If you have Original Medicare and you have ever looked at a medical bill and thought, “Wait, why is this higher than I expected?”, Part B excess charges are one of the sneakier reasons that can happen. The good news is some states flat-out ban them. The tricky part is that most states still allow them, so your cost comes down to which kind of provider you see and whether they accept Medicare assignment.
What is a Medicare Part B excess charge?
A Part B excess charge is an extra amount you can be billed when a provider (such as a physician or practitioner):
- Is allowed to treat Medicare patients, but
- Does not accept Medicare assignment for your visit, and
- Charges more than Medicare’s allowed amount for that Medicare-covered service
In plain language: Medicare has a set allowed amount for a service. If your provider is permitted to bill Medicare and they do not accept assignment for your claim, they may be allowed to bill somewhat above that amount. That extra amount is the excess charge.
Scope note: Excess charges mainly come up with non-participating physicians and certain other Part B clinicians and suppliers. Participating providers must accept assignment for all Medicare patients, so excess charges do not apply to them. Many other outpatient bills (especially facility charges) do not work the same way.
Assignment, in plain terms
Accepting assignment means the provider agrees to Medicare’s allowed amount as payment in full for the Medicare-covered service and bills Medicare directly. When a provider accepts assignment, excess charges do not apply.
The limiting charge, explained simply
The limiting charge is Medicare’s cap on how high that “extra amount” can go for Medicare-covered services when you see a non-participating provider who does not accept assignment. It is commonly described as a provider being allowed to charge up to 15% above the Medicare-approved amount for that service. Technically, the limit is based on Medicare’s non-participating fee schedule calculation.
That does not mean every provider will charge it. It means they may be allowed to, unless your state has rules that prohibit or effectively prevent it.
Quick mental picture: Medicare’s allowed amount is the base price. An excess charge is a mark-up above that base price. The limiting charge is the maximum allowed mark-up.
States that ban or limit excess charges
These states are commonly cited as having rules that prohibit (or effectively prevent) Medicare Part B excess charges for Medicare-covered services:
- Connecticut
- Massachusetts
- Minnesota
- New York
- Ohio
- Pennsylvania
- Rhode Island
- Vermont
Because state rules can be nuanced and can change, treat this as a starting point. Before you make a plan decision, confirm your state’s current rule with a reliable source such as your State Health Insurance Assistance Program (SHIP) or your state department of insurance.
I live in Columbus, Ohio, so this one is personal: it is nice to know that, at least on the excess-charge front, Ohio residents have one less “gotcha” to worry about when comparing Medigap options.
Important caveat: Even in a state that bans excess charges, you can still see higher bills for non-covered services or for providers who opt out and use private contracts. Those situations are separate from the Part B excess-charge rules.
In other states, it depends on provider status
If your state is not on the list above, excess charges are generally allowed under Medicare rules. That does not mean you will definitely pay them. It means you need to pay attention to provider status and whether your provider takes assignment.
1) Participating providers: they accept assignment
A participating provider agrees to accept Medicare assignment for all Medicare patients. In everyday terms, they agree to take Medicare’s allowed amount as the price for covered services.
- You generally owe your normal share under Original Medicare (after any deductible and coinsurance rules).
- No excess charges because assignment is accepted.
Good news here: many clinicians are participating providers, which is one reason lots of people never run into excess charges at all.
2) Non-participating providers: assignment varies
A non-participating provider is still allowed to see Medicare patients, but they can decide visit by visit whether to accept assignment.
- If they do accept assignment for your visit, it works like a participating provider for that claim.
- If they do not accept assignment, they may be able to bill up to the limiting charge for Medicare-covered services.
3) Opt-out providers: Medicare generally will not pay
Some providers “opt out” of Medicare entirely and use private contracts. In those cases, Medicare typically does not pay for that care, and Medigap usually does not pay either because Medigap supplements Medicare-covered costs. Private contract rules can be specific, so it is worth confirming with the provider and your Medigap insurer if you are unsure.
If you are trying to avoid surprises, the practical move is to ask the office staff:
- “Do you accept Medicare assignment?”
- “Are you a participating provider?”
- “If not, will you accept assignment for my visit?”
You can also look up a clinician’s participation status on Medicare.gov Care Compare, then confirm with the office before your appointment because billing practices can vary by claim.
How assignment changes the bill
Let’s keep the math clean. Imagine Medicare’s allowed amount is $200 for a Part B service.
- If the provider accepts assignment, they bill Medicare at the allowed amount. Your costs follow the normal Part B rules (and any Medigap coverage you have).
- If the provider does not accept assignment, the service is Medicare-covered, and your state allows excess charges, they may bill up to about $230 (commonly described as $200 plus up to 15%). The extra $30 is the excess charge.
Whether that $30 is “no big deal” or “painful” depends on how often it happens and whether your Medigap plan covers it.
What this means for Plan G vs Plan N
This is where the excess-charge topic matters in a very practical way.
Plan G: protection from excess charges
In most states, Medigap Plan G covers Part B excess charges. So if you see a provider who does not accept assignment and bills up to the limiting charge, Plan G is designed to pick up that excess amount (as long as it is a Medicare-covered service and excess charges are permitted where you live).
Medigap standardization note: Medigap benefits are standardized differently in Massachusetts, Minnesota, and Wisconsin, so the way benefits are packaged and labeled can look different there even when consumer protections are similar.
Plan N: you may be exposed to excess charges
Plan N does not cover Part B excess charges. Plan N can be a great value for many people, but the tradeoff is that if you run into excess charges, you could pay them out of pocket.
Also, to keep it clear: neither Plan G nor Plan N covers the Medicare Part B deductible. The big Plan N differences are typically the lower premium, possible copays for certain office and emergency room visits, and no coverage for excess charges.
So what changes if your state bans excess charges?
If you live in a state that prohibits (or effectively prevents) excess charges, one of the classic reasons people lean toward Plan G gets smaller. You are not choosing Plan G just to avoid a 15% excess charge that generally cannot be billed in your state anyway.
That does not automatically make Plan N the winner. You still need to weigh premiums versus the other out-of-pocket tradeoffs.
Bottom line: In states that ban excess charges, the Plan G vs Plan N decision is less about “what if my doctor bills extra?” and more about premiums versus the other cost-sharing features.
Fast checklist before you pick a plan
- Confirm your state rule: CT, MA, MN, NY, OH, PA, RI, and VT are widely listed as prohibiting or limiting excess charges, but verify current rules with your SHIP or state department of insurance before you decide.
- Check assignment: Many people never pay excess charges because their doctors accept assignment.
- Verify status: Use Medicare.gov Care Compare to look up participation, then confirm with the office for your specific visit.
- Match the plan to your habits: If you travel a lot, see specialists frequently, or want fewer billing surprises, excess-charge coverage can feel more valuable.
- Do the premium math: A lower premium can be a win, but only if the tradeoffs fit your budget and comfort level.
Quick aside: Medicare Advantage plans handle provider billing differently than Original Medicare plus a Medigap plan. Excess charges are mainly an Original Medicare concept.
FAQ
Are excess charges the same thing as the Part B deductible?
No. The Part B deductible is a set amount you pay before Medicare starts paying its share for Part B services. Excess charges are an extra amount some non-participating providers can bill above Medicare’s allowed amount when they do not accept assignment.
Can a provider charge more than 15% above the Medicare-allowed amount?
For Medicare-covered services under the excess-charge rules, the limiting charge is commonly described as up to 15% above the Medicare-approved amount for that service, based on Medicare’s non-participating fee schedule calculation. If a provider has opted out of Medicare and uses a private contract, that is a different situation and can look very different.
How do I know if my doctor accepts Medicare assignment?
You can ask the office directly. You can also check participation on Medicare.gov Care Compare, then confirm with the office before an appointment because billing policies can be nuanced.
If my state bans excess charges, does that mean all my Part B costs disappear?
No. A ban just removes one specific type of extra billing. You can still have deductibles, coinsurance, and copays depending on your coverage and the services you use. You can also still see higher bills for non-covered services or private contracts, which are separate issues from excess charges.
Note on state rules
Medicare billing rules and state insurance laws can change, and details can depend on provider type and the specific claim. If you are making a high-stakes decision, confirm your state’s current rule with your state department of insurance or SHIP and talk with a licensed Medicare professional who can apply it to your situation.