving beneficiaries access to experimental treatments and therapies.	Does not cover most prescription drugs you take at home, forcing you to purchase separate Part D prescription coverage.
Offers predictable cost-sharing of 20 percent for most services, making budgeting easier than private insurance copays.	Requires providers to accept assignment for full coverage; non-participating providers can charge up to 15 percent more.
Includes mental health outpatient services like individual therapy and psychiatric evaluations at standard Part B rates.	Denies coverage for routine foot care, acupuncture, chiropractic services, and cosmetic surgery in most circumstances.
Automatically enrolls most Social Security beneficiaries at age 65, preventing coverage gaps for retirees.	Charges higher premiums to individuals earning above $103,000 per year, with surcharges reaching $594 per month in 2024.

Similarities Between Medicare a and B

Shared Aspect	How Medicare a and B Are Alike
Federal Program	Medicare Part A and Part B are both administered by the U.S. federal government through CMS.
Eligibility Age	Medicare Part A and Part B both become available to most U.S. citizens at age 65.
Enrollment Window	Medicare Part A and Part B share the same initial 7-month enrollment period around your 65th birthday.
Original Medicare	Medicare Part A and Part B together form what is officially called Original Medicare.
Coverage Basis	Medicare Part A and Part B both base coverage on medically necessary services ordered by a doctor.
Provider Network	Medicare Part A and Part B both allow you to see any doctor or hospital that accepts Medicare assignment.
No Annual Cap	Medicare Part A and Part B both lack an annual out-of-pocket maximum for covered services.
Coinsurance Costs	Medicare Part A and Part B both require you to pay coinsurance after a deductible is met.
Deductible System	Medicare Part A and Part B both charge separate annual deductibles before coverage kicks in.
Medigap Compatibility	Medicare Part A and Part B both work with Medigap supplemental insurance plans to cover gaps.
Part D Link	Medicare Part A and Part B both allow enrollment in a standalone Medicare Part D prescription drug plan.
No Network HMO	Medicare Part A and Part B both use a fee-for-service model, not an HMO network restriction.
Claims Processing	Medicare Part A and Part B both process claims through the same regional Medicare Administrative Contractors.
Appeal Rights	Medicare Part A and Part B both provide a 5-level appeal process for denied services or claims.
Secondary Payer	Medicare Part A and Part B both follow the same coordination rules when you have employer group coverage.
Late Penalties	Medicare Part A and Part B both impose permanent late enrollment penalties if you delay signing up without creditable coverage.
Special Enrollment	Medicare Part A and Part B both offer Special Enrollment Periods for those still working past age 65.
Card Issuance	Medicare Part A and Part B both appear on the same red, white, and blue Medicare card with your ID number.
Online Access	Medicare Part A and Part B both use the MyMedicare.gov portal for viewing claims and coverage details.
Telehealth Coverage	Medicare Part A and Part B both expanded telehealth coverage for certain services during public health emergencies.
Preventive Services	Medicare Part A and Part B both cover certain preventive screenings at no extra cost when ordered by a physician.
Skilled Care	Medicare Part A and Part B both cover skilled nursing care, though under different conditions and settings.
Home Health	Medicare Part A and Part B both cover medically necessary home health visits, but under separate benefit rules.
Durable Equipment	Medicare Part A and Part B both cover durable medical equipment, but only when medically necessary and prescribed.
Hospital Services	Medicare Part A and Part B both cover hospital-related services, but Part A covers inpatient stays and Part B covers outpatient care.
Doctor Visits	Medicare Part A and Part B both pay for physician services, but Part B covers most doctor visits while Part A covers inpatient doctor care.
Annual Wellness	Medicare Part A and Part B both support the Annual Wellness Visit, though Part B primarily pays for it.
Non-Covered Items	Medicare Part A and Part B both exclude routine dental, vision, hearing aids, and long-term custodial care.
Foreign Coverage	Medicare Part A and Part B both provide very limited emergency coverage when traveling outside the United States.
Cost Sharing	Medicare Part A and Part B both require you to pay 20% coinsurance for most services, but Part A has different rules for inpatient stays.

Medicare a or B: Which Should You Choose?

Choose Medicare Part A if you need hospital coverage and qualify for premium-free Part A. Choose Medicare Part B if you need doctor visits and outpatient care. The deciding variable is your employment status and income, which determines Part A costs and Part B late penalties.

When to Use Medicare a

Choose Medicare a when you are 65 or older and have worked 40 quarters (10 years) paying Medicare taxes. You get Part A with a $0 monthly premium, covering inpatient hospital stays, skilled nursing facility care, hospice, and home health care. Select Part A if you have other creditable coverage for doctor visits. The Part A deductible is $1,632 per benefit period in 2024, with no monthly premium for most enrollees.

When to Use B

Choose B when you need coverage for doctor visits, outpatient procedures, preventive services, medical equipment, and lab tests. Enroll in Part B if you are retired, have no employer group health plan, or are under 65 with a disability. The standard Part B premium is $174.70 per month in 2024, plus a $240 annual deductible. You pay 20% coinsurance after meeting the deductible. Avoid delaying Part B if you lack creditable drug or group coverage, because late enrollment adds a 10% premium surcharge for each full 12-month period you wait.

Common Myth	The Reality
"Medicare Part A is completely free for everyone."	Part A is free only if you or your spouse paid Medicare taxes for at least 10 years; otherwise, you pay up to $505 monthly in 2024.
"Medicare Part B covers all your doctor visits with no extra costs."	Part B covers 80% of approved services after your $240 annual deductible; you pay the remaining 20% coinsurance plus monthly premiums.
"You must sign up for Part B at age 65 even if you have employer coverage."	You can delay Part B without penalty if you have creditable group health coverage; you get an 8-month Special Enrollment Period after it ends.
"Part A and Part B together cover all hospital and medical expenses."	Original Medicare leaves gaps like deductibles, coinsurance, and copays; Medigap or Medicare Advantage plans fill these gaps for extra premiums.
"Part B is optional, so skipping it saves you money with no future penalty."	Delaying Part B without creditable coverage adds a 10% lifetime premium surcharge for each full 12-month period you wait.
"Medicare Part A covers long-term nursing home care completely."	Part A covers only up to 100 days of skilled nursing facility care per benefit period, with full coinsurance after day 20.
"Part B includes free annual physicals, vision, dental, and hearing exams."	Part B covers a one-time "Welcome to Medicare" visit and annual wellness visits, but routine vision, dental, and hearing are excluded.
"Your Part B premium is always the same standard amount each year."	Higher-income beneficiaries pay Income-Related Monthly Adjustment Amounts (IRMAA), raising Part B premiums from $174.70 to $594.00 monthly in 2024.
"Part A and Part B are automatically enrolled for everyone turning 65."	Auto-enrollment applies only if you already receive Social Security or Railroad Retirement benefits; otherwise, you must apply manually.
"Part B covers emergency ambulance rides and all urgent care visits fully."	Part B covers ambulance transport only when medically necessary and other transportation isn't safe; you still pay 20% coinsurance after deductible.
"Medicare Part A covers inpatient surgery with no daily copayment."	Part A charges a $1,632 deductible per benefit period in 2024, plus $0 for days 1-60 but $408 per day for days 61-90.
"You can use any doctor or hospital in the United States with Part B."	Part B covers any provider who accepts Medicare assignment; you pay more if you see a non-participating provider who charges above the approved amount.
"Part B covers routine foot care, like nail trimming, for all beneficiaries."	Routine foot care is excluded unless you have diabetes or peripheral neuropathy; Part B covers only medically necessary podiatry services.
"Part A covers all home health care services without any out-of-pocket costs."	Part A covers intermittent skilled nursing and therapy at home, but you pay 20% coinsurance for durable medical equipment and no copay for services.
"Part B premium is deducted from your Social Security check automatically."	If you don't receive Social Security yet, you get billed quarterly by Medicare; you can also set up automatic bank payments through Medicare's Easy Pay.
"Medicare Part A and Part B both cover preventive screenings at no cost."	Part B covers most preventive services like mammograms and colonoscopies at no cost, but Part A covers only inpatient preventive care, not outpatient screenings.
"You can change from Part B to a private plan anytime during the year."	You can only enroll in or drop Part B during the General Enrollment Period (Jan 1–Mar 31) or a Special Enrollment Period, not anytime.
"Part B covers clinical trials and experimental treatments without prior approval."	Part B covers routine costs in Medicare-approved clinical trials, but you still pay 20% coinsurance; experimental treatments not in trials are generally denied.
"Part A covers hospice care only if you are in a hospital setting."	Hospice care under Part A is provided at home, in a hospice facility, or in a nursing home; you pay minimal copays for drugs and respite care.
"Part B covers chiropractic services, acupuncture, and massage therapy fully."	Part B covers only spinal manipulation for acute subluxation and acupuncture for chronic low back pain; massage therapy is never covered.
"Your Part B deductible resets every calendar year, not per service."	Correct, but many people mistakenly think each service has a separate deductible; you pay the full $240 once per year, then 20% coinsurance applies.
"Part B covers all outpatient mental health services with a standard copay."	Part B covers 80% of approved mental health visits after deductible, but you pay 20% coinsurance; there is no separate copay structure.
"Medicare Part A and Part B together include prescription drug coverage."	Original Medicare excludes most outpatient drugs; you must enroll in a separate Part D plan or a Medicare Advantage plan with drug coverage.
"You must enroll in Part B at 65 even if you have VA or TRICARE coverage."	VA and TRICARE are creditable coverage, so you can delay Part B without penalty, but losing that coverage triggers an 8-month Special Enrollment Period.
"Part B covers all laboratory tests, including routine blood work, at 100%."	Part B covers medically necessary lab tests at 100% with no deductible, but routine screening tests like annual thyroid panels may not be covered.
"Part A covers blood transfusions completely, including the cost of blood."	Part A covers the transfusion service but not the first three pints of blood each calendar year; you pay for those or donate to replace them.
"Part B has no annual out-of-pocket maximum, unlike private plans."	Correct, Part B has no cap; your 20% coinsurance can be unlimited, which is why Medigap plans are recommended to cover these costs.
"You can enroll in Part B online anytime after turning 65 without a deadline."	You have a 7-month Initial Enrollment Period (3 months before, the month of, and 3 months after your 65th birthday); missing it triggers penalties.
"Part A covers semi-private rooms, but you can upgrade to private at no extra cost."	Part A covers semi-private rooms only; if you choose a private room without medical necessity, you pay the full cost difference out-of-pocket.
"Part B covers all outpatient physical therapy without session limits."	Part B covers medically necessary PT with no hard visit cap, but it applies a $2,330 annual limit in 2024, after which you need re-certification.

Conclusion

Difference Between Medicare a and B comes down to coverage: Part A covers hospital stays, while Part B covers doctor visits and outpatient care. Choose Part A if you need inpatient treatment. Choose Part B for preventive services and medical equipment. Most people enroll in both.

FAQs on Difference Between Medicare a and B

What is the difference between Medicare Part A and Medicare Part B?: Medicare Part A is hospital insurance covering inpatient stays, skilled nursing facility care, hospice, and some home health care, while Medicare Part B is medical insurance covering doctor visits, outpatient care, preventive services, and durable medical equipment.
How do Medicare Part A and Part B costs compare in 2024?: Most people get Part A premium-free if they paid Medicare taxes for 10+ years, but if not, the 2024 Part A premium costs up to $505 monthly, whereas Part B has a standard monthly premium of $174.70 plus a $240 annual deductible.
Which is more important, Medicare Part A or Part B?: Neither is universally more important; Part A protects you from catastrophic hospital bills averaging over $15,000 per stay, while Part B covers essential daily medical care like doctor visits and lab tests that prevent minor issues from becoming hospitalizations.
What does Medicare Part B cover that Part A does not?: Part B covers outpatient services including doctor visits, specialist consultations, outpatient surgery, lab tests, X-rays, mental health care, and preventive screenings like mammograms and colonoscopies, none of which are covered by Part A unless you are formally admitted as an inpatient.
Is there a penalty for delaying Medicare Part B enrollment?: Yes, delaying Part B without creditable coverage through an employer causes a permanent 10% premium surcharge for each full 12-month period you waited, which you pay for as long as you have Part B, unlike the one-time nature of most other penalties.
Can you have Medicare Part A without Part B?: Yes, you can enroll in Part A alone, which is common for people still working with employer coverage, but doing so leaves you without coverage for doctor visits and outpatient care, and you may face a late enrollment penalty if you add Part B later without qualifying for a Special Enrollment Period.
What is the biggest mistake beginners make with Medicare Part A and B?: The biggest mistake is assuming Original Medicare covers everything, because Part A and Part B leave roughly 20% of Part B costs and unlimited hospital coinsurance uncovered, which is why most beneficiaries add Medigap or Medicare Advantage within their initial enrollment window.
Are Medicare Part A and Part B interchangeable for coverage?: No, Part A and Part B are not interchangeable because they cover distinct services; Part A pays for hospital inpatient care only after a 3-day inpatient stay requirement, while Part B covers outpatient care, and neither will pay for the other's services unless specific conditions are met.
How do you use Medicare Part A and Part B together for a hospital stay?: For a hospital stay, Part A covers your room, meals, nursing care, and medications during inpatient admission after your $1,632 deductible, while Part B covers the doctor's services, surgeon's fees, and outpatient tests you receive during that same stay, with each part paying its separate share.
Can I switch from Medicare Part B back to Part A only?: Yes, you can voluntarily terminate Part B during the General Enrollment Period (January 1 to March 31) by contacting Social Security, but you must prove you have other credible coverage, and you will likely face a 10% late enrollment penalty if you re-enroll later without a Special Enrollment Period.