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Medicare Explained: Which Plan Is Right for You in 2026 (Parts A, B, C, D Simplified) | CHIVAM BLOGS
Medicare Explained: Which Plan Is Right for You in 2026 (Parts A, B, C, D Simplified)
Sivaram
Founder & Chief Editor
Published on
Last updated ·12 min read
Medicare confusion is genuine and costly. A 2021 Kaiser Family Foundation survey found that only 41% of Medicare beneficiaries correctly understood the basic differences between Advantage plans and Original Medicare. Yet the choice between Medicare Advantage and Original Medicare can mean thousands of dollars annually in out-of-pocket costs depending on your health situation.
This guide explains every component of Medicare in plain English — what each part covers, what it costs in 2026, enrollment timelines that cannot be missed without penalty, and a clear decision framework for choosing between Original Medicare and Medicare Advantage.
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Medicare enrollment has strict deadlines. Missing your Initial Enrollment Period can result in permanent premium surcharges (Part B late enrollment penalty: 10% per 12-month period you could have enrolled but didn't). This guide covers all deadlines.
Medicare Overview: The Four Parts
Medicare is the federal health insurance program for people 65 or older, certain disabled individuals under 65, and people with End-Stage Renal Disease. It is administered by the Centers for Medicare & Medicaid Services (CMS).
Official Medicare information and plan comparison tools are at medicare.gov — the only authoritative source for your specific plan options by ZIP code.
Part A: Hospital insurance — inpatient care, skilled nursing facility, hospice, some home health care
Part B: Medical insurance — doctor visits, outpatient care, preventive services, medical equipment
Part C (Medicare Advantage): Private insurance alternative that replaces Parts A and B, often including Part D
Part D: Prescription drug coverage — separate plan added to Original Medicare or included in Advantage plans
Part A: Hospital Insurance
What Part A Covers
Inpatient hospital stays
Skilled nursing facility care (after qualifying 3-day hospital stay)
Hospice care
Some home health services
What Part A Costs in 2026
Premium: Most people pay $0 — Part A is premium-free if you or your spouse worked and paid Medicare taxes for at least 40 quarters (10 years). If you have 30–39 quarters, the 2025 premium was $278/month; under 30 quarters, $505/month.
Deductible: $1,632 per benefit period (2025 figure — updated annually) for hospital stays. Important: this is per benefit period (not per year) — if you have multiple hospitalizations with breaks of 60+ days between them, you pay this deductible for each period.
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Coinsurance for long stays: Days 1–60 are covered (after deductible); days 61–90 require $408/day coinsurance; days 91+ use "lifetime reserve days" at $816/day. You have 60 lifetime reserve days total.
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Part A has significant gaps — particularly for extended hospital stays and skilled nursing facility care. These gaps are why Medigap supplement insurance or Medicare Advantage plans are important for most enrollees.
Preventive services (annual wellness visits, screenings, vaccines — most at 100%)
Lab tests and diagnostic imaging
Durable medical equipment (wheelchairs, walkers, etc.)
Mental health services
What Part B Costs in 2026
Standard premium: $202.90/month in 2026 (confirmed by CMS). Higher-income beneficiaries pay Income-Related Monthly Adjustment Amount (IRMAA) — up to $628.90/month for the highest income tier. Income from 2 years prior determines IRMAA.
Deductible: $257/year in 2026, then 20% coinsurance for most services after the deductible. There is no out-of-pocket maximum in Original Medicare (Part A + B) — this unlimited exposure is a key reason for purchasing a Medigap plan.
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Preventive services: Part B covers annual wellness visits, cancer screenings, diabetes screenings, cardiovascular screenings, depression screenings, and vaccines (flu, pneumococcal, COVID-19) at 100% with no cost sharing. Take full advantage of these.
Part D: Prescription Drug Coverage
Part D is prescription drug insurance offered by private companies approved by Medicare. Without Part D, medications are entirely out-of-pocket. The standard Part D structure includes a deductible ($590 in 2026), initial coverage, and catastrophic coverage.
A significant 2024 Inflation Reduction Act change: starting 2025, Part D out-of-pocket costs are capped at $2,000/year for all Medicare beneficiaries. This eliminated the previous "donut hole" coverage gap that caused beneficiaries to pay full drug costs in a middle coverage tier.
Monthly premium: $0–$150+ depending on plan and income (IRMAA applies)
Annual deductible: Up to $590 in 2026 (some plans have lower or no deductible)
Out-of-pocket cap: $2,000/year (new in 2025, permanent change)
Compare Part D plans in your area at medicare.gov/plan-compare. Enter your specific medications to see formulary coverage and total annual cost estimates.
Medigap (Medicare Supplement Insurance)
Original Medicare covers approximately 80% of approved healthcare costs — leaving you responsible for the remaining 20% with no out-of-pocket maximum. Medigap plans are private insurance policies that fill these gaps.
Standardized plans: Medigap plans are standardized across insurers (labeled Plan A, B, C, D, F, G, K, L, M, N). Plan G is the most comprehensive available to new enrollees (Plan F was closed to new enrollees starting 2020) and covers: Part A coinsurance, Part B coinsurance (20%), Part A deductible, Part A hospice coinsurance, skilled nursing coinsurance, and up to 365 additional inpatient hospital days.
Plan G: ~$120–250/month for a 65-year-old, covers nearly all gaps in Original Medicare
Plan N: Lower premium than G, but with Part B copays ($20 office visits, $50 ER)
Plan K/L: Cover 50–75% of gaps — lower premium, higher exposure
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Best enrollment window for Medigap: During your 6-month Medigap Open Enrollment Period starting when you are 65 and enrolled in Part B, insurers cannot deny coverage or charge higher rates based on pre-existing conditions. Outside this window, medical underwriting applies in most states.
Medicare Advantage (Part C): The Alternative Path
Medicare Advantage plans are offered by private insurers approved by Medicare. They must cover everything Original Medicare covers, and most include Part D drug coverage. Many offer additional benefits: dental, vision, hearing, gym memberships, and wellness programs — benefits not covered by Original Medicare.
As of 2025, 54% of Medicare beneficiaries are enrolled in Medicare Advantage plans, surpassing Original Medicare enrollment for the first time. Part of this is due to the additional benefits. Part of it is aggressive marketing that does not always clearly explain trade-offs.
Medicare Advantage Trade-offs
Network restrictions: Most Advantage plans are HMO or PPO — you must use in-network providers. Seeing out-of-network specialists typically requires referrals or results in higher costs.
Prior authorization requirements: Advantage plans can require prior approval for procedures, hospitalizations, and specialist referrals that Original Medicare does not require.
Annual plan changes: Benefits, premiums, and formularies change each year. A plan that works well this year may be less favorable next year.
Harder to switch: Once enrolled in Advantage, returning to Original Medicare plus a Medigap plan is difficult — you lose the Medigap open enrollment protections and may be denied coverage due to pre-existing conditions in most states.
When Advantage Makes Sense
You are relatively healthy and rarely need specialist or out-of-network care
The additional benefits (dental, vision, hearing) are valuable to your situation
The out-of-pocket maximum ($9,250 in-network maximum for 2026) provides a cap you want
The plan's network includes your current doctors
Original Medicare vs. Medicare Advantage: Decision Framework
Choose Original Medicare + Medigap + Part D if:
You have existing relationships with specialists you want to maintain
You travel frequently or spend time in multiple states
You have serious chronic conditions requiring frequent specialist care
You want predictable costs and no prior authorization requirements
You can afford the Medigap premium ($150–300/month)
Consider Medicare Advantage if:
You are relatively healthy with minimal specialist needs
The additional benefits (dental, vision) are important to you
The plan's network covers your preferred doctors
The lower premium (many $0 premium Advantage plans exist) matters to your budget
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Never switch to Medicare Advantage solely because it has a $0 premium. The $0 premium is offset by copays, coinsurance, and network restrictions. Calculate total expected annual cost including premiums, deductibles, and typical cost-sharing — not just the premium.
Medicare Enrollment Timeline: Every Deadline You Need to Know
Initial Enrollment Period (IEP)
A 7-month window: 3 months before your 65th birthday month, your birthday month itself, and 3 months after. Enrolling in Part B on time prevents late enrollment penalties. If you are still working at 65 with employer insurance, you may be able to delay enrollment without penalty — specific rules apply.
Special Enrollment Period (SEP)
If you have creditable employer coverage at 65, you can delay Part B without penalty and enroll during an 8-month SEP after employer coverage ends. Creditable coverage means your employer plan covers as much as Medicare — most large employer plans qualify.
General Enrollment Period (GEP)
January 1 – March 31 each year — for people who missed their IEP and are not eligible for a SEP. Coverage starts July 1. Late enrollment penalties apply.
Part B Late Enrollment Penalty
10% premium surcharge for each 12-month period you could have had Part B but didn't. This is permanent — it stays for as long as you have Part B. Someone who delayed enrollment for 3 years pays 30% more than the standard premium indefinitely.
Frequently Asked Questions
Can I have both Medicare Advantage and a Medigap plan?
No. Medigap plans cannot be used with Medicare Advantage. Medigap only works alongside Original Medicare (Part A and Part B). If you choose Advantage, you cannot purchase a Medigap supplement.
What does Medicare not cover?
Original Medicare does not cover: routine dental care (cleanings, fillings, dentures), routine vision care (eye exams, glasses), hearing aids, long-term custodial care (nursing home care for daily living activities), and most care outside the US. These are significant coverage gaps — plan accordingly.
How do I appeal a Medicare coverage denial?
CMS provides a formal appeals process for denied claims. Every denial notice must include instructions for filing an appeal. You have 120 days from the denial date to file. Medicare's official appeals guidance is at medicare.gov/claims-appeals.
Is Medicare free?
Part A is usually free (premium-free if you paid Medicare taxes for 10+ years). Part B charges $202.90/month in 2026. Part D adds $0–150+/month. Medigap adds another $120–300/month. Total monthly cost for Original Medicare + Medigap Plan G + Part D: approximately $400–650 for most 65-year-olds, depending on location and plan choices.
Getting Help Choosing: Free Resources
You are not required to navigate this alone. Several free resources provide unbiased guidance:
SHIP (State Health Insurance Assistance Program): Free counseling from trained volunteers in every state. Find your local SHIP at shiphelp.org. This is the most underused free Medicare resource available.
Medicare Plan Finder: Compare all plans available in your ZIP code with cost estimates at medicare.gov/plan-compare.
Medicare helpline: 1-800-MEDICARE (1-800-633-4227) — 24/7 information from CMS.
The Bottom Line
The Medicare decision framework is: (1) Enroll during your Initial Enrollment Period to avoid permanent premium penalties; (2) If you want the most flexibility and coverage, choose Original Medicare + Medigap Plan G + Part D; (3) If additional benefits and lower premiums matter more than network flexibility, evaluate Medicare Advantage plans carefully by comparing total annual costs, not just premiums; (4) Use SHIP counselors or the Medicare Plan Finder for personalized guidance at no cost.
The most important thing is not to miss enrollment windows — the late enrollment penalty for Part B is permanent and costly. Put your 65th birthday enrollment period in your calendar years in advance.
