Does insurance cover Mohs surgery? How the cost actually works
This is one of the most searched questions about skin cancer treatment and one of the worst answered, because the honest answer is “it depends,” and most pages stop there. It does depend, but the things it depends on are knowable, and once you understand how the pricing is built you can ask much better questions.
Two honest limits before we start. I cannot tell you your price, because it is set by your specific insurance plan and where you are in your plan year, not by me. And nothing here is a promise about your coverage. What this article can do is explain the machinery, so the bill and the phone call to your insurer both make more sense.
The short version
Mohs surgery treats cancer. It is medical care, not cosmetic care, and medically necessary skin cancer treatment is generally handled by insurance the way other medical care is: subject to your deductible, your coinsurance, and your network, but covered in the ordinary sense rather than excluded.
That single distinction, medical versus cosmetic, is the one that matters most, and we will come back to it. Almost everything else is arithmetic once you know the terms.
“Covered” does not mean paid for
This is the misunderstanding that causes the most unpleasant surprises, so it is worth spelling out completely before anything else.
People throw the phrase around loosely. It’s covered by insurance. It sounds like a conclusion, and it feels reassuring, but it does not mean your insurance is going to pay for it. All “covered” actually means is that the service is a benefit your plan participates in, so the cost runs through the shared-payment rules rather than falling entirely on you.
Which means the useful question is never is it covered. The useful question is how much of it is covered. Coverage comes out as a percentage.
Say a procedure is covered at eighty percent. That sounds generous, and it means the plan pays eighty percent and you still owe the remaining twenty percent. At which point the next question becomes the one that actually determines what you pay:
Twenty percent of what number?
Not the sticker price. Your share is a percentage of the allowed amount, the rate your plan and your physician have already agreed on, which is usually well below the sticker charge. And that eighty-twenty split only starts once your deductible is satisfied. Before that point, a fully covered procedure can still be almost entirely your responsibility.
So “it’s covered” is the beginning of the conversation, not the end of it. The rest of this article is about getting to the actual number.
Where prices come from: the Medicare RVU system
Almost nobody realizes that most medical prices in the United States trace back to a single public formula, and that you can look it up.
Every medical procedure has a billing code, and Medicare assigns each code a number of relative value units, or RVUs. RVUs are a measure of how much work, expense, and risk a procedure involves relative to every other procedure. A quick office visit has few RVUs. A multi-stage cancer surgery with a complex reconstruction has many. The point of the system is to rank everything on one scale.
To turn RVUs into dollars, Medicare multiplies them by a conversion factor, a single dollar amount updated each year, with an adjustment for local cost of living. The exact numbers change annually and are published by the Centers for Medicare and Medicaid Services in a public fee schedule lookup tool. [1] The mechanism, though, does not change: procedure code, times its RVUs, times the conversion factor, equals the Medicare price.
Here is why this matters to you even if you are not on Medicare. Private insurers generally build their own payment rates as a multiple of the Medicare rate, and medical practices generally set their charges with the same schedule in view. So that public formula quietly anchors what nearly everyone pays and charges. It is not a secret and it is not arbitrary. If you want to see the relative cost of two procedures before anyone quotes you anything, the RVUs are published.
The insurance words that actually determine your bill
Whether a procedure is “covered” is only the first of several questions. These are the terms that decide the rest.
| Term | What it actually means |
|---|---|
| Covered | Your plan participates in paying for the service. It does not mean free, and it does not mean the plan pays all of it. Coverage is a percentage, and the rest is yours. |
| Deductible | The amount you pay yourself each year before the plan starts paying its share. If your deductible is not yet met, a covered procedure can still be mostly your responsibility. |
| Copay | A fixed dollar amount for a service, say for an office visit. Procedures like surgery more often use coinsurance instead. |
| Coinsurance | The percentage of the cost you pay after the deductible is met. Twenty percent coinsurance means the plan pays eighty percent and you pay twenty, up to the limit below. |
| Out-of-pocket maximum | The most you can pay in a plan year. Once you reach it, the plan pays the rest. This is the number that caps a bad year. |
| In-network / out-of-network | Whether your physician has a contract with your plan. In-network care is billed at agreed rates. Out-of-network care can cost dramatically more, and is the single most common source of a shocking bill. |
| Allowed amount | The rate your plan and physician have agreed on for a code. Your coinsurance is a percentage of this, not of the higher sticker charge. This is the “what number” in “twenty percent of what number.” |
| Prior authorization | Some plans require approval before certain procedures. For standard skin cancer surgery it is often not needed, but it is worth confirming, because a missing authorization can turn a covered service into a denied one. |
If you take one thing from this table: the two levers that move your out-of-pocket cost most are your deductible status and whether the physician is in network. Both are answerable with one phone call.
Why a Mohs bill has several line items
People are often surprised that one appointment produces a bill with multiple charges on it. That is not padding. It reflects how the procedure is actually structured.
Mohs is billed by stage. As I have described in the hour-by-hour walkthrough, the surgeon removes a layer, reads the entire margin, and removes more only where cancer remains, repeating until the margin is clear. Each of those passes is a stage, and the billing mirrors it: there is one code for the first stage and a separate add-on code for each additional stage. A tumor cleared in one pass bills for one stage; a stubborn one that takes three passes bills for three. This is also why the cost cannot be known in advance. It depends on what the microscope finds.
You may also see a charge for an extra block, which is worth explaining because the word means nothing outside a lab. The piece of skin that is removed has to fit on a standard microscope slide. If it is larger than one slide, it gets cut into pieces so that each piece fits, and each of those pieces is called a block. Almost every skin cancer fits on a single block. Some are large enough to need two or more slides to view one complete layer of tissue, and that is when the extra-block charge appears.
Then, separately, comes the repair. Closing the wound is its own procedure with its own code, and repairs are priced by how involved they are, from a straightforward stitched closure through layered closures, complex repairs, and flaps or grafts where tissue has to be moved to rebuild the area.
So a single Mohs visit can legitimately generate charges for the first stage, one or more additional stages, occasionally an extra block, and a repair. Multiple lines describe real, separate steps of one operation.
Mohs versus a standard excision, on cost
A fair question is why Mohs, which generates several charges, is ever chosen over a standard excision, which is billed more simply. On the day, Mohs usually does cost more.
But the comparison is not that clean, for a reason that only shows up later. A standard excision is a single removal whose margins are read by an outside lab days afterward. When those margins come back positive, meaning cancer was left behind, the answer is another procedure on another day, with its own facility time, its own pathology, and its own bill. Mohs reads the entire margin during the appointment, so that second round is built into the first. The procedure that looks cheaper up front can end up costing more if it has to be repeated, and it is repeated most often on exactly the tumors where Mohs would have been chosen anyway. Which tumors those are is the subject of a separate article.
The honest summary: Mohs is not the cheapest option for every tumor, and it is not meant to be. For the tumors it is appropriate for, comparing only the first bill is comparing the wrong thing.
The line that decides coverage: medical or cosmetic
This is the distinction that determines whether insurance is involved at all, and it is worth being precise about.
Treating a skin cancer is medical. Removing a diagnosed cancer, and reconstructing the wound that removal creates, is medically necessary care, and plans generally treat it as such. The reconstruction is part of the cancer treatment, not a cosmetic add-on, even though its purpose includes how the area looks and works afterward. A repair exists because a hole was made removing a cancer.
The word “cosmetic” in insurance has a narrower meaning than in everyday speech. It refers to procedures done purely to change appearance with no medical indication, and those are typically not covered. Cancer surgery and its repair are not that, and should not be described as that. If any part of a skin cancer procedure is ever characterized to you as cosmetic, that is worth a direct question, because it changes the coverage entirely.
How to call your insurance and get a real estimate
If you want an actual number before the procedure rather than “it depends,” you can get one. It takes a single phone call, and knowing how that call is going to go makes it far less frustrating.
1. Find the number
On the back of your insurance card there is a phone number, usually labeled Member Services or Customer Service. That is the one to call. The number on a bill or an explanation of benefits goes to a different department and is not the one you want for an estimate.
2. Ask for a cost estimate on a specific procedure
Tell them you have a procedure scheduled and you want to know your estimated out-of-pocket cost. That phrasing routes you to the benefits side of the house. To give you a real answer rather than a generic one, they will ask you for two kinds of code: the CPT codes for the procedure and the ICD-10 code for the diagnosis. Have them written down before you call, and the whole thing takes a few minutes instead of half an hour.
3. Understand the two codes, and where to get yours
Every procedure is described by two code systems, and they answer different questions:
- A CPT code says what was done, meaning the procedure. Each Mohs stage and each type of repair has its own CPT code.
- An ICD-10 code says why, meaning the diagnosis. Your skin cancer has a diagnosis code, and it is specific enough to encode the body site.
Your dermatology office can give you the official codes they intend to use, and those will always produce the most accurate estimate. Ask for them. But you do not have to wait on a callback to make progress: these codes are public and searchable online, and the examples below are close enough to get a useful estimate started if the office has not gotten back to you yet.
| Diagnosis (ICD-10) | Example code |
|---|---|
| Basal cell carcinoma of skin | C44.91 (unspecified site) |
| Squamous cell carcinoma of skin | C44.92 (unspecified site) |
| Melanoma of skin | C43.9 (invasive) or D03.9 (in situ) |
For the procedure codes, there is a strategy worth knowing. You will not know in advance how many stages the surgery will take or which repair you will need, because both are decided during the operation. So when you call, ask about the more expensive possibilities rather than the simplest ones. If you price a basic stitched closure and end up needing a flap, your estimate will be far too low and the real bill will feel like a betrayal. Asking about the complex repairs gives you a realistic ceiling, and being pleasantly surprised is a much better outcome than the reverse.
| Procedure (CPT) | Example code |
|---|---|
| Mohs, first stage, on the face, ears, scalp, neck, hands, feet, or genitalia | 17311 |
| Mohs, each additional stage, those same areas | 17312 |
| Mohs, first stage, on the trunk, arms, or legs | 17313 |
| Mohs, each additional stage, trunk, arms, or legs | 17314 |
| Each extra tissue block, if the sample needs more than one slide | 17315 |
| Complex repair | 13100 and up |
| Flap (nearby tissue moved to close the wound) | 14000 and up |
| Skin graft | 15000 series |
4. Understand the numbers you get back
This is where most people stop too early. They hear “you’re covered at eighty percent” and hang up, which is not enough information to know what to have in the bank. Work through this list instead, and write down each answer:
- What is my deductible, and how much of it have I already met this year? The gap between those two numbers is money you pay before the plan contributes anything.
- Will this procedure meet the rest of my deductible? Often it will, which matters, because everything else you need this year gets cheaper afterward.
- Is there a copay for this, and how much?
- What is my coinsurance percentage for this procedure? This is the share you owe after the deductible is satisfied.
- What is the allowed amount for each of these codes? This is the number your percentage applies to.
- Is any part of the charge not covered at all? Anything above the allowed amount, or any code the plan excludes, can land on you in full.
- What is my out-of-pocket maximum, and how much of it have I met? This is the ceiling on the whole year.
Now you can work out the part that actually matters, which is how much cash you need available. Add together:
- Whatever is left on your deductible, up to the allowed amount for the procedure.
- Any copay.
- Your coinsurance percentage of whatever is left of the allowed amount once the deductible is satisfied.
- Any portion of the charge the plan does not cover at all.
That total, capped by whatever remains on your out-of-pocket maximum, is roughly what you should be ready to pay.
And if you would rather not do that arithmetic on the phone, there is a shortcut. Ask them directly:
“What is the amount of cash I need to have available for this procedure?”
That question forces the representative to combine all of it into one figure, which is what you actually wanted to know. Make them say the number.
Two cautions. First, everything they quote is an estimate, not a guarantee. It is a quote of benefits, not an authorization, and the final bill governs. Second, the estimate assumes the exact codes you gave them, so if the surgery differs, an extra stage or a more involved repair, the real cost will differ too. Write down the reference number for the call; it is useful if a bill ever has to be disputed.
If you do not have insurance, or are thinking about paying cash
If you are uninsured, skip the insurance call entirely and ask the physician’s office directly for an out-of-pocket estimate. Practices deal with this regularly and can usually tell you what a self-pay procedure runs.
If you do have insurance, you may notice that the cash price looks lower than what you would owe after a deductible, and be tempted to pay out of pocket and skip the claim. That is sometimes a reasonable choice, but there are two consequences people rarely think about until later:
- It does not count toward your deductible. A procedure you pay for outside insurance does nothing to move you toward the point where your plan starts paying, and nothing toward your out-of-pocket maximum. If you need other care later in the same year, you will still be starting from where you were.
- You give up the discount your insurer negotiated. One of the things insurance quietly does is force the charge down to the allowed amount. Pay outside the plan and that repricing never happens, so you are negotiating on your own against the full charge.
Neither of those makes paying cash wrong. They just mean the comparison is not simply which number is smaller today.
How to avoid a surprise
Most billing shocks come from a small number of avoidable gaps. Before a scheduled procedure, these questions close nearly all of them.
- Is this physician in network for my specific plan? Not just “do they take my insurance,” but in network for your exact plan, since the same insurer runs many plans.
- Have I met my deductible this year? It changes what a covered procedure costs you today.
- Does my plan require prior authorization for this? Ask both the office and the insurer.
- Can the office give me a cost estimate? Because the number of Mohs stages is unknown in advance, an estimate is a range rather than a figure, but a range is far better than nothing.
- If a repair needs a different specialist, are they in network too? Occasionally a reconstruction involves another surgeon, and their network status is separate.
None of this needs to happen in a panic. A skin cancer that warrants Mohs is worth treating properly, and cost questions are a reason to make a phone call, not a reason to delay care.
The bottom line
Mohs surgery is cancer treatment, which means it is medical care and is generally covered like other medical care. But “covered” is a percentage, not a promise, and the number that percentage applies to is the allowed amount rather than the sticker price. The prices underneath all of it trace to a public Medicare formula you can look up.
What determines your share is mostly two things you can check in advance: whether you have met your deductible, and whether your physician is in your plan’s network. Call the number on your card, bring the codes, ask for the more expensive scenario rather than the cheapest, and finish by asking what cash you need available.
Do that and most of the uncertainty in “it depends” resolves into a number you can plan around.
References
- Centers for Medicare & Medicaid Services. Physician Fee Schedule Look-Up Tool. cms.gov. The public source for procedure codes, their relative value units, and the annual conversion factor.
Magnolia Forge Dermatology is coming to Raleigh, North Carolina. We are not yet scheduling appointments.
Medical content: William S. Farmer, MD · Last reviewed: July 2026
