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What Each Medicare Plan Covers - A Clear 2026 Guide

Choosing Medicare is easier when you know what each part actually covers.

In this guide, you’ll learn who qualifies, what each Medicare plan covers, how to compare your options, and the exact steps to pick the right plan for your health and budget.

Do you qualify for Medicare?

Most people become eligible at 65 if they’re U.S. citizens or permanent residents who have lived in the U.S. for at least five continuous years. Younger individuals can also qualify if they’ve received SSDI benefits for 24 months or have End-Stage Renal Disease (ESRD) or ALS. If you or your spouse paid Medicare taxes long enough, Part A is often premium-free; Part B and Part D usually have monthly premiums.

Your enrollment timing matters. The Initial Enrollment Period surrounds your 65th birthday, and you may qualify for Special Enrollment Periods if you’re still working and covered by employer insurance or experience certain life events. If you miss these windows, you may need to wait for the General Enrollment Period and could face late penalties.

How to check quickly: Review eligibility basics on Medicare.gov, read Social Security’s Medicare page at SSA.gov, and confirm your timing using Medicare’s guide to eligibility and when to sign up. For sign-up windows, see the Initial Enrollment Period, General Enrollment Period, and Special Enrollment Periods. You can enroll through Social Security online, by phone, or in person.

What Medicare actually covers (by part)

Part A (Hospital Insurance)

Part A helps cover inpatient hospital care, limited skilled nursing facility (SNF) care after a qualifying hospital stay, hospice, and some home health. Learn more about inpatient care, SNF, and hospice at Medicare.gov: inpatient hospital care, SNF care, and hospice care.

  • Typically covered: Room and board in a hospital, limited SNF stays, hospice for terminal illness, some home health following an inpatient stay.
  • Not routine: Private-duty nursing, personal/custodial long-term care, most non-medical services.

Part B (Medical Insurance)

Part B covers doctor visits, outpatient services, preventive care, lab tests, imaging, mental health outpatient services, and durable medical equipment (DME). See what Part B covers and DME details: What Part B covers and DME coverage.

  • Cost sharing: After the annual Part B deductible, beneficiaries typically pay 20% coinsurance for most covered services. Providers who accept Medicare assignment agree to Medicare’s approved amount as full payment (learn more about assignment here).
  • Preventive services: Many screenings and vaccinations are covered with no cost when you meet Medicare’s criteria.

Part D (Prescription Drug Coverage)

Part D plans (from private insurers) help pay for outpatient prescription drugs. Each plan has a formulary with drug tiers, preferred pharmacies, and coverage rules (like prior authorization). Details at Medicare Part D.

  • Costs vary: Premiums, deductibles, copays/coinsurance, and pharmacy networks differ by plan and county.
  • Coverage stages: Part D has standardized phases during the year; your out-of-pocket costs change by stage. Bring your drug list to the Plan Finder to see real costs.

Medicare Advantage (Part C)

Medicare Advantage plans bundle Parts A and B and often include Part D, plus extras like dental, vision, hearing, fitness, or over-the-counter allowances. You’ll generally use a provider network (HMO, PPO, etc.), and many services require referrals or prior authorization. Explore options at Medicare Advantage.

  • Out-of-pocket maximum: Advantage plans include an annual limit on your costs for Part A and B services when you stay in-network.
  • Trade-offs: Lower premiums and extras vs. network rules and utilization management.

Medigap (Medicare Supplement Insurance)

Medigap isn’t a Medicare “part,” but private policies that help pay Original Medicare’s deductibles, coinsurance, and copays. Plans are standardized in most states (labeled A–N). You cannot use Medigap with Medicare Advantage. Learn more at Medigap.

  • When to buy: You get a six-month Medigap open enrollment window starting the month your Part B begins, when you can buy any plan sold in your state without medical underwriting.
  • Prescription drugs: Medigap doesn’t include drug coverage; pair it with a standalone Part D plan if needed.

Comparison chart: Original Medicare vs. Advantage vs. Part D vs. Medigap

  • Keep any doctor who takes Medicare? Original Medicare: Yes. Medicare Advantage: Usually network-based (HMO/PPO rules). Part D: N/A. Medigap: Works only with Original Medicare.
  • Prescription drugs included? Original Medicare: No (add Part D). Medicare Advantage: Often yes. Part D: Yes. Medigap: No.
  • Extras (dental/vision/hearing/fitness)? Original Medicare: Limited medical necessity only. Advantage: Often includes extras. Part D: Drug-only. Medigap: Generally none.
  • Referrals/prior authorization? Original Medicare: Rare. Advantage: Common. Part D: Utilization rules apply to certain medications. Medigap: N/A.
  • Out-of-pocket maximum? Original Medicare: No annual cap. Advantage: Yes, plan-specific cap for Parts A & B. Part D: Catastrophic protections apply. Medigap: Helps cover Original Medicare cost-sharing.
  • Travel flexibility (U.S.)? Original Medicare: National acceptance. Advantage: Varies; emergencies always covered, routine care usually in-network. Medigap: Follows Original Medicare. Part D: National pharmacy networks vary by plan.
  • Travel outside the U.S.? Original Medicare: Generally not covered; some Medigap plans include limited foreign travel emergency. See Medicare’s travel page: travel coverage.

Key things to know before you compare

  • Enrollment windows drive your options. Learn the Initial, Special, and General Enrollment Periods—and the Annual Open Enrollment (Oct 15–Dec 7) and Medicare Advantage Open Enrollment (Jan 1–Mar 31).
  • Late penalties can be permanent. If you delay Part B or Part D without qualifying coverage, you may pay higher premiums for as long as you have Medicare.
  • Network rules matter. Advantage plans can deliver lower costs and extras, but out-of-network care can be limited or pricier.
  • Original Medicare has no out-of-pocket cap. Consider Medigap to manage unpredictable costs.
  • Lower-income help exists. Apply for Part D Extra Help at SSA.gov, and check Medicaid or Medicare Savings Programs via Medicaid.gov.
  • Appeals are your right. If a service or drug is denied, you can appeal. Start at Medicare claims & appeals.

How to choose the right Medicare plan (step-by-step)

  1. List your must-haves: Doctors, hospitals, preferred pharmacies, and all prescriptions (dosage and frequency).
  2. Decide flexibility vs. extras: If seeing any Medicare-participating provider and nationwide portability are key, Original Medicare + Medigap may fit. If you want lower premiums and added benefits, compare Medicare Advantage HMOs/PPOs.
  3. Estimate your total annual cost: Don’t fixate on premiums. Add deductibles, copays/coinsurance, and likely utilization. Use the Medicare Plan Finder to price your drugs and see in-network providers.
  4. Check networks and rules: For Advantage, verify your doctors and hospitals are in-network and note prior authorization and referral requirements. For Part D, confirm your meds are on formulary and what tier they’re on.
  5. Review quality and service: Look at star ratings and member experience in Plan Finder, and read plan documents (Summary of Benefits, Evidence of Coverage).
  6. Know your Medigap timing: Your six-month Medigap open enrollment window after Part B starts is the easiest time to buy. Outside that, underwriting may apply depending on your state.
  7. Get free, unbiased help: Contact your local State Health Insurance Assistance Program (SHIP) at SHIPhelp.org for one-on-one counseling.
  8. Enroll on time: Apply for Parts A and B via Social Security. Enroll in Medicare Advantage or Part D through the plan, the insurer, or the Plan Finder.

Common coverage questions

  • Does Medicare cover dental, vision, and hearing? Original Medicare generally doesn’t cover routine dental, routine vision, or hearing aids. Some Advantage plans include these extras. See specific coverage for dental, vision exams, and hearing aids.
  • Does Medicare pay for long-term care? Medicare doesn’t cover custodial long-term care (help with bathing, dressing, eating) in most situations. It does cover medically necessary skilled care for limited periods. Learn more at long-term care coverage.
  • Can I keep my employer coverage? Possibly. Many delay Part B if they have active, creditable employer coverage. Confirm with your benefits administrator to avoid penalties and gaps.

Quick scenarios to guide your decision

  • You want maximum provider choice and travel freedom: Consider Original Medicare + Medigap + Part D. You can see any provider who takes Medicare nationwide and protect yourself from high cost-sharing.
  • You value low premiums and extras: Compare Medicare Advantage HMOs/PPOs with your doctors and drugs in-network. Check the plan’s out-of-pocket max and rules for referrals/authorizations.
  • You take multiple brand-name meds: Run your list in the Plan Finder. Favor plans that place your drugs on lower tiers and include your pharmacy as preferred.
  • Your budget is tight: Look for $0-premium Advantage plans that still meet your needs, and apply for Extra Help at SSA.gov. Also check Medicaid eligibility at Medicaid.gov.

Bottom line

Original Medicare, Medicare Advantage, Part D, and Medigap each solve different problems. Start with eligibility and timing, map your providers and prescriptions, compare true annual costs and rules, and use trusted resources like Medicare.gov, Social Security, and the Plan Finder to choose confidently.