Medicare, explained without a sales pitch

Original Medicare or Medicare Advantage? What happens to your Medigap options if you change your mind? Every fact here links to Medicare.gov, CMS, KFF or a state source. We do not sell plans.

Original Medicare vs Medicare AdvantageDoctor choice, costs, out-of-pocket limits, prior authorization and extra benefits, side by side, from Medicare.gov and KFF.The Medigap underwriting trap: switching back to Original MedicareWhy leaving Medicare Advantage can mean a Medigap denial, who is protected, and a checker for your situation.Medigap guaranteed issue rights (federal)The situations where an insurer must sell you a Medigap policy regardless of health, and the deadlines.Medigap birthday rules and guaranteed issue, state by stateWhich states let you switch Medigap policies or buy one without health questions, with a lookup by state.When you can switch Medicare plansAnnual Open Enrollment, the Medicare Advantage Open Enrollment Period, special enrollment periods and Medigap timing.Medicare costs in 2026Part A and Part B premiums and deductibles, hospital coinsurance and Medicare Advantage out-of-pocket limits, with sources.Medicare costs in 2027 (projected)The Trustees' projected 2027 Part B premium and deductible and Part A amounts, clearly marked until CMS announces the official figures.

The one thing most people miss

Medicare Advantage plans cannot turn you away because of your health. Medigap (Medicare Supplement) insurers generally can, outside a few protected periods. So the choice to join Medicare Advantage can be easy to make and hard to undo. Read the Medigap underwriting trap before you drop coverage.

Key facts for 2026

Details and sources are on the 2026 costs page. For help from a counselor, not a salesperson, call your free State Health Insurance Assistance Program (SHIP): find yours.

Common questions

Is this site selling Medicare plans?

No. We do not sell, rank or recommend any plan, and we do not collect your information. No insurer pays for placement.

Where do the facts come from?

Medicare.gov, CMS, KFF, KFF Health News, the NAIC and state insurance departments or SHIP programs. Each page lists its sources.

General information only. Medigap Atlas does not sell, recommend or enroll anyone in any plan, and is not affiliated with Medicare, CMS or any insurer. Rules and dates change and vary by state. Confirm your options with 1-800-MEDICARE (1-800-633-4227) or your State Health Insurance Assistance Program (SHIP) before you change coverage.

By James J. Updated October 2026. General information, not advice. See sources and method.