Complete Guide to Medicare Coverage for Seniors: Parts A, B, C, D Explained
Everything You Need to Know About Medicare
Medicare can be confusing. This complete guide explains all four parts, what they cover, costs, enrollment deadlines, and how to avoid penalties. Updated for 2026 with the latest coverage rules.
⚡ Quick Facts
- Eligibility: Age 65+ or under 65 with disability
- Enrollment Window: 7 months (3 months before 65th birthday + birth month + 3 after)
- Late Enrollment Penalty: 10% increase per year for Part B, varies for Part D
- Annual Changes: October 15 - December 7 (Open Enrollment)
🔷 Part A: Hospital Insurance
What It Covers:
- Hospital stays (inpatient)
- Skilled nursing facility care (limited)
- Hospice care
- Some home health care
Most people: $0 premium (if you or spouse paid Medicare taxes 10+ years)
Deductible: $1,632 per benefit period
Coinsurance: $0 days 1-60, $408/day days 61-90
- Long-term nursing home care
- Private room (unless medically necessary)
- Personal care items
🔷 Part B: Medical Insurance
What It Covers:
- Doctor visits
- Outpatient care
- Preventive services (annual wellness, vaccines, screenings)
- Medical equipment (wheelchairs, walkers, oxygen)
- Ambulance services
- Mental health services
Standard premium: $174.70/month
Deductible: $240/year
Coinsurance: 20% of Medicare-approved amount
- Annual wellness visit
- Flu shots, pneumonia vaccine
- Mammograms, colonoscopies
- Depression screening
- Diabetes screening
🔷 Part C: Medicare Advantage
What It Is: Private insurance plans that REPLACE Parts A & B (and often include Part D)
✓ Advantages
- Often includes dental, vision, hearing
- Out-of-pocket maximum ($8,850 in 2026)
- May include gym membership, OTC allowance
- One card for everything
✗ Disadvantages
- Network restrictions (HMO/PPO)
- Referrals may be required
- Can't use with Medigap
- Plans change yearly
$0-$200/month (PLUS you still pay Part B premium $174.70)
Copays vary by plan: $0-50 doctor visits, $300-500 hospital stays
🔷 Part D: Prescription Drug Coverage
What It Covers: Prescription medications (must enroll in separate plan)
Premium: $35-100/month (varies by plan)
Deductible: Up to $545/year
Copays: $0-47 generic, $0-100+ brand
After $5,030 in total drug costs, you enter the gap. In 2026: You pay 25% for covered drugs until you reach $8,000 out-of-pocket, then catastrophic coverage kicks in (5% or $4.15/$10.35 per drug).
⏰ Important Enrollment Deadlines
7-month window: 3 months before your 65th birthday + your birth month + 3 months after
October 15 - December 7 every year. Change plans, switch to/from Advantage, add/drop Part D.
Qualify if you move, lose employer coverage, or other life changes. Usually 2 months to enroll.
💸 Late Enrollment Penalties
⚠️ Penalties last FOREVER. Enroll on time!
🤔 Medicare Advantage vs Original Medicare + Medigap
| Feature | Medicare Advantage | Original + Medigap |
|---|---|---|
| Monthly Cost | $174.70 + $0-200 | $174.70 + $100-300 |
| Extras | Often includes dental, vision | Must buy separately |
| Provider Choice | Network only (HMO/PPO) | Any doctor accepting Medicare |
| Travel Coverage | Limited outside network | Nationwide coverage |
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