Billing and Coding: Mohs Micrographic Surgery (MMS)

Mohs Micrographic Surgery (MMS) is covered for complex or ill-defined malignant skin neoplasms—particularly at critical facial sites—when 100% margin examination and a single surgeon acting as both surgeon and pathologist are performed. Facilities must hold an appropriate CLIA certificate to bill MMS; separate same-day biopsy/pathology payment is allowed only with proper modifiers and documentation (including no biopsy of the MMS lesion within 60 days or a different lesion), and extensive operative, histologic, and counseling documentation is required to support billing.

"Mohs Micrographic Surgery (MMS) is indicated for removal of complex or ill-defined malignant neoplasms of the skin requiring histopathologic examination of 100% of surgical margins."

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