Summary & Overview
CPT 17312: Mohs Micrographic Surgery for Skin Cancer in Sensitive Areas
CPT code 17312 represents the Mohs micrographic technique, a highly specialized surgical procedure for the treatment of skin cancers in anatomically sensitive or complex areas such as the head, neck, hands, feet, genitalia, or sites involving critical structures like muscle, cartilage, bone, tendon, major nerves, or vessels. This code encompasses the complete process of tumor removal, tissue mapping, color coding, and microscopic examination by the surgeon, along with histopathologic preparation using routine stains. Mohs surgery is recognized for its precision and tissue-sparing approach, making it a preferred method for managing skin cancers in challenging locations.
Nationally, this procedure is covered by major payers including Aetna, Blue Cross Blue Shield, Cigna Health, Medicare, and UnitedHealthcare. The publication provides a comprehensive overview of payer coverage, clinical benchmarks, and recent policy updates relevant to Mohs micrographic surgery. Readers will gain insight into the clinical context of the procedure, typical sites of service, and the importance of accurate coding for reimbursement and compliance. The analysis also highlights related codes and modifiers, offering clarity on billing practices and payer requirements for this complex dermatologic service.
CPT Code Overview
CPT code 17312 describes the Mohs micrographic technique, a specialized dermatologic surgical procedure used for the treatment of skin cancers. This procedure involves the removal of all visible tumor tissue, surgical excision of specimens, mapping and color coding of the excised tissue, and microscopic examination by the surgeon. Histopathologic preparation, including routine stains such as hematoxylin and eosin or toluidine blue, is also included. The code applies to procedures performed on the head, neck, hands, feet, genitalia, or any location where surgery directly involves muscle, cartilage, bone, tendon, major nerves, or vessels. Mohs micrographic surgery is most commonly performed in an outpatient setting, such as a physician's office.
Clinical & Coding Specifications
Clinical Context
A typical patient scenario involves an adult presenting to a dermatology clinic with a biopsy-confirmed diagnosis of basal cell carcinoma or squamous cell carcinoma located on the head, neck, hands, feet, genitalia, or an area where surgery directly involves muscle, cartilage, bone, tendon, major nerves, or vessels. The patient is scheduled for Mohs micrographic surgery, which is performed in an outpatient office setting. The procedure includes excision of the tumor, mapping and color coding of tissue specimens, and microscopic examination by the surgeon to ensure complete removal of cancerous cells. Multiple stages may be required depending on the extent of the tumor. The clinical workflow includes preoperative assessment, surgical excision, intraoperative histopathologic evaluation, and wound reconstruction as needed.
Coding Specifications
- Modifier
59: Used to indicate a distinct procedural service. This modifier is applied when Mohs micrographic surgery is performed on a separate lesion on the same day, as per CMS billing guidance.
| Modifier Code | Description |
|---|---|
59 | Distinct procedural service – when Mohs on separate lesion same day requires -59 modifier per CMS billing guidance |
- Provider Taxonomies: