Mohs in 2026: the single number that decides whether your claim survives audit
It is not the diagnosis. It is not the payer. It is your stage count, and whether one surgeon read the slides. Get those two right and the rest is arithmetic.
Mohs reimbursement is built one stage at a time. You bill the first stage once (17311 or 17313), then every additional stage as an add-on (17312 or 17314), then extra tissue blocks beyond five per stage (17315). The number of stages your documentation supports is the number that gets paid, and it is the first number an auditor recounts against your maps and slides.
The second trip-wire is the same-surgeon pathology rule. The Mohs codes only exist because one physician acts as both the surgeon and the pathologist on the same day. Send the tissue to a separate pathologist and you have not done Mohs, you have done an excision plus a path read, and the codes change completely. Bill a separate pathology or frozen-section code on that same specimen and NCCI bundles it right back out.
Everything below is how those two numbers behave under the CMS CY2026 Physician Fee Schedule and current NCCI edits.
The stage ladder is the reimbursement engine
Payment climbs with each documented stage and each extra block, not with the size of the lesion or the payer on the card. Read the ladder the way an auditor reads your operative note: one countable step at a time.
Head, neck, hands, feet, genitalia. First stage, up to 5 tissue blocks. Billed once per site, per session.
Add-on to 17311. Each additional stage, up to 5 blocks. Report per stage actually taken and mapped.
Trunk, arms, legs. First stage, up to 5 tissue blocks. The anatomic twin of 17311, different site family, never both on the same lesion.
Add-on to 17313. Each additional trunk/extremity stage, up to 5 blocks.
Add-on, any stage. Each additional tissue block beyond the first five in any single stage. This is where high-block cases quietly earn or quietly leak.
One physician, both roles, or it is not Mohs
The Mohs family assumes the operating physician personally acts as pathologist and reads the frozen sections during the same session. That single fact decides which codes you are even allowed to open.
Surgeon reads the slides
Same physician excises, maps, and personally interprets the frozen sections in one session. This is the entire premise of 17311 to 17315.
Tissue goes to a separate pathologist
A different provider reads the specimen. The Mohs premise is broken. Report the excision and the separate pathology under their own codes, never the Mohs set.
What NCCI bundles into the Mohs stage, and what it does not
The Mohs codes already pay for the surgeon acting as pathologist and for simple wound handling. NCCI Procedure-to-Procedure edits enforce it. Know which lines are baked in and which survive with documentation and the right modifier.
| Same-day service on the Mohs specimen | Status | Why |
|---|---|---|
| Surgical pathology on the Mohs tissue (88302 to 88309) | Bundled | The path read is the reason Mohs codes pay more. Reporting it separately double-counts the same work. |
| Frozen section pathology (88331/88332) on the same specimen | Bundled | Intraoperative slide reading is intrinsic to each Mohs stage. Not separately payable by the same surgeon. |
| Simple repair of the Mohs defect | Bundled | Basic wound closure is included in the stage value. |
| Intermediate / complex repair (12031 to 13160) | Separable | Distinct, documented layered or complex closure may be reported, with the payer-appropriate modifier and its own note. |
| Adjacent tissue transfer, flap or graft reconstruction | Separable | A separately identifiable reconstruction is its own procedure when the operative detail supports it. |
| Diagnostic biopsy of a different lesion, same day | Separable | A distinct lesion, distinct site, supported by a modifier that documents the separate service, not a default 59. |
An edit existing does not prove both services are billable. A bypass modifier is a documentation claim, not a shortcut, and it has to be true on the complete claim.
Three counts an auditor recounts first
Clean stage counts feed clean quality reporting
Under the CY2026 Quality Payment Program, dermatology practices reporting through MIPS and the dermatology-relevant MVP carry measures that lean on the same documentation discipline your Mohs claims already need.
- CMS CY2026 Medicare Physician Fee Schedule Final Rule. Sets the conversion factor and relative value inputs that price each Mohs stage and add-on.
- CPT codes 17311, 17312, 17313, 17314, 17315 (AMA CPT 2026). The Mohs micrographic surgery family, first-stage, additional-stage, and additional-block structure.
- National Correct Coding Initiative (NCCI) Procedure-to-Procedure edits and Policy Manual, 2026. Bundling of same-day surgical and frozen-section pathology and simple repair into the Mohs stage.
- CMS Quality Payment Program, MIPS and the dermatology MVP for the 2026 performance year. Quality measures for melanoma continuity of care and biopsy reporting.
Recount your Mohs claims before an auditor does
ASP-RCM builds dermatology billing around the two numbers that decide the claim: the stage count and the same-surgeon pathology check. We reconcile every 17312 and 17314 to a documented stage, catch 17315 blocks that quietly leak, and hold NCCI bundling and modifiers to what the note actually supports, so your claims survive the recount.
Talk to our dermatology billing team →This brief is coding guidance, not legal or payer-specific advice. Verify against your current CMS CY2026 PFS, NCCI edition, and payer policy.
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