ICD-10 Code C44.91 – Basal cell carcinoma of skin, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.91 – Basal cell carcinoma of skin, unspecified
What it is
C44.91 identifies basal cell carcinoma of the skin when the site is not specified in the record. Use it for a confirmed basal cell skin cancer without a more precise anatomic location.
Clinical signs
Typical findings include a slow-growing skin lesion, often pearly or translucent, with possible ulceration or rolled borders. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents basal cell carcinoma but does not name the exact skin site. It also fits cases where the lesion is confirmed as basal cell carcinoma and the chart lacks a more specific location. If the site is documented, choose the more specific code instead.
Do not use for
Do not use C44.91 for other skin cancers, such as squamous cell carcinoma or melanoma. Do not use it when the record specifies a different body site or a more detailed basal cell carcinoma code.
Coding tip
Check the pathology or provider note for the exact lesion site before assigning this unspecified code.