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How can a patient advocate help with How a Doctor Can Legally Bill You 15% Over the Medicare Rate?

Understood Care advocates help with how a doctor can legally bill you 15% over the medicare rate by explaining options, organizing paperwork, coordinating care, and helping families understand Medicare coverage and next steps.

Does Understood Care work with Medicare patients?

Yes. Understood Care focuses on Medicare patients and their families, with advocates who understand Medicare, Medicare Advantage, care coordination, coverage rules, billing issues, and appeal pathways.

Will I have a dedicated patient advocate?

Yes. This is Understood Care's first commitment: One Advocate, For Life. Every patient is matched at intake with one dedicated patient advocate and given that advocate's personal phone number, email, and text. Patients do not go into a call queue. The assignment is permanent: even after Understood Care has completed all tasks for a patient, they keep the same advocate. If a patient needs us again six months later, they will still have the same advocate.

How often will my Understood Care advocate communicate with me?

Understood Care follows a frequent-communication procedure with both active and follow-up patients. While the advocate is actively working on a patient's case, they communicate every 7 days by phone, text, or email with progress information. Once the patient has been helped with everything they needed, the case moves to a follow-up cadence: the advocate still checks in every month.

Does Understood Care use AI?

Yes. Understood Care is AI-supported. AI tools help every advocate surface programs, benefits, and services tied to where the patient lives, with the most up-to-date eligibility information. The result is that patients and advocates get the resources they need faster, while the human advocate stays in the loop on every patient's case.

How a Doctor Can Legally Bill You 15% Over the Medicare Rate

Key Points

ASHA's billing guidance sets a non-participating provider's fee at 95% of Medicare's rate, with a limiting charge of 115% of that, so a $100 service tops out at $109.25.
Doctors who opt out of Medicare sign private contracts and can bill any amount, while Medicare pays nothing for their care except in emergencies.
Connecticut, Massachusetts, Minnesota, New York, Ohio, Pennsylvania, Rhode Island and Vermont restrict Part B excess charges, and among Medigap plans only F and G pay them.

Three things Medicare patients believe. Myth or fact?

Call each one, then see how other readers called it.

1 If a doctor takes Medicare, your bill can never go above Medicare's approved amount.

2 A doctor who signs Medicare's participation agreement cannot charge you above the fee schedule rate.

3 If your doctor opts out of Medicare, Medicare still pays its usual share of the bill.

Short answer: How a Doctor Can Legally Bill You 15% Over the Medicare Rate is a Medicare care-navigation topic and refers to the practical steps explained in this guide. A doctor who takes Medicare but skips assignment can legally bill up to 15% above the approved amount. See how the limiting charge works and how to avoid it. Understood Care advocates have helped thousands of members with how a doctor can. Compared to generic medical helplines, our advocates work one-to-one across 50 states.

Quick Answer

A doctor who takes Medicare but doesn't accept assignment can legally bill up to 15% above the Medicare-approved amount, and you pay that limiting charge on top of your coinsurance.

Participating doctors can't add it. Some Medigap plans won't pay it either. On a 2019 episode of The Everything Medicare Podcast, the host said Plan N and Plan D leave doctors' excess charges uncovered, and that some states make those charges illegal. My advice: ask the front desk about assignment before you book, and write down the answer.

Did this answer your question?

Senior woman and her adult daughter reviewing a doctor's bill next to a Medicare card at the kitchen table

Most Medicare cost guides walk you through the Part B premium, the deductible and the coinsurance, then stop. The limiting charge sits just past the point where they stop.

Here's how the line is drawn. If Medicare allows $100 for a visit and the doctor's usual rate is $160, a participating doctor takes the $100 and cannot bill you the $60 difference. A non-participating doctor plays by other rules and can decide claim by claim whether to accept assignment or bill you the limiting charge. Going above that limit can expose the doctor to civil monetary penalties under Medicare's own manuals.

Nothing in Original Medicare caps how much of this adds up over a year. Wendell Potter, who writes the HEALTH CARE un-covered newsletter, pointed out in July 2026 that every other major kind of insurance in the country has an annual out-of-pocket cap. He also noted that 3.5 million traditional Medicare beneficiaries have no supplemental coverage at all. Outside the states that ban excess charges, any extra a doctor adds lands on them.

What strikes me is how quietly the rules can shift. Doctors can change their participation status only in November, and the change takes effect the next calendar year, so a doctor you saw last spring may be billing under different terms by January.

Below, you'll find what the extra really adds to a bill, which states block it, how Medigap plans handle it, and what to ask the front desk before your next appointment.

You did the careful thing. You asked the front desk whether the doctor takes Medicare, heard yes, and still opened a bill bigger than the share you had planned for. It's common to feel thrown by that. You are not alone, and you didn't miss anything obvious.

In a 2025 Reddit thread, a Medicare user who said Maryland has no law against excess charges asked whether "a random provider who accepts Medicare" could "just decide to tack on an extra 15%." Accepting assignment means agreeing to take Medicare's approved amount as payment in full. A doctor who skips it can add a limiting charge, sometimes called an excess charge, and you owe that extra plus your usual deductible and coinsurance.

Honestly, I wish more Medicare cost guides said this out loud. Most stop at coinsurance, as if that were the whole bill.

Doctors who leave Medicare entirely are rare. In November 2024, 12,244 non-pediatric physicians had opted out, or 1.2% of active physicians. So a surprise charge is more likely to come from a doctor who still bills Medicare and decides one claim at a time whether to take assignment.

Medicare patients have long been able to get appointments. An HHS brief found that in 2012, 8% of Medicare patients had skipped a doctor visit they thought they needed, compared with 11% of people with private insurance. Price is the blind spot.

Can a doctor who takes Medicare still charge you more than Medicare's approved amount?

Yes. A Medicare doctor who does not accept assignment can legally bill up to 15% above the Medicare-approved amount, and that extra sits on top of your 20% coinsurance.

Before your next appointment, you can ask the front desk three plain questions:

Do you accept Medicare assignment for all of my covered services?
If not, will you accept the Medicare-approved amount for this visit?
Will your office send the claim to Medicare, or will I need to file it myself?

Medicare.gov defines "accepting assignment" as taking the Medicare-approved amount as payment in full for a covered service. A doctor who accepts it agrees to charge you only the Medicare deductible and coinsurance. They send your claim to Medicare and can't charge you a fee for doing so. That is the arrangement most people picture when they hear a doctor takes Medicare.

The common assumption is that every doctor who takes Medicare has signed up for those terms. Only some have. Doctors choose one of three relationships with Medicare:

Participating. The doctor accepts assignment on every Medicare claim and can't bill you for anything above the approved amount.
Non-participating. The doctor still sees Medicare patients but decides claim by claim. When they skip assignment, they can charge more than the approved amount, up to a cap called the limiting charge.
Opted out. The doctor works outside Medicare through a private contract with you. Medicare pays nothing for that care, except in emergencies.

Most doctors sit in the first group. KFF reports that in 2022, 98% of physicians and practitioners billing Medicare were participating providers. That is reassuring. But the exceptions are easy to miss. Nothing in a waiting room tells you which group your doctor belongs to.

The claim-by-claim part is easy to overlook. A non-participating doctor can accept assignment for your checkup and decline it for a procedure next month. Some care works differently, though: non-participating providers still have to accept assignment for certain services, such as Medicare-covered ambulance rides, where you owe only your deductible and coinsurance. Combining 5 sources points to one plain rule: the word to listen for is assignment, not Medicare. I'd encourage you to ask about it at every new service, even with a doctor you've known for years.

The same question is worth asking of anyone who helps you with Medicare. In New Jersey, Understood Care accepts Original Medicare along with Medicare Advantage plans from UnitedHealthcare, Aetna and New Jersey Blue Cross Blue Shield. Our plan data shows about 79% of the state's Medicare Advantage members are with an insurer we accept, and we confirm coverage for each person before the first appointment. Help does not have to be down the street, either, and it can be worth reading why a Medicare advocate near you may not need to be local.

With a non-participating doctor, there is one more surprise. You may be asked to pay the full bill at the front desk, before Medicare has paid anything at all.

How much more do you actually pay when a doctor skips assignment?

The bill can top Medicare's full rate by 9.25%, not 15%, yet your own share still grows, because Medicare reimburses less and you pay the difference.

The 15% is real. It just sits on a smaller number than most people expect. ASHA's Medicare billing guidance explains that a non-participating provider's allowable fee is 95% of the Medicare fee schedule amount, a 5% reduction compared with participating providers. The limiting charge is 115% of that reduced fee. On a service Medicare values at $100, the most the patient can be charged is $109.25.

Put another way, a doctor who bills the full limiting charge ends up 9.25% ahead of a participating doctor, not 15%. That doctor also takes on a risk. On an unassigned claim, Medicare sends its payment to the patient instead of the office, and some patients never pass it along.

Here is how the same guidance works through a real 2022 rate for one audiology service:

Step in the bill	2022 amount	What it means for you
Medicare fee schedule rate	$89.98	What a participating provider is paid in full
Non-participating rate (95%)	$85.48	Medicare's reduced starting point
Limiting charge (115% of that)	$98.30	The most the office can bill you
Medicare reimburses you (80%)	$68.38	Sent to you, not to the provider
Left for you to pay	$29.92	Your share after Medicare's check arrives

Before you book, you can ask the office what the limiting charge comes to in dollars for your service, and how much Medicare will send back to you. One commenter in a 2025 Reddit thread said that money can come back "in bits," with a separate claim to file with your Medigap plan. You also pay the whole $98.30 up front and wait for Medicare's check, which can be hard on a fixed income.

Many consumer guides skip the 5% step and show the cap as a flat 15%. One 2024 explainer from an insurer that sells Medicare plans, for example, describes a $75 excess charge on a service Medicare pays $500 for. That shortcut can make the cap look larger than the billing rules allow, which matters when you sit down to check whether a bill went over the line.

If a bill like this lands on your kitchen table and the numbers don't match, Understood Care can help you check it. Our advocates are available in all 50 states, work with you virtually and are covered by Medicare. You can also compare Medicare patient advocate services for seniors before you decide who to call.

To me, the 15% is not the costliest risk anyway. In 2025, HealthExec reported, citing CMS, that nearly 50,000 physicians, about 5% of U.S. doctors, had withdrawn from Medicare participation, and that the AMA puts inflation-adjusted Medicare pay for physicians down 33% since 2000. If you see a psychiatrist, it can help to ask early whether the doctor still bills Medicare, since a 2013 KFF brief found psychiatrists made up the largest share, 42%, of doctors who had formally opted out.

What actually stands between you and a doctor's extra Medicare charge?

In short: What actually stands between you and a doctor's extra Medicare charge?: Even a physician leader can blur the rules on extra Medicare charges.

Even a physician leader can blur the rules on extra Medicare charges. We worked through one real bill and every protection people count on, and we found a gap in each.

In June 2025, the American Medical Association's House of Delegates debated whether to publish a guide to opting out of Medicare. Scott Ferguson, MD, a diagnostic radiologist on the AMA Board of Trustees, explained the option to Health Exec: "If you opt out, you can bill patients directly, and in some cases, receive up to 15% more."

Under Medicare's rules, that sentence actually describes two different groups of doctors. The 15% limit applies to non-participating doctors, who stay in Medicare but can decline assignment. Doctors who opt out sign private contracts that let them "bill any amount they determine is appropriate," according to KFF, the health policy research group, and Medicare pays nothing for their care except in emergencies. Even the size of the group gets confused. Citing CMS, the same article put opted-out physicians at "nearly 50,000." KFF counted 12,244 non-pediatric physicians, or 1.2%, as of November 2024.

	Participating	Non-participating	Opted out
What you can be billed	Only the deductible and coinsurance	Up to the limiting charge, "in many cases" 15% above the approved amount, possibly in full at the visit	Any amount set in a private contract
Who files the claim	The doctor, at no charge to you	The doctor should. If not, you can file it yourself	Neither you nor the doctor can bill Medicare
What Medicare pays	Its share, paid to the doctor	On unassigned claims, 80% of a rate cut by 5%, sent to you	Nothing, except in emergencies

Even inside the capped group, the 15% headline misleads. ASHA, the professional association for audiologists and speech-language pathologists, walked its members through a real 2022 audiology code, CPT 92626. Medicare's full rate was $89.98. A non-participating provider's rate drops 5%, to $85.48, and the limiting charge is 115% of that, or $98.30. Medicare reimbursed $68.38, which is 80% of the reduced rate. The patient was left with $29.92.

Limiting charge billed by a non-participating provider $98.30

Medicare's full fee schedule rate $89.98

Medicare reimburses the patient $68.38

Patient's share at the limiting charge $29.92

One real code, one bill. ASHA's example for CPT 92626 at 2022 national non-facility rates.

The bill rose only $8.32 above Medicare's full rate. Medicare's payment, however, shrank with the 5% cut, so the patient absorbed that cut plus the whole markup.

Two more details shape what happens at the front desk. On an unassigned claim, ASHA tells providers to collect the full limiting charge from the patient, and "Medicare will send reimbursement directly to the patient for the 80%." Non-participating doctors also decide "on a claim-by-claim basis," per KFF, so an office that took assignment at your last visit may not take it at your next one. Such doctors are a small group: in 2022, 98% of physicians billing Medicare were participating providers.

Every safeguard has a limit too. Eight states ban excess charges, but Humana's consumer guide notes that the ban covers care inside your home state, and outside it "you can still be charged." According to a help article from Via Benefits, a retiree insurance exchange, Minnesota bars the charges for its own residents but allows them for visitors to facilities such as the Mayo Clinic. Connecticut's ban protects only people in the Qualified Medicare Beneficiary (QMB) program. New York caps the charge at 5%, but certain office and home visits fall back to the federal 15%.

Medigap has limits as well. Only Plans F and G pay excess charges, and Plan F is closed to anyone who became eligible for Medicare on or after Jan. 1, 2020. The high-deductible versions pay excess charges only after the deductible is met, which Medicare.gov says can reach $2,950 in 2026. Excess charges also don't count toward the $283 Part B deductible.

Lined up, the findings show the 15% figure misleading in both directions. The doctor's bill rises less than 15% above Medicare's full rate, while your share absorbs both the markup and Medicare's 5% cut. The doctors with no ceiling at all are the opted-out group, which the 15% rule never covered. And every protection depends on a condition: where you get care, which plan letter you bought and when, and whether you have met a deductible. The only check with no condition attached is a question at the front desk about this service, at this visit.

Five checks the evidence points to

Ask which of the three statuses the doctor holds. If you're handed a private contract, Medicare will pay nothing for that care. Medicare.gov suggests talking with your State Health Insurance Assistance Program before you sign.
Ask about assignment again for each new service or visit, because a non-participating doctor decides claim by claim.
If a non-participating office wants full payment at the visit, check the total against the limiting charge, at most 109.25% of Medicare's full rate, and ask who files the claim. If the office won't, you can.
Before you travel to another state for care, ask about assignment there. Your home state's ban may not follow you across the state line.
On a high-deductible Plan G, expect to pay excess charges yourself until you meet the plan's deductible.

How we checked this

We used Medicare.gov pages, a CMS fact sheet, a KFF analysis, a billing guide from a professional association, consumer guides from an insurer and a retiree insurance exchange, and a trade news article. None of these figures are ours. ASHA's example covers one audiology code at 2022 national rates. Actual rates vary by locality and year. The state law details come from consumer guides, not from the statutes themselves. Humana sells Medigap and Medicare Advantage plans. Understood Care offers patient advocacy covered by Medicare, so we have a stake in readers looking for billing help. Health Exec attributes its opt-out count to CMS, and we could not reconcile that figure with KFF's. Still unknown: how often non-participating doctors actually bill the full limiting charge. None of our sources measured it.

Health Exec, article on physicians opting out of Medicare, July 2025.
KFF, analysis of physicians who have opted out of Medicare, January 2025.
Medicare.gov, page on whether your provider accepts Medicare as full payment, accessed 2026.
American Speech-Language-Hearing Association, guide to calculating Medicare fee schedule rates, 2022 example.
Humana, consumer guide to Part B excess charges, updated February 2026.
Via Benefits, help article on assignment and the Part B excess charge, January 2026.
Medicare.gov, Medigap plan benefits comparison, retrieved October 13, 2026.
Centers for Medicare & Medicaid Services, 2026 Medicare Parts A and B premiums and deductibles.

How can you avoid Part B excess charges or get them covered?

Before the visit, confirm the doctor accepts assignment for that service, learn whether your state bans excess charges, and check whether your Medigap plan pays them.

Ask about assignment for this service, not just in general. You can look up providers on Medicare.gov or call 1-800-MEDICARE (800-633-4227). Then ask the office directly, because a non-participating doctor decides one claim at a time.
Know your state's rule. Connecticut, Massachusetts, Minnesota, New York, Ohio, Pennsylvania, Rhode Island and Vermont restrict Part B excess charges. That protection covers care you get inside your home state, not a visit to a specialist across the border.
Check your Medigap letter. Plans F and G pay Part B excess charges. Plan N does not.

Medicare.gov puts the first step plainly: "Most doctors, providers, and suppliers accept assignment, but always check to make sure that yours do." If I could pick only one habit for you, it would be that one. It costs a phone call. It can spare you the limiting charge entirely.

Medigap plan	Pays Part B excess charges?	Worth knowing
Plan F	Yes	Open only to people eligible for Medicare before Jan. 1, 2020
Plan G	Yes	Same as Plan F except it leaves the Part B deductible to you
Plan N	No	Lower premium, with doctor and emergency room copays
Plan D	No	An older plan that few insurers carried in 2019

Excess charges also sit outside your deductible. They don't count toward the 2026 Part B deductible of $283, so paying one does not move you any closer to the point where Medicare starts sharing the cost.

How often does this happen? On The Everything Medicare Podcast in 2019, the host, a Medicare plan specialist, said doctors' excess charges typically are not billed and that they had never seen one charged in the areas where they worked. They also said such charges are illegal in some states but not impossible.

An insurance agent who sells supplement plans gave a sharper illustration on a 2024 podcast: a $10,000 procedure billed at $11,000 left a Plan N holder paying $1,000. Rare is not the same as small. A single procedure can also bring separate bills from separate providers, each with its own assignment status, and our walk-through of the three bills behind one cataract surgery shows how that looks on paper.

In Vermont, one of the ban states, Understood Care accepts Original Medicare along with Medicare Advantage plans from UnitedHealthcare and Humana, and an advocate can check a provider's status with you before you book. Call 646-904-4027 to talk with an advocate.

Traditional Medicare has no yearly limit on what you pay, so each excess charge simply adds to your total. A Senate bill reported in July 2026 would set a $5,000 annual cap starting January 1, 2028, and Medigap payments would count toward that total.

Who can check a doctor's bill with you before you pay it?

An advocate can. Your Part B premium is already $202.90 a month in 2026, so a surprise excess charge on top of it deserves a second look before you pay.

The premium figure comes from the Centers for Medicare & Medicaid Services. Doctors feel squeezed too. KFF reported that a 2.93% drop in average Medicare physician payments took effect on January 1, 2025, with no increase from Congress. A physician leader warned that same year that when pay falls below the cost of care, doctors have to do something. Sometimes that something lands on your bill.

Finding a doctor has rarely been the hard part. Federal survey data showed 90.7% of office-based physicians accepted new Medicare patients in 2012, close to the 87.9% seen in 2005. Knowing what that doctor may charge is harder.

Understood Care advocates can compare your bill with Medicare's approved amount and raise questions with the office for you. We confirm your coverage before your first session.

Call 646-904-4027 to talk with an advocate.

Why will a doctor's assignment choice keep shaping your Medicare bills?

In short: Why will a doctor's assignment choice keep shaping your Medicare bills?: Medicare's price protects you only when your doctor agrees to it.

Medicare's price protects you only when your doctor agrees to it. Until that changes, a doctor who skips assignment can still add up to 15%, visit after visit, with no yearly stop.

Christian Pean, a physician who writes about Medicare enrollment, laid out the split in 2026. Doctors who sign Medicare's participation agreement cannot charge you above the fee schedule rate, while non-participating doctors receive slightly lower payments and can balance-bill limited amounts. The choice is made on paperwork you never see.

Pay pressure is not easing. Congress passed four temporary one-year bumps to doctor pay after 2021, then none for 2025. A proposed yearly cap on Original Medicare cost-sharing would not start for years, and one health policy writer gave it little chance of passing in the current Congress.

My honest read: a cap that may never pass is a poor reason to skip coverage that handles excess charges today. A lower premium can look like savings right up until the first bill arrives.

Something else is missing. None of the sources behind this guide count how often limiting charges show up on real bills, and I'd want that count before calling these charges rare or routine.

Before your next appointment, ask the billing office one plain question: will I owe anything beyond my deductible and coinsurance for this visit? Ask again next time, since the answer can change from one claim to the next.

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Frequently Asked Questions

What else do people ask about Medicare limiting charges?

Most questions come down to three things: who can charge the extra, how much, and what you can do when a bill already includes it.

Can a participating doctor ever bill more than the Medicare-approved amount?

No. A participating doctor has agreed to accept assignment on every Medicare claim, taking the approved amount as payment in full. Healthgrades, in a 2025 Medicare explainer, says participating physicians cannot bill any amount above the Medicare-approved amount. You still owe your normal deductible and coinsurance.

Can a doctor who takes Medicare turn down new Medicare patients?

Yes. Participating doctors are not required to accept every Medicare patient, and each one decides how many people with Medicare to take on. So a doctor can take Medicare and still have no room for you. I'd ask two things on the same call: does the doctor accept assignment, and are they seeing new Medicare patients?

What's the difference between a non-participating doctor and one who opted out?

A non-participating doctor still bills Medicare and decides case by case whether to accept assignment, so one visit may carry an extra charge and the next may not. An opt-out doctor becomes a private contractor, sends no claims to Medicare and bills you directly. Opt-out has no case-by-case choice. Every visit works the same way.

Why would a doctor stop accepting assignment?

Pay is the main pressure the sources describe. Medicare's approved amount can be lower than what private insurance pays, and Medicare payments are not automatically indexed to keep pace with inflation in what it costs to run a practice. Skipping assignment lets a doctor collect a little more on some claims. The difference lands with you.

Does a Medicare patient advocate accept Medicare?

Understood Care's advocacy is available in all 50 states, delivered virtually and covered by Medicare. We support people with Traditional Medicare and Humana Medicare Advantage, and we confirm your coverage before your first session. An advocate can go through a bill that carries an excess charge and help you sort out what you actually owe. 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.

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How 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: October 14, 2026. 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: How a Doctor Can Legally Bill You 15% Over the Medicare Rate, reviewed by the Understood Care Editorial Team.