AAD
Author: Willhemenia Loremipsum Special session: Lorem ipsum dolor sit amet Category: Lorem ipsum View all results

Please login or create an account. If you do not have access to this content, you will be shown a 30 second preview and licensing options.

  • Presentation

Mohs Surgery Documentation, Coding, and Medicare Billing Rules

Description

The transcript explains key Mohs surgery documentation, coding, and Medicare billing rules. It emphasizes that Mohs must be performed by the same physician acting as both surgeon and pathologist; if excision or slide interpretation is delegated, it is no longer considered Mohs for Medicare purposes. The speaker highlights important reference materials such as CMS MLN Matters guidance, local coverage determinations, billing/coding articles, the NCCI Policy Manual, and the Mohs AUC app, noting that appropriate use criteria support Mohs but do not require it as the only treatment option. Documentation should clearly establish medical necessity, including tumor features such as poorly defined borders, deep invasion, recurrence, prior radiation, size, and tissue-sparing location. For each stage, records should describe invasion depth, pathology, and whether tumor remains; if clear, explicitly state “no tumor.” The talk also covers coding rules for tissue blocks, special stains, and immunohistochemistry, including that one stain unit applies per separate specimen, not per block if the tissue is from the same specimen. It explains multiple-stage billing, Medicare maximum unit edits, and how to appeal denials when additional stages are medically necessary. Other billing issues addressed include same-day biopsy or frozen section with Mohs, use of modifier 59, documentation for permanent sections, separate lesions, E&M services, flap repairs, and reconstruction coding. The speaker warns against poor electronic record templates that fail to describe a flap adequately and stresses documenting why a flap was needed, its design, and size. Finally, the transcript notes that certain debridement associated with delayed repair is not separately billable, and that a revised Medicare ABN form should be signed before noncovered or potentially noncovered services are provided.

View more

Conclusions

  • Mohs surgery must be documented and billed only when the same physician performs both the excision and the pathology interpretation, because otherwise the service is not considered true Mohs and may be viewed as fraudulent billing.
  • Accurate medical-necessity documentation is essential, with records showing why Mohs was chosen, what tumor features justified it, and how each stage and specimen was evaluated.
  • Medicare coverage for Mohs is governed by LCDs, MLN guidance, NCCI rules, and MUE limits, so payment depends as much on compliance with payer documentation rules as on clinical performance.
  • The number of tissue blocks, not the number of tissue pieces or slides, drives add-on billing, and tissue beyond five blocks per stage supports reporting 17315.
  • Appropriate use criteria support Mohs as an option but do not make it the only correct treatment, so clinicians must document why Mohs was selected over other reasonable therapies.
  • Subsequent Mohs stages can be documented more briefly if unchanged, but the first stage must include histology details such as depth of invasion, pattern, morphology, and perineural invasion or scarring.
  • If a stage count exceeds Medicare MUE limits, the excess unit may be denied and must be appealed rather than resubmitted unchanged.
  • Separate specimens are separately coded, but multiple blocks from one specimen still count as one specimen for immunohistochemistry billing.
  • When Mohs continues on a second day, billing restarts with the first-stage code and no modifier is needed because Mohs has a zero-day global period.
  • Same-day evaluation and management services may be billable with modifier 57 when they determine the need for Mohs, but same-day Mohs plus simple repair is not billed with the repair logic described for major surgery.
  • Flaps and other repairs require explicit operative descriptions, because generic EHR language is often insufficient to prove that a true flap or specific reconstruction was performed.
  • Debridement performed as part of delayed Mohs repair is generally bundled and not separately payable, so it should not be billed as an independent service.
  • For services that Medicare never covers or may not cover, an updated ABN should be obtained in advance to document patient awareness and protect against nonpayment disputes.
  • CMS Med Learn Matters SE 1318, Guidance to Reduce Mohs Surgery Reimbursement Issues, October 2020
  • NCCI Policy Manual 2025, Chapter 10, page X-18
  • NCCI Policy Manual, Ch III, H.2; 12,3
  • CPT® 2026 Definition: Specimen
  • Local Coverage Determination for Mohs Micrographic Surgery: L35702 (Noridian); L34961 (Novitas)
  • Mohs Surgery Documentation: LCD (Noridian JE, L34961)
  • Billing and Coding Articles (Noridian A56514, Novitas A53883)