The most important health coverage decision most Americans ever make happens at age 65, usually under time pressure and with incomplete information. Medicare Advantage looks cheaper upfront β and it often is, until you get seriously sick. This guide explains every path, what the numbers actually mean, and the critical window most seniors don’t know they only get once.
When a senior turns 65 and enrolls in Medicare, they face a choice that most people don’t realize has long-term consequences. The four main paths are: Original Medicare alone (Parts A & B β no cap on what you could owe, no drug coverage), Original Medicare + Medigap + Part D (comprehensive, predictable, expensive in premiums but often cheaper when sick), Medicare Advantage (Part C) (replaces Original Medicare, often $0 premium, bundled drugs and extras, network-restricted), and Medicare Advantage + Part D included (most common MA plan type, convenience of one plan). The Part B premium of $202.90/month in 2026 is paid on top of any plan you choose β it is not optional for most beneficiaries. Understanding these paths before choosing is the entire ballgame.
The most important facts about senior health plans, answered plainly. Each is covered in more depth below.
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What is the best health insurance plan for seniors? Original Medicare + Medigap Plan G: best for predictable costs and no network restrictions Β· Medicare Advantage: best for lower monthly costs when healthy Β· Neither is universally “best” β it depends on how much care you useThe honest answer is that “best” depends entirely on your health situation, your doctors, and how much risk you can absorb financially. For seniors with chronic conditions, multiple specialists, or high annual healthcare use, Original Medicare plus a Medigap Plan G typically wins on total annual cost β even though premiums run $120β$180/month for Plan G on top of the $202.90 Part B premium. Once you pay the $283 Part B deductible, Plan G covers essentially everything Medicare approves, with no co-pays, no networks, and no prior authorization. For seniors in good health who rarely use the healthcare system, Medicare Advantage plans β averaging $14/month in added premium nationally β can be genuinely less expensive over years when no serious illness occurs. The critical caveat: if a serious illness hits and your Medicare Advantage plan requires prior authorization that gets delayed or denied, the out-of-pocket consequences can be severe. The out-of-pocket maximum on MA plans runs up to around $9,350 in-network for 2026.
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Why do people say Medicare Advantage plans are bad? Prior authorization delays and denials for medically necessary care Β· Narrower networks (not all doctors accept your plan) Β· Out-of-pocket maximum up to ~$9,350 in-network Β· Hospitals dropping MA contracts in 2026 Β· Benefits can change year to yearThe criticism of Medicare Advantage is specific and has substantial federal backing. A Department of Health and Human Services Office of Inspector General report found that 13% of prior-authorization denials by MA plans actually met the clinical coverage rules of traditional Medicare β meaning care that should have been approved was rejected. An AMA survey found 91% of physicians reported that prior authorization delays led to negative patient outcomes. In 2026, prior-authorization denial rates jumped 56% over prior-year levels, and new federal rules were required specifically to force faster responses. Separately, hospital systems in multiple states are ending their MA contracts because the plans pay less than Original Medicare for identical services and deny claims at higher rates. For a relatively healthy senior, these issues may be invisible. For a senior who needs surgery, extended rehabilitation, chemotherapy, or complex specialist care, the additional friction of prior authorization, network limits, and potential denials can translate directly into delayed care, surprise bills, and out-of-pocket costs approaching the plan’s annual maximum.
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What does Medicare Part B cost in 2026? Standard Part B premium: $202.90/month Β· Part B deductible: $283/year Β· Higher-income seniors pay more (IRMAA surcharges) Β· This premium is paid regardless of whether you have Medicare Advantage or Original MedicareMedicare Part B β which covers doctor visits, outpatient care, and preventive services β costs $202.90/month for most beneficiaries in 2026, up significantly from $185/month in 2025. This is not optional if you are enrolled in Medicare, and it applies whether you chose Medicare Advantage or Original Medicare. Seniors with higher income pay an Income-Related Monthly Adjustment Amount (IRMAA) surcharge on top of the standard premium, ranging from an additional $74.00 to $443.90/month depending on their 2024 tax return income. The Part B annual deductible is $283 in 2026. The Part A hospital deductible is $1,736 per benefit period. IRMAA thresholds begin at individual income above $106,000 (or married joint income above $212,000) from two years prior. If your income decreased significantly due to retirement or another life event, you can appeal the IRMAA amount using Form SSA-44.
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What does a Medigap Plan G cover and is it worth the cost? Plan G covers: Part A deductible ($1,736), all Part A and B coinsurance, skilled nursing facility coinsurance, Part B excess charges, foreign travel emergency Β· Does NOT cover: Part B deductible ($283/year) Β· Worth it: yes, for anyone who expects to use healthcare regularlyMedigap Plan G is the most comprehensive supplement available to new Medicare enrollees (Plan F, which covered the Part B deductible too, closed to new enrollees in 2020). After you pay the $283 Part B deductible once per year, Plan G covers every other approved Medicare cost β every Part A and B co-insurance charge, every hospital stay without limit, skilled nursing facility care, and even emergency coverage in foreign countries. The financial case: Plan G premiums run $120β$180/month for a 65-year-old, which is $1,440β$2,160 per year. The hospital deductible alone ($1,736) exceeds a full year of Plan G premiums at the low end. A single hospital admission without Plan G can cost $1,736 plus daily coinsurance. A skilled nursing facility stay can cost hundreds per day without coverage. For seniors with even moderate healthcare use, Plan G frequently pays for itself in the first hospitalization. The key trade-off is paying consistent monthly premiums during years you’re healthy in exchange for near-zero out-of-pocket costs when you’re not.
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What are the 4 types of Medicare plans? Part A: hospital insurance Β· Part B: medical insurance (doctors, outpatient) Β· Part C: Medicare Advantage (private insurance alternative bundling A+B+usually D) Β· Part D: prescription drug coverage Β· Medigap is supplemental insurance added on top of original Parts A & BMedicare is structured in four official parts. Part A covers inpatient hospital care, skilled nursing facilities, hospice, and some home health care β most people receive it premium-free if they worked and paid Medicare taxes for 10+ years. Part B covers outpatient medical services: doctor visits, preventive care, lab tests, durable medical equipment, and some home health care β standard premium $202.90/month in 2026. Part C is Medicare Advantage, which is sold by private insurers and bundles Part A and Part B coverage through the insurer’s network, often adding Part D drug coverage and extras like dental and vision. Part D provides standalone prescription drug coverage for those on Original Medicare who don’t get drugs through a Part C plan. Medigap (Medicare Supplement) is not a “part” of Medicare β it’s private insurance that fills the cost gaps left by Parts A and B. You can only have either Medicare Advantage or Medigap β not both simultaneously.
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Is there a health plan that covers everything for seniors? Closest option: Original Medicare + Medigap Plan G + Part D Β· Covers nearly all Medicare-approved medical costs, most hospital costs, prescription drugs Β· Does NOT cover: long-term custodial care (nursing home), dental, vision, hearing, most cosmetic proceduresNo Medicare plan covers everything β but Original Medicare with a Medigap Plan G supplement and a Part D drug plan comes closest to comprehensive coverage for Medicare-approved services. After your $283 Part B deductible, you essentially have no out-of-pocket costs for any Medicare-covered medical service for the rest of the year. The significant gaps that remain are the same for all Medicare paths: long-term custodial nursing home care (most expensive and most often misunderstood β Medicare only covers skilled nursing for up to 100 days, not the indefinite stays most people imagine), routine dental care, routine vision care, and hearing aids. Medicare Advantage plans often include dental, vision, and hearing benefits that Original Medicare lacks, which is a genuine advantage for healthy seniors who prioritize those extras. But those benefits typically have annual limits ($500β$4,000 for dental depending on the plan) and are subject to the plan’s network restrictions.
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Does health insurance cover thyroid conditions for seniors? Yes β thyroid conditions are covered under Medicare Parts A and B Β· Thyroid blood tests (TSH, T4): covered as preventive care Β· Thyroid medication: covered under Part D Β· Thyroid ultrasound: covered if medically necessary Β· Thyroid surgery: covered under Part AThyroid conditions β including hypothyroidism, hyperthyroidism, thyroid nodules, and thyroid cancer β are among the most common conditions in older adults, affecting an estimated 20% of women over 60. Under Original Medicare and Medicare Advantage plans, thyroid care is covered broadly. Thyroid-stimulating hormone (TSH) blood tests ordered by a physician as medically necessary are covered under Part B (20% coinsurance after deductible with Original Medicare, or per-plan copay with Medicare Advantage). Thyroid medications β levothyroxine (Synthroid) being one of the most commonly prescribed drugs in the country β are covered under Part D plans, typically as a Tier 1 or Tier 2 generic at very low copays. Thyroid ultrasound is covered when ordered for a clinical reason. Thyroid surgery is covered under Part A if inpatient or Part B if outpatient. Annual wellness visits, which are free under Medicare, include thyroid assessment. If you are already managing a thyroid condition, check that your specific thyroid medications are on your chosen Part D formulary before enrolling.
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Can I switch from Medicare Advantage back to Original Medicare? Yes β during Annual Enrollment Period (Oct 15 β Dec 7) or Medicare Advantage Open Enrollment (Jan 1 β Mar 31) Β· Critical warning: switching back at older ages may mean you can no longer qualify for Medigap due to health conditions (most states allow underwriting)Switching from Medicare Advantage back to Original Medicare is technically straightforward β you can do it annually during the Annual Enrollment Period (October 15βDecember 7) or during the Medicare Advantage Open Enrollment Period (January 1βMarch 31). Coverage changes take effect January 1 and February 1, respectively. The serious complication: if you want to add a Medigap supplement when returning to Original Medicare, most states allow insurers to deny you or charge dramatically higher premiums based on your current health conditions β a process called medical underwriting. Only Connecticut, Massachusetts, New York, and (starting August 2026) Minnesota require insurers to accept all applicants regardless of health. Everyone else has a single guaranteed-issue window at age 65. A 72-year-old who was enrolled in Medicare Advantage for seven years and now wants to switch to Original Medicare plus Plan G may be denied by every Medigap insurer in their state if they have diabetes, heart disease, or other chronic conditions. This is why the decision at age 65 carries so much long-term weight.
All beneficiaries pay the Part B premium ($202.90/month in 2026) regardless of the path chosen. Costs shown below are in addition to Part B unless noted.
| Plan Path | Added Monthly Cost | Out-of-Pocket Risk | Network | Best For |
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| Original Medicare Only (A+B) | $0 addedJust the $202.90 Part B premium Β· No drug coverage | Unlimited β no annual cap | Any doctor who accepts Medicare | Not recommended alone β no out-of-pocket ceiling puts you at serious financial risk |
| Original Medicare + Medigap Plan G + Part D Most Comprehensive | $120β$180/mo Plan G+ Part D ($8β$62/mo) Β· Total added: ~$128β$242/mo | ~$283/year after Part B deductible β then nearly $0 | Any Medicare-accepting provider nationwide β no referrals, no prior auth | Seniors with chronic conditions, frequent healthcare use, travel, or anyone wanting zero financial surprises |
| Original Medicare + Medigap Plan N + Part D | $90β$130/mo Plan N+ Part D Β· Copays: $20 at doctor, $50 at ER | Very low β modest copays for office visits | Any Medicare-accepting provider nationwide | Healthy seniors who want Medigap protection at lower premiums and can absorb small copays |
| Medicare Advantage HMO (Part C) Network Required | $0β$30/mo avgNational avg added premium ~$14/mo Β· Often $0 Β· Part D usually included | Up to ~$9,350 in-network annually | Restricted to plan’s HMO network Β· Referrals required for specialists | Relatively healthy seniors comfortable with network restrictions who want low premiums and bundled extras |
| Medicare Advantage PPO (Part C) More Flexibility | $0β$80/mo avgSlightly higher than HMO Β· Out-of-network coverage at higher cost | ~$9,350 in-network Β· Higher out-of-network | Preferred network but out-of-network at higher cost | Seniors wanting Advantage cost savings with more provider flexibility than an HMO allows |
| Dual-Eligible Special Needs Plan (D-SNP) | Often $0For seniors with both Medicare and Medicaid Β· Comprehensive benefit coordination | Very low β Medicaid covers most cost-sharing | Plan-specific network | Seniors qualifying for both Medicare and Medicaid Β· Coordinates coverage between both programs |
- Part B premium (2026): $202.90/month β paid by everyone on Medicare
- Part A hospital deductible: $1,736 per benefit period β covered by Medigap Plan G
- Part B annual deductible: $283 β NOT covered by Plan G, but covered by now-unavailable Plan F
- Medicare Advantage max out-of-pocket: up to ~$9,350 in-network β you pay 100% of costs until you hit this ceiling
- Medigap open enrollment window: 6 months starting the month you turn 65 AND have Part B β this guaranteed-issue window is irreversible
Free, unbiased Medicare counseling is available through SHIP (State Health Insurance Assistance Program) counselors in every state. Use the buttons below to find local help, doctors who accept Medicare, and community health resources.
- Step 1 β Know your window: If you’re within 6 months of turning 65 and enrolling in Part B, you’re in the Medigap guaranteed-issue period. This is irreversible. Understand both Medicare Advantage and Medigap before making this choice β you may only truly get one shot at Medigap with no health questions.
- Step 2 β Check your doctors: Before choosing any plan, call your primary care doctor and key specialists and ask: “Do you accept [this plan]?” For Medicare Advantage, confirm your doctors are in-network. For Medigap, confirm they accept Original Medicare. Never rely solely on the plan’s online directory.
- Step 3 β Run your drug list: Go to medicare.gov/plan-compare and enter every prescription you take. This tool shows your total estimated annual cost including premiums and all drug expenses for every plan available in your ZIP code. The lowest premium is almost never the lowest total cost.
- Step 4 β Review every September: Plans change coverage, networks, and premiums annually. Read your Annual Notice of Change letter the moment it arrives in September. If your doctors, drugs, or costs changed significantly, the Annual Enrollment Period (October 15βDecember 7) is your chance to switch.
- Step 5 β Get free help: SHIP counselors at shiphelp.org provide free, unbiased Medicare counseling in every state β they have no financial interest in what you choose. Call 1-800-MEDICARE for official information 24 hours a day, 7 days a week.
Medicare plan details, premiums, deductibles, out-of-pocket limits, and availability change annually and vary by ZIP code. All figures cited reflect 2026 CMS-published data as of the most recent update. Medigap guaranteed-issue rules vary by state β confirm your specific state’s rules at medicare.gov or with a SHIP counselor. This content is for informational purposes only and is not a substitute for professional Medicare counseling or licensed insurance advice. This page has no affiliation with Medicare, CMS, or any insurance carrier mentioned.