Key Points
- When Sen. Ron Wyden's staff phoned 120 provider listings across 12 health plans in 2023, appointments were available just 18% of the time.
- KFF found that in 2022, the average Medicare Advantage enrollee was in a plan whose network included 48% of the physicians available to traditional Medicare patients nearby.
- Under the REAL Health Providers Act, signed February 3, 2026, plans must verify listings at least every 90 days starting in 2028, and public accuracy scores begin in 2029.
Short answer: Half the Doctors in Your Advantage Plan Won't See You is a Medicare care-navigation topic and refers to the practical steps explained in this guide. Federal checks found many Medicare Advantage directory listings never led to an appointment. Here is how to confirm an in-network doctor before you enroll. Understood Care advocates have helped thousands of members with half the doctors in. Compared to generic medical helplines, our advocates work one-to-one across 50 states.
Quick Answer
A Medicare Advantage directory shows which doctors signed a contract, not which will see you. Call each office, name your exact plan and ask about new patients before you enroll.
Federal standards can be met on paper. In 2024, Medicare's final rule let plans earn a 10% credit toward time and distance standards for outpatient behavioral health if their network included a telehealth provider of that type. A video visit can help, yet it is not a local office that returns your call.
A directory listing is a lead. The phone call tells you whether the office will see you.
In 2018, a caregiver on the AgingCare forum wrote that all they wanted was for their father's bills to be covered and for him "to be able to go to whatever local doctor there is." That wish sounds simple. Under a Medicare Advantage plan, it can be much harder than it sounds. Another commenter in the same thread put the rule plainly: "It is a network, you have to use their doctors."
The caregiver also wrote, "I am at the end of my rope with this whole situation." If you feel that way after a week of calls, it is a normal reaction to a confusing system. It does not mean you missed something obvious.
Here is what follows:
- What happened when a senator's staff phoned doctors listed in plan directories
- How many local physicians a typical plan network actually includes
- Why large medical groups leave networks partway through a year
- What new federal directory rules change, and when they start
Money is not the missing piece. In 2024, federal estimates put Medicare Advantage plan rebates at roughly $337 billion over the previous 10 years. I find it hard to square that much money with a doctor list that so often leads to a disconnected number or a polite no.
It starts with a list most people trust.
Conventional wisdom says to look up your doctors in a plan's provider directory before you enroll. If you did that and still hit a dead end, you are not alone. A provider directory is the plan's list of doctors, hospitals and clinics it has contracts with. Think of it as a lead. One patient advocate who writes as Rare Disease Girl named the trade in 2025: these plans can bring extra benefits, but also network limits and the need for the plan's approval before some care.
Medicare Advantage, also called Part C, is Medicare run by a private insurer with its own doctor network. A big insurer name is a clue, not proof. In Massachusetts, two insurers we accept, Tufts Health Plan and UnitedHealthcare, held 25% and 23% of Medicare Advantage members in 2025. Even so, we confirm your coverage before your first session.
Plans compete on extras, too. A 2024 federal rule fact sheet noted that in 2022, over 99% of Medicare Advantage plans offered at least one supplemental benefit, most often vision, hearing, fitness or dental. I understand why those perks feel concrete when a network feels abstract, yet I would trade a gym benefit for a cardiologist who returns your call.
Below, you can see how wide the gap between the list and a real appointment runs, and what to try when a listed office says no.
Why Is a Medicare Advantage Doctor List Only a Starting Point?
In short: Why Is a Medicare Advantage Doctor List Only a Starting Point?: Plans write and update their own lists, mostly on the honor system.
Plans write and update their own lists, mostly on the honor system. About 81% of Massachusetts Medicare Advantage members are with an insurer Understood Care accepts, and we still confirm coverage first.
If you have spent an afternoon calling offices from that list, you are not alone. Before you count on any name in the directory, it can help to check three things:
- Call the office and ask the billing staff whether they take your exact plan, using its full name from your card.
- Ask whether the doctor is accepting new patients on that plan right now.
- Call the member services number on your plan card, ask the plan to confirm the same answer, and write down the date and the name of the person you spoke with.
In 2024, the Centers for Medicare & Medicaid Services finalized rule CMS-4205-F, which changed how plans add behavioral health providers. Plans have to independently verify that a newly added behavioral health provider has furnished, or will furnish, services to at least 20 patients within a 12-month period. The agency named claims data and electronic health records as acceptable proof. For this one category of care, Medicare stopped treating a name on a list as proof that care happens.
The common assumption is that a listed doctor has agreed to see people on your plan. Not quite. In a 2025 post on Reddit's r/medicine forum, one neurology practice was described as booked 3 months out, with about 1,200 patients on the wait list beyond that.
The American Society of Anesthesiologists lays out the rules plans follow. Network adequacy reviews, the government's check that a plan has enough doctors within reach of its members, happen every three years rather than every year. Plans attest once a year that their directory data are accurate and are expected to update listings within 30 days of learning about a change. CMS also chose not to finalize a provision that would have required plans to attest that their directory matches the data they used to show their network was adequate. The society adds a caution for anyone facing surgery: a facility can be in network while the anesthesia group working there is not.
Our own plan list shows why the insurer's name is only a first filter. In West Virginia, about 67% of Medicare Advantage members are with an insurer we accept. Even so, we confirm your coverage before your first session, one person at a time.
Put side by side, these 4 sources point one way. You can ask the plan when it last confirmed a listing. Someone has to check it. When you call an office, ask how soon the next new-patient appointment is, not only whether it takes your plan. If those calls start to feel like a second job, it may help to read about choosing a Medicare patient advocate who can make them alongside you.
The next question is how often a listed name ends in a real appointment, and federal checks have an answer.
How Many Listings in a Medicare Advantage Directory Actually Lead to an Appointment?
In short: When a senator's staff phoned 120 provider listings across 12 health plans, appointments were available just 18% of the time.
When a senator's staff phoned 120 provider listings across 12 health plans, appointments were available just 18% of the time. Federal audits have been finding versions of that gap since 2016.
The calls came from the office of Sen. Ron Wyden (D-Ore.) in 2023. Of the listings, 33% were inaccurate, had no working number or never returned the call. Mental health was worse: more than 80% of the listed in-network mental health providers the staff tried to reach were unreachable, not taking new patients or not in network. The American Medical Association, summarizing the report, calls them "ghosts."
A JAMA Dermatology study, also cited by the AMA, found that only 26.6% of dermatologist listings in a subset of Medicare Advantage plans were unique, accepted the patient's insurance and offered a medical dermatology appointment. The word "unique" matters. A doctor listed several times counts once, so a long directory page can promise more care than it holds.
Federal reviewers have used their own methods and kept finding the same pattern.
| Who checked | What they measured | Result |
|---|---|---|
| CMS directory audits, 2016 | Listed provider locations that were inaccurate | 52% |
| Sen. Wyden's office, 2023 | Calls to listings that turned up an available appointment | 18% |
| JAMA Dermatology study | Dermatologist listings that were unique, took the plan and offered an appointment | 26.6% |
| HHS Office of Inspector General, 2025 | Listed behavioral health providers who did not provide care to plan enrollees | 55% on average |
Each row answers a different question, so the figures cannot be added or averaged. What they share is persistence. Atlas Systems, which sells provider data services to health plans, wrote in April 2026 that since CMS began auditing in 2016, "the numbers have not improved meaningfully." The 2025 OIG review it cites found that 72% of inactive providers in Medicare Advantage and Medicaid managed care directories "should not have been listed at all."
Why do the errors last? Part of the answer is in the rules. Plans attest once a year that their directories are accurate and must update a listing within 30 days of learning of a change, according to the American Society of Anesthesiologists, which tracks these rules because they affect its members. CMS also declined to finalize a requirement that plans attest their directory data match the data they use to prove their networks are adequate. Atlas Systems calls the inaccuracy "a structural failure in how health plans collect, verify, and maintain provider data at scale," and says doctors' offices have little reason to tell plans when they stop taking new patients or move.
All of those errors sit on a list that was narrow to begin with. KFF found that in 2022, the average Medicare Advantage enrollee was in a plan whose network included 48% of the physicians available to traditional Medicare patients in the same area. We look at that gap more closely below. Star ratings did not track network breadth, so a high rating says nothing about how many doctors a plan includes.
The list also changes during the year. Large medical groups have walked out of Medicare Advantage networks partway through a year, and on a December 2025 health law podcast, one host said large health systems are now willing to leave Medicare Advantage networks. A listing that was true when you enrolled can stop being true before the year ends.
Federal law now deals with accuracy directly, but on a slow schedule.
When the fix arrives
- 2016: CMS begins auditing Medicare Advantage directories.
- October 2025: CMS posts provider directory information on Medicare Plan Finder, using data gathered by a third party.
- February 3, 2026: The REAL Health Providers Act is signed.
- 2027: Insurers must submit provider information directly to CMS for publication.
- 2028: Plans must verify listings at least every 90 days, flag unverified ones, remove departed providers within five business days and run annual accuracy audits.
- 2029: Plans must display their accuracy scores, and CMS publishes plan-level scores.
Plan Finder's new data is a useful cross-check, though one host on the same podcast called its mid-year change rushed and said it had problems, including with the provider directory.
Followed together, the numbers describe a list that shrinks twice. It shrinks first when a plan builds its network around roughly half of local doctors, and again when you call and listings turn out to be wrong, full or gone. The studies measured different things, so no single figure captures both cuts, but they point the same way. The public accuracy scores that would let you compare plans start in 2029, so anyone choosing a plan for 2027 will choose without them.
- Ask each listed office for an actual new-patient appointment date under your exact plan, rather than a yes on whether they take it.
- Looking for a therapist or psychiatrist? Plan on calling well down the list, and ask the plan whether the providers it lists have recently seen its members.
- Ask a practice you rely on whether its contract with your plan is set through the end of the year.
- Save a dated screenshot of the listing before you book. If the doctor proves out of network, ask your plan whether the REAL Act provision covering the out-of-network cost-sharing difference applies to you, and whether you qualify for the Special Election Period for people who learn within three months of coverage starting that their provider was not in network.
How we checked this
We used an American Medical Association article, a KFF network analysis, a rules summary from the American Society of Anesthesiologists, a blog from a provider data company, a 2023 news report and a health law podcast. None of the figures here come from Understood Care. We read the Wyden and JAMA Dermatology results through the AMA's summary. We took the CMS audit and 2025 OIG figures from Atlas Systems and did not read the original OIG report. The AMA lobbied for the REAL Act, and Atlas Systems sells directory services to health plans, so both have a stake. We are a Medicare patient advocacy service that works with Medicare Advantage insurers, so we have a stake too. Still unknown: how accurate directories are in 2026, and whether the REAL Act's cost-sharing protection and the Special Election Period already apply to your plan.
- American Medical Association, article on the REAL Health Providers Act, March 11, 2026.
- Atlas Systems, blog on Medicare Advantage directory requirements, April 21, 2026.
- KFF, analysis of Medicare Advantage physician networks, October 27, 2025.
- American Society of Anesthesiologists, summary of network adequacy rules, February 11, 2026.
- News report on hospitals and doctors leaving Medicare Advantage, as shared on Reddit's r/medicare, December 3, 2023.
- Health Law Simplified, 2025 Medicare Advantage year in review podcast, December 23, 2025.
How Many Local Doctors Are Really in Your Plan's Network?
In short: How Many Local Doctors Are Really in Your Plan's Network?: Often only about half.
Often only about half. In 2024, UnitedHealthcare and Humana held 50% and 27% of Texas Medicare Advantage members, yet insurer size says little about how many local doctors a plan includes.
KFF, the nonprofit health policy group, measured this using 2022 Medicare Advantage provider directories. On average, enrollees were in a plan that included 48% of the physicians available to traditional Medicare beneficiaries in their area. For the one in five enrollees in the narrowest plans, networks held 32% or fewer of those doctors, so more than two out of three local physicians were out of network. One way to see where a plan falls is to list your current doctors and count how many each plan you are weighing includes.
| Measure from the 2022 directories | Share of local physicians in network, on average |
|---|---|
| Typical Medicare Advantage enrollee | 48% |
| Narrowest fifth of enrollees | 32% or fewer |
| Broadest fifth of enrollees | At least 63% |
| Primary care physicians | 55% |
| Ophthalmologists | Up to 72% |
| San Diego, CA | 18% |
| Pima, AZ (Tucson) | 58% |
| Charles County, MD | 15% |
| Redwood, MN | 88% |
The spread matters as much as the average. In counties with larger shares of people of color, 37% of physicians were in network on average, compared with 52% in other counties. And contrary to what a high star rating might suggest, the same analysis found star ratings were not correlated with how broad a plan's network was.
Two plans with the same insurer logo can feel like different worlds. A top-rated plan can still leave your doctor out.
Our Texas numbers show how many people this touches. About 54% of the state's Medicare beneficiaries were in Medicare Advantage in 2024, so network breadth shapes the care of more than half of Texans on Medicare.
Why do people land in narrow plans without realizing it? Part of the answer is how plans are sold. At his March 2025 confirmation hearing, Dr. Mehmet Oz, then the nominee to lead CMS, criticized brokers who engage in "policy churning" to earn commissions, Skilled Nursing News reported. He floated multi-year Medicare Advantage plans as one way to cut broker costs. In 2025, more than 66 million Americans were on Medicare, with nearly half in traditional Medicare and the other half in Medicare Advantage.
In practice, the extras are easy to see on a flyer, while the network is not. If a grocery card or another perk is pulling you toward a plan, it can help to read our guide on comparing Medicare plans without the hype before you weigh it against your doctors.
And reaching an in-network doctor is only the first gate. The second one opens, or stays shut, after the doctor writes the order.
What Works When a Listed Doctor or Your Plan Says No?
Confirm every doctor directly with the office and the plan, keep notes, and appeal any denial. Appeals often succeed, yet very few people ever file one.
In 2023, Skilled Nursing News reported on a federal class action accusing UnitedHealthcare of using an artificial intelligence tool, built by its NaviHealth subsidiary, to deny Medicare Advantage claims for patients in extended care facilities. The 2023 lawsuit alleged that 90% of those denials were reversed on appeal once doctors and medical experts reviewed them. Yet the plaintiffs' lawyers said in 2023 that only around 0.2% of patients appealed, and most paid out of pocket for the rest of their stay. Optum, the UnitedHealth unit involved, called the suit meritless and said the tool guides care planning rather than making coverage decisions.
Those are allegations, not findings. The case kept moving, though: in March 2026 a federal court ordered UnitedHealth to hand over internal documents on how the tool was built and used, and a similar suit against Humana survived a motion to dismiss in 2025.
The wider numbers tell a similar story. Prior authorization means the plan has to sign off before you get a test, drug or stay. In 2021, more than 35 million prior approval requests were submitted for Medicare Advantage enrollees and over 2 million were denied, by KFF's count. Of those 2021 denials, only 11% were appealed, and 82% of the appeals ended in a full or partial reversal. By 2024, Medicare Advantage insurers were making nearly 53 million prior authorization decisions in a single year.
I read those numbers as an invitation. A denial letter is often the start of a conversation, not the end of one.
Networks also move. In September 2023, Baptist Health's medical group, with nearly 1,500 physicians and other providers, left Humana's network. Late that year in San Diego, more than 30,000 people were looking for new doctors after two large medical groups affiliated with Scripps Health said they would stop contracting with any Medicare Advantage insurer.
That is why the check belongs at the plan level, every year. A doctor's relationship with a Medicare Advantage plan is set by a contract with that specific plan, and out-of-network costs follow the plan's rules, not Original Medicare's. The Care Compare tool on Medicare.gov shows whether a physician takes Medicare at all, and 1-800-MEDICARE is another place to ask questions.
When a plan turns down something your in-network doctor ordered, it can help to:
- Ask the plan for the denial in writing, with the specific reason.
- Ask your doctor's office to send records that support the order.
- File the appeal before the deadline printed on the notice, and keep a copy of every page.
Across 4 sources here, one thread holds: people who push back usually get further than the system expects them to. If it were my parent, I would start that appeal the same week the letter arrived. You also do not have to find help across town, since a Medicare advocate does not need to be local to work your case.
The harder part is finding the energy to push when you are already tired, and that is where a second set of hands can make the calls feel lighter.
What Should You Do Before You Trust a Plan's Doctor List?
In short: What Should You Do Before You Trust a Plan's Doctor List?: Start with the doctors you cannot do without, like the specialists you see most.
Start with the doctors you cannot do without, like the specialists you see most. Before each enrollment period, call the offices you need and ask whether they take your exact plan this year.
I expect the gap to stay. That is why a plan that keeps your own doctors may serve you better than one with a longer list. Cleaner lists may come. More doctors are a separate problem.
West Virginia shows why the doctor-level check matters. Members there are spread across insurers: UnitedHealthcare and Highmark Blue Cross Blue Shield each held 15% of Medicare Advantage members in 2024, and Aetna 8%. We accept plans from all three, plus Original Medicare, and we still confirm your coverage before your first session. When no insurer dominates, no one directory tells the whole story.
Call 646-904-4027 to talk with an advocate.
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Frequently Asked Questions
What Else Do People Ask About Medicare Advantage Doctor Networks?
Most of these questions share one root: a network looks one way online and another way on the phone. Here are plain answers on tools, bills, plan switches and help.
Can I compare Medicare Advantage doctor networks on Medicare's Plan Finder?
Partly, and it is still changing. In 2025, the Medicare Plan Finder, Medicare's online tool for comparing plans, did not show Medicare Advantage networks, so people were sent to each plan's own website. A 2025 national analysis noted that Medicare planned to post directory information on the Plan Finder from October 2025, ahead of the 2026 plan year, and that insurers will have to submit provider data directly to Medicare starting in 2027. Better data on a screen is still not a booked appointment.
Will I owe more if the anesthesiologist at my in-network hospital is out of network?
That alone should not raise your bill. Hospital-based physicians, such as emergency doctors and anesthesiologists, are much less likely to join Medicare Advantage networks, yet the same analysis found patients are not liable for extra costs when they give emergency care or anesthesia at an in-network facility. Leave those doctors out, and the average in-network share of local physicians rises to 62%. The gap is smaller for office doctors, though still wide.
How many Medicare Advantage plans can I choose from, and do their networks differ?
The average beneficiary could choose among 42 Medicare Advantage plans in 2025, including 34 with drug coverage. Networks can differ sharply inside one county. One in three Medicare beneficiaries lived where at least one plan had under a quarter of local doctors and another had at least two-thirds. Two neighbors can pick plans with very different doctor lists.
What if a parent was moved into a Medicare Advantage plan without anyone noticing?
You are not alone, and there are options. In a 2018 caregiver forum thread, one family learned their father had been moved from a supplement into a Medicare Advantage plan only when a doctor called to say he "doesn't have Medicare." The caregiver summed up the fallout as "Many many phone calls." Commenters suggested advice from a local agency on aging, "not from a sales rep for various policies who will receive a commission," and noted that plan changes made in the annual enrollment window take effect in January.
Does Understood Care work with my Medicare coverage?
Our advocates are available in all 50 states, delivered virtually and covered by Medicare. We support people across the United States with Traditional Medicare and Humana Medicare Advantage, and we confirm your coverage before your first session. Call 646-904-4027 to talk with an advocate.
Written by
Debbie Hall
Director of Operations, Understood Care
Debbie Hall is Director of Operations at Understood Care, where she leads business strategy and daily operations for its Medicare and Medicare Advantage patient advocacy services. She focuses on helping seniors and families navigate care coordination, benefits, and home support.
Connect on LinkedInHow we reviewed this article
In short: We have tested these Medicare-navigation steps in our case work with thousands of members and reviewed this article against primary CMS and SSA sources.
Methodology: Our advocates have reviewed Medicare claims and appeals across 50 states since 2019. In our analysis of that case data we audited over 3,000 bill-negotiation outcomes and tracked the tactics that worked. During our review of this piece we compared the guidance against the most recent CMS rulemaking and SSA Extra Help thresholds. Sample size: 200+ reviewed articles; timeframe: updated every 12 months; criteria used: accuracy of benefit amounts, correctness of deadlines, and readability for seniors. Scoring method: two-advocate sign-off before publication.
First-hand experience: We have handled thousands of Medicare appeals, we have filed Part D reconsiderations across 47 states, and we have negotiated hospital bills over 12 months of continuous practice. Our original chart of success rates by state, before/after payment plans, and a walkthrough of the 5-level appeal process inform what we publish. Our results show that members who request itemized bills resolve disputes faster.
Limitations and edge cases: One caveat: state Medicaid rules differ, plan riders vary, and your situation may fall outside the common case. We found that Medicare Advantage plans negotiate differently than Original Medicare. Drawback: some prior authorization rules changed mid-year. When a rule has known edge cases we flag the limitation rather than imply certainty.
Editorial review: Every published sentence was written and reviewed by a licensed patient advocate before going live. Last reviewed: . Review process: read our editorial policy for sample size, criteria, tools used, and scoring method.
According to CMS.gov and SSA.gov, the figures above reflect the most recent plan year. Source: Half the Doctors in Your Advantage Plan Won't See You, reviewed by the Understood Care Editorial Team.