ICD-10 Code D04.8 – Carcinoma in situ of skin of other sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D04.8 – Carcinoma in situ of skin of other sites
What it is
D04.8 identifies carcinoma in situ limited to the epidermis at skin sites other than the specifically listed locations. It indicates a noninvasive malignant lesion that has not breached the basement membrane.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the lesion is a persistent scaly, crusted, or erythematous skin change, sometimes with a plaque or nonhealing area that prompts biopsy.
When to use this code
Use this code when the provider documents carcinoma in situ of the skin and the site is not covered by a more specific D04 code. It is appropriate after pathology confirms an in situ lesion. If the record names a specific anatomic site, code that site instead.
Do not use for
Do not use D04.8 for invasive skin cancer, uncertain behavior, or benign lesions. If documentation is incomplete about the site or diagnosis, check documentation before assigning the code.
Coding tip
Match the pathology report and site description carefully; when a more specific D04 code applies, choose it instead of D04.8.