R081 – Mohs micrographic surgery - initial cut
OHIP Radiology Code — INTEGUMENTARY SYSTEM SURGICAL PROCEDURES · Schedule of Benefits
Mohs micrographic surgery is eligible for payment when rendered for a lesion that is a histologically confirmed cutaneous malignancy (including basal cell carcinoma, squamous cell carcinoma, malignant melanoma, lentigo maligna, dermatofibrosarcoma protuberans, sebaceous carcinoma, microcystic adnexal carcinoma, atypical fibroxanthoma, Merkel cell carcinoma, eccrine carcinoma, extramammary Paget's disease, leiomyosarcoma and primary cutaneous adenocarcinoma); and that meets one or more of the following conditions: a. a lesion with clinical margins greater than 1.5 cm; b. a lesion located in an anatomically sensitive area, in particular but not limited to the periocular, perinasal, perilabial, and periauricular surfaces, or the nose; c. a recurrent malignancy that has not responded to prior therapy; d. a malignant lesion in a patient with immunodeficiency or genodermatoses predisposing to widespread skin cancers, such as basal cell nevus syndrome; e. a histologically aggressive lesion (such as a basal cell carcinoma that is sclerosing, infiltrative, baso-squamous, or micronodular, or a squamous cell carcinoma that is poorly differentiated, or demonstrates peri-neural/lymphatic/vascular involvement) at any anatomic site.
When to Use
- Use R081 for the initial stage of Mohs micrographic surgery on a histologically confirmed malignancy located in high-risk areas like the nose, periocular, or perinasal regions.
- Use R081 for treating histologically aggressive tumors, such as infiltrative or micronodular basal cell carcinoma, where standard excision margins are insufficient.
- Use R081 for recurrent malignancies that have failed prior treatment, provided the physician personally interprets the microscopic tissue sections.
Common Pitfalls
- Billing R081 when a pathologist is involved in the interpretation or slide analysis, which triggers an automatic rejection; in these cases, you must bill standard excision codes instead.
- Failing to document the specific 'aggressive' histological features or the anatomical 'sensitive area' criteria, which are mandatory for audit compliance under the Schedule of Benefits.
- Attempting to bill R081 for standard excisions that do not involve the specific Mohs micrographic technique of mapping and staged microscopic control.
Billing Tips
- Ensure the medical record explicitly states that you personally reviewed and interpreted all microscopic sections, as this is a hard requirement for R081 eligibility.
- Remember that simple undermining and advancement flaps are bundled into R081; only bill additional skin flap or graft codes if the closure complexity exceeds these standard techniques.
Effective: April 1, 2025
M. Integumentary System Surgical Procedures
INTEGUMENTARY SYSTEM SURGICAL PROCEDURES
Surgical
Integumentary System Surgical Procedures
The physician claiming R081 must have generally accepted specialized training in Mohs surgery.
The medical record must contain documentation of a histologically confirmed cutaneous malignancy.
The medical record must document that the lesion meets one of the required conditions (e.g., size, location, recurrence, histology).
All microscopic tissue sections must be personally reviewed and interpreted by the physician claiming R081.
The preparation of slides must be rendered or supervised by the physician claiming R081.
1. R081 and E524 are eligible for payment only to physicians with generally accepted specialized training in Mohs surgery.
2. R081 is eligible for payment only when the preparation of slides is rendered or supervised by the physician claiming R081 and all microscopic tissue sections are personally reviewed and interpreted by the physician claiming R081. If a pathologist interprets or submits a claim for analyzing histological slides prepared by the physician claiming R081, R081 and E524 are not eligible for payment.
3. Closure of the resulting defect by undermining and advancement flaps is included in the above fees. If more complicated closure is necessary, the service may be eligible for payment using fee codes under skin flaps and grafts.
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