ICD-10 Code C44.8 – Other and unspecified malignant neoplasm of overlapping sites of skin (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.8 – Other and unspecified malignant neoplasm of overlapping sites of skin
What it is
This code identifies a malignant skin cancer that involves overlapping sites, meaning the tumor spans more than one adjacent skin area and cannot be assigned to a single specific site. Use it when the record documents overlap or an unspecified overlapping skin location.
Clinical signs
Clinical features vary; refer to documentation. Malignant skin lesions may present as a persistent enlarging lesion, nonhealing ulcer, bleeding, crusting, or a changing pigmented or raised area.
When to use this code
Use C44.8 when the provider documents a malignant neoplasm of skin involving overlapping sites and does not name one exact anatomic site. It also fits cases where the site is described as overlapping but remains otherwise unspecified. Check the pathology, operative note, or assessment for the exact wording before coding.
Do not use for
Do not use this code for benign skin lesions, carcinoma in situ, or melanoma. If the documentation names a single skin site, code that specific location instead.
Coding tip
Code the most specific skin site documented; use C44.8 only when the lesion truly spans overlapping areas or the record does not allow a more precise site.