You’re turning 65 soon, and suddenly everyone’s talking about Medicare Parts A and B, but what does Medicare Parts A and B cover, exactly?
So What Does Medicare Parts A and B Cover?
Here’s the truth: most people sign up for Medicare without fully understanding what they’re getting. The paperwork is confusing, the terminology feels overwhelming, and you’re left wondering if you’re making the right choices for your healthcare and your wallet.
Understanding Medicare Parts A and B isn’t just about checking a box during enrollment. It’s about knowing what you’ll pay out of pocket, which services are included, and most importantly, where the gaps are that could cost you thousands.
Key Highlights
- Part A covers hospital stays, skilled nursing, and hospice care, but you’ll face a $1,632 deductible per benefit period and potential coinsurance if your stay extends beyond 60 days.
- Part B handles doctor visits, outpatient care, and preventive services, but you’ll pay a $240 annual deductible PLUS 20% of all Medicare-approved costs with NO out-of-pocket maximum.
- Together, Parts A and B provide solid foundational coverage, but the cost-sharing gaps mean you could face unlimited expenses without a supplemental plan to protect you.
Let’s break down exactly what Medicare Parts A and B cover, what they don’t, and why understanding these details helps you make confident decisions about your healthcare.
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Medicare Part A Coverage: Hospital Insurance Explained
Part A is your hospital insurance, part of Medicare Parts A and B, which protects you when you need inpatient care.
Most people don’t pay a monthly premium for Part A if they or their spouse paid Medicare taxes while working. You automatically qualify for premium-free Part A once you’ve worked 40 quarters (about 10 years). If you don’t meet this requirement, you can still purchase Part A, but it costs up to $518 per month.
Part A is often called “free” because there’s no monthly bill for most beneficiaries. But “premium-free” doesn’t mean “cost-free”; you’ll still pay deductibles and coinsurance when you use these services.
What Part A covers:
- Hospital stays (inpatient care) – semiprivate rooms, meals, nursing care, and necessary tests during your hospital admission
- Skilled nursing facility care – up to 100 days per benefit period after a qualifying 3-day hospital stay (days 1-20 are fully covered; days 21-100 require $209.50 daily coinsurance)
- Hospice care – compassionate end-of-life care, including medical services, counseling, and medications for terminal illness
- Home health care (limited) – part-time skilled nursing, physical therapy, or other services ordered by your doctor following a hospital or skilled nursing stay
Here’s what you’ll pay: a $1,676 deductible per benefit period (not per year), plus $0 coinsurance for days 1-60 in the hospital. After day 60, you pay $419 per day through day 90, and $838 per day for lifetime reserve days.
If you’re hospitalized for 70 days, you’ll pay the $1,676 deductible PLUS $4,190 in coinsurance for those 10 extra days. That’s $5,866 out of pocket, and that’s just from your original medicare coverage under Part A.
Medicare Part B Coverage: Medical Insurance Breakdown
Part B handles your medical insurance, the other half of what does Medicare Parts A and B cover for your healthcare needs.
Unlike Part A, almost everyone pays a monthly premium for Part B. The standard amount is $185 per month in 2025. You’ll pay this regardless of how often you use your benefits.
Higher-income beneficiaries pay more; roughly 8% of Medicare beneficiaries pay income-related monthly adjustment amounts that can range from $259 to $628.90, depending on their income.
Part B covers two main categories: medically necessary services to diagnose or treat your condition, and preventive services to help you stay healthy. Together, these benefits form the medical side of original medicare coverage.
What Part B covers:
- Doctor visits and outpatient care – office visits, specialist consultations, outpatient surgeries, and emergency room services
- Preventive services and screenings – annual wellness visits, mammograms, colonoscopies, diabetes screenings, and vaccines (flu, pneumonia, COVID-19, hepatitis B)
- Durable medical equipment – wheelchairs, walkers, oxygen equipment, hospital beds, and diabetic supplies prescribed by your doctor
- Ambulance services – emergency transportation and, in limited cases, non-emergency medical transport when no other option exists
- Mental health care – outpatient counseling, therapy, and psychiatric services at approved facilities
In 2025, you’ll pay a $257 annual deductible for Part B services. After that, you’re responsible for 20% of the Medicare-approved amount for most services; Medicare covers the remaining 80%.
Here’s the challenge: that 20% coinsurance has NO LIMIT. If you have $50,000 in doctor bills this year, you’ll owe $10,000 out of pocket after your deductible.
There’s no cap on your annual spending, which is why understanding what does Medicare Parts A and B cover, and what they don’t, matters so much for your financial planning.
For more details on specific services covered under Part B, visit the official Medicare coverage page.
What Medicare Parts A and B DON’T Cover: The Critical Gaps
Here’s what surprises most new beneficiaries: medicare Parts A and B benefits are excellent, but they’re not complete.
Original Medicare provides solid hospital and medical benefits, but leaves significant gaps that can cost you thousands. Understanding these limitations helps you plan ahead and avoid financial shocks.
No Out-of-Pocket Maximum
Unlike most health plans, Original Medicare has no annual cap on what you’ll pay. That 20% coinsurance for Part B services?
It applies to every dollar you spend, all year long. If you rack up $100,000 in medical bills, you’re responsible for $20,000 plus deductibles.
Prescription Drugs (Need Part D)
Original Medicare doesn’t cover most outpatient prescription medications. You’ll need a separate Part D plan to get help with drug costs at the pharmacy.
Dental, Vision, and Hearing
Routine dental cleanings, eye exams for glasses, and hearing aids are not covered by Original Medicare. You’ll pay the full cost unless you have supplemental benefits.
Long-Term Care
Nursing home stays, assisted living, and custodial care for chronic conditions are largely excluded. Medicare covers short-term skilled nursing after a hospital stay, but long-term residential care comes out of your pocket.
International Travel (Except Emergencies)
Original Medicare generally doesn’t cover healthcare services received outside the United States. Limited exceptions exist for certain emergencies near the border.
These gaps add up fast. A serious illness could cost you tens of thousands in coinsurance alone, and that’s before considering the services Medicare doesn’t touch at all.
The good news?
You have options to fill these gaps, and understanding them starts with knowing exactly what you’re facing in real-world costs.
Real-World Cost Examples: What You’ll Actually Pay?
Numbers on paper don’t always hit home until you see what they mean for YOUR wallet.
Let’s look at three common scenarios that show how original medicare coverage actually works, and what you’ll owe.
Scenario 1: Five-day Hospital Stay for Pneumonia
You’re admitted to the hospital for pneumonia treatment. You’ll pay the $1,676 Part A deductible upfront. Since your stay is under 60 days, Medicare covers the rest of your hospital costs at 100%.
But here’s the catch: your doctor bills separately under Part B. After meeting your $257 Part B deductible, you’ll owe 20% of all physician charges, which could add $500 to $1,000 to your bill.
Total out-of-pocket: $2,400 to $2,900
Scenario 2: Outpatient Knee Arthroscopy
Your orthopedic surgeon performs an outpatient knee procedure. The Medicare-approved amount is $3,500 for the surgery plus $1,200 for anesthesia. You pay the $257 Part B deductible first.
Then you owe 20% of the remaining charges, that’s $887. Physical therapy sessions afterward? Add another 20% for each visit.
Total out-of-pocket: $1,144+ (plus ongoing therapy costs)
Scenario 3: monthly cardiologist visits for heart condition
You see your cardiologist every month for monitoring and medication adjustments. Each visit costs $250 (Medicare-approved amount).
After your Part B deductible, you pay 20% of each visit, $50 per month. Over a year, that’s $600 just for routine follow-ups. Add in quarterly EKGs and annual stress tests? You’re looking at another $400 to $600.
Total out-of-pocket: $1,000 to $1,200 annually
See the pattern?
These costs accumulate quickly, and there’s no ceiling. A serious illness requiring hospitalization, surgery, and ongoing specialist care could easily cost $10,000 or more out of pocket in a single year.
Without an out-of-pocket maximum, your financial exposure is unlimited, which is exactly why so many beneficiaries look for ways to protect themselves beyond original medicare coverage alone.
How Medicare Parts A and B Work Together?
Parts A and B function as a team, each handling different aspects of your healthcare needs.
How they coordinate:
- Part A covers your hospital facility costs (room, meals, nursing care)
- Part B covers professional services (doctors, tests, outpatient care)
- Both can apply during the same medical event, like a hospital stay
Together, Parts A and B form what’s known as “Original Medicare”—the foundation of the Medicare program. Understanding Medicare Parts A and B benefits requires seeing them as complementary, not redundant.
The Medicare Parts A and B work best when you have BOTH, but even together, they’re just the starting point for comprehensive protection.
Why Understanding Your Benefits Matters for Your Next Steps?
Knowledge about Parts A and B puts YOU in control of your healthcare decisions.
Now that you understand what original medicare coverage includes and what it doesn’t, you can make smart choices about filling those gaps. Most beneficiaries add supplemental protection to avoid the unlimited out-of-pocket exposure we discussed earlier.
Your main options:
- Medigap (Medicare supplement plans) – works alongside Original Medicare to cover deductibles, coinsurance, and copays
- Medicare Advantage – replaces Original Medicare with an all-in-one plan through a private insurer
- Medi-Share 65+ HealthShare Plan – a faith-based alternative to traditional Medicare supplement plans, helping members share eligible medical expenses while maintaining flexibility and affordability
Understanding Parts A and B helps you evaluate these options intelligently. When a Medigap agent mentions “covering the Part B coinsurance,” you’ll know exactly what that means: protection from that 20% you’d otherwise pay on every doctor visit, test, and procedure.
You can calculate whether paying a monthly supplement amount makes sense compared to your potential out-of-pocket exposure.
The same knowledge helps with Medicare Advantage plans. You’ll understand what you’re giving up (unrestricted doctor choice under original medicare coverage) and what you’re gaining (out-of-pocket maximums, possible extra benefits).
You won’t be guessing, you’ll be deciding based on facts.
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So, What Does Medicare Parts A and B Cover?
Understanding what does Medicare Parts A and B cover is the foundation for making confident healthcare decisions.
Parts A and B provide excellent hospital and medical benefits, but the cost-sharing gaps are real. You could face unlimited out-of-pocket expenses without additional protection, from deductibles and coinsurance to services not included at all. That’s not a scare tactic—it’s simply how Original Medicare works.
The good news?
You don’t have to face these gaps alone.
Medicare supplement plans are specifically designed to work alongside Parts A and B, covering the costs that would otherwise come from your pocket.
Understanding your baseline benefits makes choosing the right supplement straightforward instead of overwhelming.
Talk to a licensed Medigap specialist to find the right supplement for your needs. We’re here to answer your questions, explain your options, and help you build a Medicare strategy that protects your health and finances.
Whitney Kline is one of your Personal Benefits Managers at Medigap Advisors. She loves working for Medigap Advisors especially helping clients choose the right Medicare plan.