AHA Coding Clinic® for HCPCS - 2022 Quarter 3; Ask the Editor
MOHs surgery with referral of special stains
A patient with a 1.2 x 0.6 cm squamous cell carcinoma of the right temple presented for Mohs micrographic surgery. At the initial stage, the tumor was debulked/excised along with the peripheral and deep margins. The tissue was mapped and color-coded. The microscopic examination revealed tumor persisting in the deep portion of the specimen; therefore, the patient required additional Mohs stages. In the final stage, stage IV, the surgeon’s microscopic examination of the specimen revealed no additional tumor however, due to perineural inflammation and concern for perineural tumor invasion, the surgeon melted down the tissue block and sent it for special stains to an outside facility. The final defect measured 2.5 x 2.1 cm and the patient was referred to plastic surgery for closure. Given Mohs codes may only be reported when the physician operates as both surgeon and pathologist, does sending tissue for special stains (after the surgeon has reviewed) negate the option for reporting codes from the Mohs surgery code range 17311 - 17315 ? What are the appropriate CPT codes the facility should report for this case? ...
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Article Overview
This article focuses on a Mohs surgery case and a coding question about what happens when tissue is sent for special stains after the surgeon has already performed microscopic review. It is relevant to coding professionals, dermatology practices, and billers who need to understand how pathology handling, staged surgery, and referral for closure may affect reporting. The article centers on a real-world scenario and frames the issue as a billing and coding interpretation question rather than a general clinical discussion.
Why This Topic Matters
Mohs cases often involve multiple steps and documentation nuances, so understanding whether later special-stain processing changes the reporting picture matters for compliant coding and claim accuracy. This is especially important when care is split across surgical, pathology, and referral services.
What You Will Learn
- How a Mohs surgery scenario with additional tissue processing is presented in a coding context
- Why outside special-stain handling can raise questions about service reporting
- How referral for closure may factor into the overall claim picture at a high level
- What kind of documentation issue can affect interpretation of a Mohs case
Who Should Read This
- Medical coders
- Billing staff
- Dermatology practices
- Mohs surgery practices
- Compliance professionals
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