Medicare Provider Networks: How to Keep Your Doctor

Older man asking about doctor plan coverage

A Medicare provider network is the group of doctors, hospitals and other providers that a Medicare Advantage plan has contracted with to care for its members. Original Medicare works differently. It has no network, so you can see any provider in the country who accepts Medicare. If keeping your current doctor matters to you, the steps are simple: find out which type of coverage you have or are considering, check each doctor against that plan, and confirm again by phone when you book.

This guide explains the difference in plain language. It also shows how to look up your doctors, what happens when one is out of network, and what to do if a plan’s directory turns out to be wrong.

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TL;DR

Original Medicare has no network. You can use any doctor or hospital in the U.S. that accepts Medicare, and it is smart to confirm the provider accepts assignment.
Medicare Advantage plans use networks. Whether you can go out of network, and what it costs, depends on the plan type (HMO, PPO, PFFS and others).
Check a doctor in the plan’s provider directory or in Medicare Plan Finder, then call the office to confirm. Directories are not always accurate, and providers can leave a network at any time.
Emergency and urgent care are covered even if the provider or hospital is not in your network.
If your doctor leaves, your plan should make a good-faith effort to give at least 30 days’ notice when you see that provider regularly.

What a Medicare provider network actually is
Original Medicare: any doctor who accepts Medicare
Medicare Advantage: in-network, out-of-network and plan types
How to find out if your doctor is covered
Verify before you book, every time
What to do if your doctor leaves the network or the directory was wrong
Choosing a plan around the doctors you want to keep
Let us check your doctors against your options
FAQ
Sources

What a Medicare provider network actually is

The word “network” causes most of the confusion, so start with the definition. The American Medical Association describes an in-network provider as one that has a contract with your plan. An out-of-network provider has no such contract. Those contracts set the rates the plan pays and often the rules you follow, such as seeing a primary care doctor first.

The same AMA brief names provider networks and cost sharing as the two practical differences that shape your experience when you compare Original Medicare with Medicare Advantage. In other words, “Will my doctor be covered?” is one of the two biggest questions to settle before you choose.

Networks exist because plans use them to manage cost and quality. MedPAC, the agency that advises Congress on Medicare, notes that networks can support those goals while plans must still provide adequate access to the full range of required Medicare benefits. For you, that means a network is a trade: a defined set of providers in exchange for the plan’s structure and benefits. Your job is to make sure the providers you rely on are inside it.

What a Medicare provider network actually is

Original Medicare: any doctor who accepts Medicare

With Original Medicare (Part A and Part B), you can use any doctor or hospital that accepts Medicare, anywhere in the United States. You also don’t usually need a referral to see a specialist. That is why people who travel a lot, split the year between two states, or see specialists at far-away hospitals often look closely at Original Medicare.

The one detail to know is assignment.

What “accepts assignment” means for your costs

According to the official Your Medicare Benefits guide, Part B covers medically necessary doctor services and many preventive services. In 2026, after the $283 Part B deductible, you typically pay 20% of the Medicare-approved amount when the provider accepts assignment.

Assignment means the provider agrees to take Medicare’s approved amount as payment in full, submits the claim to Medicare, and bills you only the deductible and coinsurance. A provider who does not accept assignment may charge up to 15% above the approved amount for most Part B services. CMS says most doctors and suppliers do accept assignment, but you should still ask.

Medicare assignment costs compared side by side

A simple question at the front desk handles this: “Do you accept Medicare assignment?” The same guide notes that accepting assignment generally lowers your out-of-pocket costs.

One more point from the AMA brief: Original Medicare generally has 20% Part B coinsurance after the deductible and no annual out-of-pocket limit unless you add supplemental coverage. Many people pair Original Medicare with a Medicare Supplement (Medigap) policy for that reason. Our guide to how Medicare Advantage and Medicare Supplement differ walks through that choice.

Medicare Advantage: in-network, out-of-network and plan types

Medicare Advantage (Part C) plans are offered by private insurers that contract with Medicare. Medicare.gov explains that these plans may require you to use providers in the plan’s network and service area for non-emergency care. Some plans cover non-emergency out-of-network care at a higher cost. Medicare Advantage may also require a referral to see a specialist.

The rules depend on the plan type. Medicare’s own booklet on understanding your Medicare Advantage plan’s provider network describes how each one works:

Plan type	Out-of-network care	What to know
HMO	Generally limited to emergencies, out-of-area urgent care and temporary out-of-area dialysis	Non-emergency care usually must come from network providers
HMO point-of-service	Some out-of-network care may be allowed	Usually costs more than in-network care
PPO	Generally allowed	You usually pay more
PFFS	Only if the provider accepts the plan’s payment terms	Not every provider has to accept them

Your plan’s Evidence of Coverage is the final word on your own rules. As one example of how an HMO rule reads, a 2026 Kaiser Permanente Evidence of Coverage says routine care from an unauthorized out-of-network provider generally is not covered and may be payable in full by the member. It lists exceptions for emergencies, urgently needed care, authorized out-of-network specialty care and certain dialysis.

Emergencies and gaps in the network

Two protections are worth knowing:

Medicare.gov says emergency and urgent care are available even if the provider or hospital isn’t in your network.
Federal rules for coordinated-care Medicare Advantage plans require adequate networks. Under 42 CFR § 422.112, when an in-network provider or benefit is unavailable or inadequate, the plan must arrange the medically necessary covered benefit outside the network at in-network cost sharing.

If you think your plan’s network can’t meet a specific medical need, call the plan first and ask how it handles that situation. Your doctor’s office can often help with the request.

Costs matter alongside networks. Medicare Advantage plans have plan-specific cost sharing and an annual limit on what you pay for covered Part A and Part B services, according to the AMA. Our articles on what you actually pay with Medicare Advantage and what the out-of-pocket cap leaves out show how to read those numbers.

How to find out if your doctor is covered

The right method depends on your coverage.

If you have or want Original Medicare

Ask the office whether the doctor accepts Medicare and, specifically, whether they accept assignment.
Use Medicare’s provider comparison tools on Medicare.gov to find providers near you.
If you are adding a Medigap policy, remember that it works alongside Original Medicare, so the same any-provider-that-accepts-Medicare rule applies. Ask a licensed agent how a specific policy handles your situation.

If you have or want Medicare Advantage

Use Medicare Plan Finder. KFF reports that you can enter up to five providers or mark a must-have provider when comparing Medicare Advantage plans. KFF also advises verifying the result with the plan because networks can change.
Open the plan’s provider directory. Medicare.gov says you can find the directory on the plan’s website or request one from the plan.
Check hospitals and specialists too. Your primary care doctor may be in network while the hospital you prefer, your cardiologist or your physical therapy clinic may not be. Look up each one.
Check the exact plan name. A carrier often sells several plans in the same county, and each can have a different network. Confirm the doctor participates in the specific plan, not just with the company.
Call the office. Ask, “Are you in network with this exact plan name?” Have the plan’s name ready.

If you have a long list of providers, write them down with their addresses before you start. It takes ten minutes and saves a lot of backtracking.

Verify before you book, every time

A directory listing is a starting point, not a guarantee. CMS advises checking the plan’s provider directory and calling the insurer if a provider is missing, because directories are not always accurate. CMS adds that an explanation of benefits can show whether care was billed as in network or out of network.

Medicare.gov also reminds members that a Medicare Advantage provider can leave the network at any time, so it recommends calling the doctor’s office when you schedule to confirm they’re still in your plan’s network. Make that a habit for:

New appointments with a new specialist
Scheduled surgeries, imaging and procedures
The start of a new plan year
Any time you receive a letter from your plan about network changes

Write down the date and the name of the person you spoke with. If a bill later conflicts with what you were told, you will have a record to share with the plan.

What to do if your doctor leaves the network or the directory was wrong

Networks change. If a provider you see leaves, Medicare.gov says you should choose a new provider in your plan’s network, and the plan should make a good-faith effort to give you at least 30 days’ notice when you use that provider regularly.

Here is a practical order of steps:

Call your plan and ask when the change takes effect and whether you can finish a current course of treatment with that provider.
Ask your doctor’s office whether they can recommend in-network colleagues or tell you what other plans they accept.
Look at your enrollment options. Your ability to switch plans depends on timing. Our guide on how to change Medicare plans and when you can lays out the windows.

A temporary safeguard for incorrect directory information

Wrong network data has real consequences, and CMS has responded. For 2026, guidance summarized by the Illinois Department on Aging describes a temporary Special Enrollment Period. It may help people who enrolled in a Medicare Advantage plan through Medicare Plan Finder and found within the first three months that a preferred doctor was not actually in network. The person must call 1-800-MEDICARE. The Medicare Rights Center reports the safeguard was created for people misled by incorrect Plan Finder provider information.

Because this is a temporary rule tied to specific plan dates, call 1-800-MEDICARE or your State Health Insurance Assistance Program to ask what applies to you now. Don’t wait: the time limits are short.

Looking ahead, regulators are also requiring Medicare Advantage plans to share their provider directories directly with Medicare Plan Finder, which is meant to improve the accuracy of what you see when you shop.

Choosing a plan around the doctors you want to keep

When doctors are your priority, build your search around them from the start, not at the end:

List your must-keep providers. Include your primary care doctor, specialists, your preferred hospital and any regular therapy or dialysis provider.
List your prescriptions. Your drugs affect which plan is best, and a plan can be great for your doctors but not for your medications. A Part D prescription review covers that side.
Decide how much flexibility you want. If you travel often or want any-provider freedom, Original Medicare with a Supplement is one path. If you are comfortable with a network in exchange for plan benefits, Medicare Advantage may fit. Neither is right for everyone.
Think about where you live. If you spend part of the year elsewhere or may relocate, read our guide to moving states with Medicare, since networks are tied to service areas.
Recheck every year. Plans can change their networks and costs from one year to the next, so an annual review keeps surprises away.

Let us check your doctors against your options

If you live in Northern Illinois or Southern Wisconsin, we can do the matching for you. At Almond Insurance, we compare Medicare Advantage, Medicare Supplement and Part D plans, and we look at which of your doctors and hospitals each option works with. We explain the results in plain language, with no jargon. We also offer annual coverage reviews so your plan keeps fitting your care. Caregivers helping a parent or spouse are welcome to ask questions too.

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Start with our Medicare plan comparison help or browse everything we offer on our services page. If you are turning 65, our new-to-Medicare guidance walks you through each step. You can also read more about Medicare Advantage guidance or start with Medicare 101.

FAQ

Can I keep my doctor if I switch to Medicare Advantage?

Only if your doctor is in the network of the specific plan you choose, or if your plan type allows out-of-network care and you accept the higher cost. Look the doctor up in Medicare Plan Finder and the plan’s directory, then call the office to confirm. Do this before you enroll.

Do all doctors accept Medicare?

Most do, according to CMS, but not every provider accepts assignment. A provider who does not accept assignment can charge up to 15% above the Medicare-approved amount for most Part B services. Ask the office whether it accepts assignment before your visit.

What happens if I see an out-of-network doctor on Medicare Advantage?

It depends on your plan. HMO plans generally don’t cover non-emergency out-of-network care. PPO plans usually allow it at a higher cost. Emergency and urgent care are covered even when the provider is not in your network.

How do I know if my doctor is still in network?

Check the plan’s current provider directory, then call the doctor’s office when you schedule to confirm they still participate in your plan. Providers can leave a network at any time, and directories are not always accurate.

Do I need a referral to see a specialist?

Original Medicare usually doesn’t require a referral. Medicare Advantage plans may. Check your plan’s rules before you book with a specialist, since skipping a required referral can affect what the plan pays.

Medicare Provider Networks: How to Keep Your Doctor