Excess charges happen when a doctor bills you more than Medicare allows, and you pay the difference

An excess charge is the gap between what a doctor charges and what Medicare says that service is worth. If Medicare allows $100 for a procedure and the doctor charges $150, the excess charge is $50. Whether you pay it depends on whether the doctor has agreed to accept Medicare's payment as full payment — a status called being Medicare-participating.

Participating doctors write off the excess. Non-participating doctors can bill you for it, up to a legal limit of 15 percent above what Medicare allows. That 15 percent cap is the only protection you have; the doctor cannot charge more than that without breaking federal law.

The risk is real but manageable. Most doctors in most places are participating, but some specialties and some regions have higher rates of non-participating providers. Knowing the difference before you schedule matters, because you cannot always predict the bill afterward.

Key Takeaways

  • Participating doctors accept Medicare's allowed amount as payment in full and cannot bill you for the difference.
  • Non-participating doctors can charge up to 15 percent above Medicare's allowed amount, and you are responsible for that overage.
  • You can check whether a specific doctor participates in Medicare before you schedule an appointment using the Medicare Physician Comparison tool or by calling the office directly.
  • Emergency care and out-of-network situations carry higher excess charge risk, so ask about billing status before elective procedures when possible.
  • If a doctor bills you illegally for excess charges, you can report them to Medicare and request a refund.

How the 15 percent limit works in practice

Medicare sets an allowed amount for each service based on a fee schedule. For example, Medicare might allow $80 for an office visit. A participating doctor receives $80 (after your copay or coinsurance) and stops there. A non-participating doctor can charge you up to $92 — that is $80 plus 15 percent of $80.

The 15 percent rule applies to the allowed amount, not to what the doctor actually charges. If a non-participating doctor charges $200 for that same visit, Medicare still only allows $80, and the doctor can only bill you for $92 of it. The remaining $108 is written off as a contractual adjustment.

This limit exists because Congress wanted to prevent unlimited balance billing. Before the cap was set, some non-participating doctors charged whatever they wanted and sent patients the bill. The 15 percent rule was meant to keep that from happening, though it still means you can owe money that a participating doctor would not charge.

Which doctors are participating and how to find out

Most primary care doctors, cardiologists, and orthopedists in urban and suburban areas participate in Medicare. Psychiatrists, pain management specialists, and some surgical subspecialties have higher rates of non-participation. Rural areas often have fewer participating doctors straightforward because there are fewer doctors overall.

You can search the Medicare Physician Comparison tool at Medicare.gov. Enter the doctor's name and location, and the tool will tell you whether they are participating, non-participating, or opted out of Medicare entirely. The tool is not always current — it updates monthly — so if you get an unclear result, call the doctor's office directly and ask: "Does this doctor accept Medicare assignment?" Assignment means they accept the allowed amount as full payment.

When you call, ask specifically about the services you need. A doctor might participate for some services and not others, though this is uncommon. Write down the answer and the date you called; if you later receive a bill that contradicts what you were told, you have documentation.

Situations where excess charges are most likely

Emergency and urgent care carry the highest risk. If you go to an emergency room or urgent care clinic, you may not know whether the doctor is participating until after you are treated and the bill arrives. Emergency doctors are often employed by staffing companies rather than the hospital, and those companies sometimes do not participate in Medicare.

Specialist referrals also create risk, especially if you are referred out of your insurance network. Your primary care doctor might participate, but the cardiologist or surgeon they refer you to might not. Ask your primary care doctor whether the specialist participates before you go, or call the specialist's office yourself.

Surgical procedures and imaging studies done at non-hospital facilities — imaging centers, surgery centers, labs — sometimes involve non-participating providers. The facility itself might be in-network, but the radiologist reading your scan or the anesthesiologist in the operating room might not be. This is called a "surprise bill" situation, and it is one of the most common sources of excess charges.

What to do before a scheduled procedure

For any elective procedure — surgery, imaging, a specialist visit — call ahead and ask three things: (1) Is the primary provider participating in Medicare? (2) Are all the doctors who might be involved (anesthesiologist, radiologist, pathologist) participating? (3) What is the total expected cost, and what will Medicare cover?

Write down the names of everyone who answers, the date, and what they told you. If you later receive a bill for excess charges from someone you were told was participating, you have a record to dispute it with.

For imaging and surgery, ask whether the facility can may provide that all providers involved are participating. Many facilities now offer this may provide because surprise bills have become a political issue. If they cannot may provide it, ask them to put in writing which providers are non-participating so you know what to expect.

If you receive a bill for excess charges

First, check whether the doctor actually is non-participating. Search the Medicare Physician Comparison tool again or call Medicare directly at 1-800-MEDICARE. If the tool says the doctor is participating, the bill is wrong, and you should not pay it.

If the doctor is non-participating, check the math. Take the Medicare allowed amount (it should be on the Explanation of Benefits you receive from Medicare), multiply by 1.15, and see whether the bill exceeds that. If it does, the doctor has overcharged you and is breaking federal law.

Report the overcharge to Medicare by calling 1-800-MEDICARE or filing a complaint online at Medicare.gov. Include the doctor's name, the date of service, the amount charged, and the Medicare allowed amount. Medicare will investigate and can require the doctor to refund you. You can also refuse to pay the excess and let the doctor pursue collection, though that will affect your credit unless you resolve it.

Strategies to reduce your excess charge risk

Choose a primary care doctor who participates in Medicare and stay with them. They know your history, can coordinate your care, and can refer you to participating specialists. This single step eliminates most excess charge risk for routine care.

When you need a specialist, ask your primary care doctor for a referral to someone they know participates. They often have relationships with participating specialists and can steer you toward them. If you choose your own specialist, verify participation before you schedule.

For imaging and lab work, ask whether your doctor's office can order it from a participating facility. Many areas have multiple imaging centers and labs, and your doctor can usually choose one that participates in Medicare. This takes one phone call and can save you hundreds of dollars.

If you are considering a procedure at a surgery center or imaging center, ask the facility directly whether they can may provide all providers are participating. If they cannot, ask for a list of non-participating providers and call those providers to ask what they charge above the Medicare allowed amount. This gives you a real estimate of what you might owe.

Frequently Asked Questions

Does my Medigap or Medicare Advantage plan cover excess charges?

Medigap plans vary. Some cover excess charges up to the 15 percent limit; others do not. Check your plan documents or call your insurer to ask specifically whether they cover "excess charges" or "balance billing." Medicare Advantage plans are required to limit your out-of-pocket costs, but they do this by restricting which doctors you can see, not by covering excess charges from out-of-network doctors.

What if the doctor says they are participating but bills me for excess charges anyway?

This is fraud. Report it to Medicare at 1-800-MEDICARE and to your state's medical board. Do not pay the bill. Medicare will investigate, and if the doctor is found to have overcharged, they can lose their participating status and face penalties.

Can I negotiate the excess charge down if I call the doctor's office?

Sometimes. If you call before treatment and explain that you are on Medicare, some non-participating doctors will agree to accept the Medicare allowed amount or a smaller overage. This is not may provide, but it costs nothing to ask. Get any agreement in writing before the procedure.

Does the 15 percent limit explore to emergency room visits?

Yes, the 15 percent cap applies to all non-participating doctors, including emergency room physicians. However, emergency situations make it harder to verify participation beforehand. After an emergency visit, always check your bills carefully and report any overcharges to Medicare.

What if I see a non-participating doctor and cannot afford the excess charge?

Call the doctor's billing office and explain your situation. Many offices will negotiate or set up a payment plan. You can also ask whether the doctor will accept the Medicare allowed amount as full payment as a courtesy, especially if you are a regular patient. Some will, some will not, but asking is free.