ICD-10 Code C44.9 – Other and unspecified malignant neoplasm of skin, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.9 – Other and unspecified malignant neoplasm of skin, unspecified
What it is
C44.9 identifies a malignant skin tumor when the site or specific skin cancer type is not documented. Use it for skin cancers that are clearly malignant, but not further specified in the record.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the record may describe a suspicious skin lesion, biopsy-confirmed malignancy, or a skin cancer diagnosis without a more specific anatomic site.
When to use this code
Use C44.9 when the provider documents a malignant neoplasm of the skin and does not specify the exact skin location or subtype. It also fits when the chart confirms skin cancer, but details are missing after review. Code to a more specific C44 category if the site is documented.
Do not use for
Do not use this code for benign skin lesions, in situ skin cancers, or non-skin malignancies that have spread to the skin. Check documentation if the lesion is described only as suspicious or unconfirmed.
Coding tip
Query for the exact site and histology before assigning C44.9, because more specific skin cancer codes are often available.