Actinic keratosis

This code represents a precancerous skin lesion characterized by rough, scaly patches that develop on sun-exposed areas of the body. It is a common manifestation of chronic sun damage and indicates an increased risk for squamous cell carcinoma.

Use this code when documentation confirms a diagnosis of actinic keratosis, often identified during a dermatological examination. This code is appropriate for initial diagnoses, follow-up visits, and when treating or monitoring these lesions. Supporting documentation includes physician notes describing the characteristic appearance, location, and diagnosis.

• Do not confuse with seborrheic keratosis (L82.x), which is a benign growth.
• Specify the site of the actinic keratosis if known, using additional codes from the L57.x series (e.g., L57.1 for actinic cheilitis).
• If a biopsy is performed and reveals squamous cell carcinoma in situ, code the carcinoma (D04.x) instead.