Breaking Down Medicare's Four Parts
Medicare isn't a single, one-size-fits-all program — it's a collection of coverage options designed to address different healthcare needs. Understanding the four parts will help you build a coverage package that fits your situation and budget.
Medicare Part A: Hospital Insurance
Part A is often called "hospital insurance" because it covers care you receive as an inpatient. Specifically, Part A helps pay for:
- Inpatient hospital stays
- Skilled nursing facility (SNF) care following a qualifying hospital stay
- Hospice care for terminal illness
- Limited home health services
Cost: Most people pay no premium for Part A if they or their spouse worked and paid Medicare taxes for at least 10 years. There is, however, a deductible per benefit period and co-insurance for extended stays.
Medicare Part B: Medical Insurance
Part B covers outpatient and preventive care — the services you typically receive outside of a hospital. This includes:
- Doctor visits and specialist consultations
- Outpatient surgery and procedures
- Lab tests and X-rays
- Preventive screenings (mammograms, colonoscopies, flu shots, and more)
- Durable medical equipment (walkers, wheelchairs, etc.)
- Mental health services
Cost: Part B requires a monthly premium. The standard premium amount is set each year by CMS and is typically deducted from your Social Security benefit if you receive one. There is also an annual deductible, after which Medicare pays 80% of approved costs.
Medicare Part C: Medicare Advantage
Medicare Advantage is an alternative way to receive your Medicare benefits. Private insurance companies approved by Medicare offer these bundled plans, which must cover everything Original Medicare (Parts A and B) covers, and most include Part D drug coverage too.
Additional benefits often included in Medicare Advantage plans:
- Dental, vision, and hearing coverage
- Fitness memberships
- Transportation to medical appointments
- Over-the-counter allowances
Trade-off: Medicare Advantage plans typically use provider networks (HMO or PPO structures), meaning you may need referrals or be restricted to in-network doctors. Original Medicare, by contrast, lets you see any provider who accepts Medicare nationwide.
Medicare Part D: Prescription Drug Coverage
Part D adds prescription drug coverage to your Medicare benefits. It is offered exclusively through private insurers approved by Medicare. Key points:
- Available as a standalone Prescription Drug Plan (PDP) added to Original Medicare
- Also bundled into most Medicare Advantage plans (called MA-PD plans)
- Each plan has a formulary — a list of covered drugs organized into tiers that determine your cost-sharing
- Plans vary by premium, deductible, and drug coverage, so comparison shopping is important
Late enrollment penalty: If you go without creditable prescription drug coverage for 63 or more days after becoming eligible, you may owe a permanent penalty when you do enroll.
Original Medicare vs. Medicare Advantage: A Quick Comparison
| Feature | Original Medicare (A + B) | Medicare Advantage (Part C) |
|---|---|---|
| Provider choice | Any Medicare-accepting provider | Usually network-based |
| Referrals needed | No | Sometimes (HMO plans) |
| Extra benefits | Limited | Often includes dental, vision, hearing |
| Out-of-pocket maximum | No cap | Annual cap required by law |
| Drug coverage | Requires separate Part D | Usually included |
How to Choose
The right choice depends on your health needs, preferred doctors, prescription drugs, and budget. Consider these questions:
- Do your current doctors accept Medicare? Are they in any local Advantage plan networks?
- What medications do you take, and how are they covered under each plan option?
- How often do you travel or use out-of-network providers?
- Do you want extra benefits like dental or vision?
Reviewing the Medicare Plan Finder tool at Medicare.gov is a great starting point for comparing plans in your area.