What Medicare Parts A, B, and D Actually Cover in 2026 (And What They Don't)

Introduction: The Coverage Map Nobody Explains Well

Medicare's coverage rules are specific, detailed, and often counterintuitive. Most people don't discover the gaps until they're facing a bill. This guide breaks down exactly what you're paying for with each part.

Medicare Part A: Hospital Coverage (Detailed Breakdown)

Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and home health services. The costs and coverage levels depend on how long you stay.

Inpatient Hospital Stays: The Benefit Period System

This is where Part A gets confusing. Understanding "benefit periods" is critical.

What is a benefit period? A benefit period starts the day you're admitted to a hospital and ends 60 consecutive days after you're discharged. If you're readmitted after 60 days, a new benefit period begins. You could have multiple benefit periods in a year if you're hospitalized multiple times with at least 60 days between discharges.

Example: How Part A's Benefit Period Works

Scenario: Maria, 68, is hospitalized for pneumonia on January 10, 2026. She's discharged on January 30. She's readmitted for complications on February 25.

• First hospitalization (Jan 10–30, 20 days): $0 copay. Benefit period runs Jan 10 – Mar 1.
• Second hospitalization (Feb 25–Mar 10, 13 days): Still within the 60-day window of the first benefit period (only 26 days between discharge and readmission). This stay counts toward the same benefit period. Still $0 copay. Total: 33 days in benefit period.
• If she's readmitted July 1 (after 60+ days): A new benefit period starts. She pays another $1,676 deductible.

Skilled Nursing Facility (SNF) Care

Medicare Part A covers skilled nursing facility care only after a qualifying 3-day hospital stay. The criteria are strict.

Hospice Care

Medicare covers hospice care when your doctor certifies you're terminally ill (expected to live 6 months or less). Coverage includes:

• Doctor visits
• Nursing care
• Pain medications and symptom management drugs
• Counseling and spiritual care
• Volunteer services
• Equipment and supplies

Cost: Small copays only ($5 for medications, up to $5 per service). Much of hospice is fully covered.

Home Health Services

Medicare covers home health only if all four conditions are met:

1. You're homebound (leaving home requires considerable effort/help)
2. A doctor orders home health services
3. You need skilled nursing care OR physical/speech/occupational therapy
4. You're using the services of a Medicare-certified home health agency

Covered services: Skilled nursing, physical therapy, occupational therapy, speech therapy, social work, home health aide services (only if you also need skilled care), medical equipment.

Cost: $0 copay for services; 20% copay for durable medical equipment.

What Part A Does NOT Cover

• Long-term custodial care: Assisted living, memory care, nursing home care for non-medical reasons (help with bathing, dressing, eating). NOT COVERED. Average cost: $60,000–150,000/year.
• Private duty nursing: Nursing care that's not "skilled" (e.g., someone to provide personal care 24/7). NOT COVERED.
• Medications outside the hospital: Prescriptions after discharge. You need Part D for these.
• Routine dental, vision, hearing: Not covered by any Medicare part (standalone plans available).
• Eyeglasses, hearing aids, dentures: NOT COVERED.

Medicare Part B: Medical Insurance (Line-by-Line)

Part B covers doctor visits, outpatient care, preventive services, and medical equipment. Unlike Part A, Part B requires active enrollment and a monthly premium.

Doctor Visits & Office Care

Covered: Visits to any Medicare-accepting doctor (specialists don't require referrals unless you're in an HMO).

Cost: 20% copay after $257 annual deductible. The doctor's office bills the Medicare-approved amount, you pay 20% of that.

Preventive Services (100% Covered—No Copay)

Medicare Part B covers an extensive list of preventive services at 100%, no copay or deductible:

These preventive services are one of Medicare's best values. Use them. An annual wellness visit + colonoscopy every 10 years + mammogram/Pap test as recommended can catch problems early when they're most treatable.

Outpatient Hospital Services

Covered: Emergency room, urgent care visits, labs, imaging, outpatient surgery.

Cost: Varies. Emergency room may involve copays ($250–500 sometimes). Lab work and imaging: typically 20% copay after deductible.

Mental Health & Therapy Services

Covered: Psychiatry, therapy/counseling, behavioral health services.

Cost: 20% copay after deductible (same as doctor visits).

Note: Medicare covers behavioral health services, including substance abuse treatment. Many seniors underutilize mental health care because they don't know it's covered.

Physical Therapy, Occupational Therapy, Speech Therapy

Covered: PT, OT, ST in outpatient settings, home health, or skilled nursing facilities.

Cost: 20% copay after deductible.

Durable Medical Equipment (DME)

Covered items: Wheelchairs, walkers, canes, crutches, oxygen equipment, CPAP machines, hospital beds, blood glucose monitors, dialysis equipment.

Cost: 20% copay after deductible (or rental copay).

What Part B Does NOT Cover

• Routine dental, vision, hearing care: Cleanings, exams, fillings, root canals, glasses, contacts, hearing aids—all NOT COVERED. Standalone plans available but expensive.
• Cosmetic procedures: Facelifts, Botox, hair transplants. NOT COVERED.
• Routine eye exams or eyeglasses: NOT COVERED (though cataract surgery, glaucoma treatment, diabetic retinopathy screening are covered).
• Long-term care or custodial care: NOT COVERED by Part B (though sometimes by Part A SNF, with major limitations).

Real-World Example: The $6,200 Surprise

Medicare Part D: Prescription Drug Coverage

Part D covers prescription medications. Plans vary, but here's the framework:

How Part D Formularies Work (The Tier System)

Each Part D plan has a "formulary"—a list of covered drugs assigned to cost tiers. The tier determines your copay.

2026 Part D Cost Structure

• Monthly premium: $40–50/month on average (varies by plan and location)
• Annual deductible: Up to $560 (varies by plan; some have $0 deductible)
• Out-of-pocket spending cap: $2,000/year (2026). Once you hit $2,000 in out-of-pocket costs, Medicare covers 95% of remaining drug costs.

Part D Covered vs. Non-Covered Medications

Medicare Part D covers:

• Prescription medications
• Certain biologics (insulin, monoclonal antibodies)
• Injectable medications (some)

Medicare Part D does NOT cover:

• Over-the-counter medications (Tylenol, Advil, cold medicines, vitamins—with narrow exceptions)
• Medications not on the plan's formulary
• Drugs the FDA deemed do not meet Medicare coverage criteria
• Some medications for cosmetic use (e.g., Propecia for hair loss in some plans)

The Donut Hole (Mostly Solved)

Historically, Part D had a coverage gap called the "donut hole." Starting in 2025, this was nearly eliminated for most drugs. Once you reach $2,000 in out-of-pocket costs, you get 95% coverage for remaining drugs. This is a massive improvement.

How to Appeal a Drug Denial

If your plan denies coverage for a drug your doctor prescribed:

1. Ask about formulary exceptions: Your doctor can request a "formulary exception" or "prior authorization exception" from the plan.
2. Use the generic alternative: If available, the generic version of the drug is usually covered.
3. File a formal appeal: You have the right to appeal the plan's decision. Your doctor's support is critical here.

Common Medicare Coverage Misconceptions (Debunked)

Misconception 1: "Medicare covers hearing aids"

False. Hearing aids are NOT covered by any Medicare part, despite their proven medical benefit. Budget $2,000–6,000 out-of-pocket if you need them.

Misconception 2: "Medicare covers dental cleanings"

False. Dental care—cleanings, fillings, root canals, extractions—is NOT covered. Standalone dental plans are available through private insurers but have limited coverage and waiting periods.

Misconception 3: "Medicare covers long-term nursing home care"

False. Medicare covers only temporary skilled nursing (up to 100 days per benefit period after hospitalization). Long-term custodial care for non-medical assistance is NOT covered. This is perhaps the single largest retirement planning gap.

Misconception 4: "Medicare covers my annual physical"

Partially true. Medicare covers the annual "wellness visit" (preventive), but if your doctor also treats a chronic condition during that visit, you might owe copays for that portion. Make sure preventive vs. illness-related care is clearly separated.

Misconception 5: "I don't need Medigap because Medicare covers everything"

False. Medicare leaves significant gaps (20% copays, deductibles, no dental/vision/hearing). Medigap fills these gaps. Without it, you could face thousands in out-of-pocket costs per year.

The Bottom Line

Medicare Part A, B, and D cover a surprising amount—especially preventive care. But they also have major gaps: no dental, no hearing aids, no long-term custodial care, no vision. Understanding what's covered and what isn't lets you plan accordingly and avoid financial surprises.

Sources & References

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