ICD-10-CM > C00-D49 > C43-C44 > C44 > C44.9 C44.9 Other and unspecified malignant neoplasm of skin, unspecified Non-Billable/Non-Specific Codes C44.90Unspecified malignant neoplasm of skin, unspecifiedC44.91Basal cell carcinoma of skin, unspecifiedC44.92Squamous cell carcinoma of skin, unspecifiedC44.99Other specified malignant neoplasm of skin, unspecified