Access, decoded
Do all doctors take Medicare? Most do, and the exceptions come in three flavors
Short answer: the overwhelming majority of doctors treat Medicare patients, but "accepts Medicare" hides three distinct statuses with different bills. Participating doctors take Medicare’s rate as full payment. Non-participating doctors can charge up to 15% above it (the "excess charge"). Opted-out doctors, rare overall but concentrated in psychiatry and some specialties, work by private contract, and Medicare pays nothing. Learning to ask which one you’re booking is a two-minute skill that prevents genuine billing surprises.
Key takeaways
- Participating providers (the vast majority) accept Medicare’s approved amount as full payment: you owe only your normal deductible and 20%.
- Non-participating providers can bill up to 15% above the approved amount; Plan G covers excess charges, Plan N doesn’t, and eight states ban them.
- Opted-out providers contract privately: Medicare pays nothing, and you sign an agreement to pay their full fee.
- Advantage plans replace all of this with network logic: in-network, out-of-network, or not covered, per your plan’s rules.
- Verify anyone in 60 seconds: Medicare.gov’s provider search shows status, or ask the office the one precise question below.
The three statuses, in one table
| Status | What they can bill you | Your real cost |
|---|---|---|
| Participating ("accepts assignment") | Medicare’s approved amount, period | Deductible + 20% (which Medigap covers) |
| Non-participating | Up to 15% above the approved amount (the excess charge), banned in 8 states | Deductible + 20% + up to 15% excess (Plan G pays it; Plan N doesn’t) |
| Opted out | Whatever your private contract says | Everything; Medicare and Medigap pay $0 (true emergencies excepted) |
Excess charges are banned in NY, CT, MA, MN, OH, PA, RI, and VT. Opt-out requires the doctor to file with Medicare and contract with each patient.
The 15%, demystified
Non-participating doctors haven’t left Medicare; they’ve declined the participation agreement, which lets them charge up to 15% over the (slightly reduced) approved amount on unassigned claims. In practice: an approved amount of $200 can become a $230 bill, with the extra $30 yours. Three deflations of the fear, though: most doctors participate fully, eight states ban excess charges outright, and the charges are capped by law at that 15%, so the exposure is bounded, not open-ended. This is precisely the risk that separates Plan G from Plan N: G pays excess charges, N doesn’t, and the arithmetic there covers when that difference matters.
The opt-outs: rare, but clustered where it hurts
Fully opted-out physicians file an affidavit with Medicare and treat patients only under private contracts: you sign, you pay their fee, Medicare and your Medigap plan pay nothing, and no claim is even submitted. The overall opt-out rate is low single digits, but it clusters: psychiatry leads by a wide margin (one reason the mental-health article spends a section on finding clinicians), with pockets in plastic surgery, dermatology, and concierge primary care. The contract you sign is the tell; nobody opts you out by surprise, but people do sign without reading.
On Medicare Advantage, the question changes
Advantage replaces the assignment framework with networks: the question isn’t "does this doctor take Medicare" but "is this doctor in this plan’s network this year." A doctor can adore Original Medicare and be out-of-network for your specific plan, and directories overstate reality often enough that the gold standard is calling the office: "Are you in-network for [exact plan name] for 2026, and taking new patients?" Networks also change annually, which is one of the five September numbers in the ANOC ritual.
The 60-second verification, either path
- Original Medicare: search the provider at Medicare.gov (the care-comparison tools show whether a provider accepts assignment), or ask the office: "Do you accept Medicare assignment?" The word "assignment" signals you know the categories; the answer sorts them instantly.
- Advantage: the exact-plan-name network question above, asked of the office, not the directory.
- Any surprise bill: check the status first; a "Medicare denied this" letter from an opted-out or out-of-network encounter isn’t a coverage failure, it’s a category you can avoid next visit.
Questions people also ask
Do most doctors accept Medicare?
What does it mean when a doctor accepts Medicare assignment?
What are Medicare excess charges?
Can a doctor refuse Medicare completely?
How do I check if my doctor takes my Medicare Advantage plan?
Sources for this article
- Medicare.govMedicare.gov: provider search tools and assignment rules.
- Medicare.govMedigap basics: which plans cover excess charges.
- CMS.gov2026 premiums and deductibles: the cost-sharing baseline under assignment.
Figures checked against these sources in August 2026. We update within weeks when CMS publishes new amounts.
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