ICD-10 Code C44.510 – Basal cell carcinoma of anal skin (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.510 – Basal cell carcinoma of anal skin
What it is
This code identifies a basal cell carcinoma arising in the skin of the anal region. Use it when documentation specifically states a basal cell malignant skin lesion at that site.
Clinical signs
Basal cell carcinoma often appears as a slow-growing, pearly, or ulcerated skin lesion that may bleed easily. Clinical features vary; refer to documentation.
When to use this code
Use C44.510 when the record clearly documents basal cell carcinoma of the anal skin or anal region skin. It is appropriate for pathology-confirmed or clinician-documented cases tied to that exact location. Check documentation if the note only says perianal, anal canal, or unspecified skin cancer.
Do not use for
Do not use this code for squamous cell carcinoma, melanoma, or nonmalignant anal skin lesions. Do not assign it when the site is not skin or when the documentation is too vague.
Coding tip
Match the histology and anatomic site exactly; if either is unclear, query the provider.