ICD-10 Code C44.89 – Other specified malignant neoplasm of overlapping sites of skin (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.89 – Other specified malignant neoplasm of overlapping sites of skin
What it is
This code identifies a malignant skin tumor involving overlapping sites, when the record specifies a skin cancer but not a more exact site code. Use it when the documentation supports malignancy of skin across adjacent areas.
Clinical signs
Clinical features vary; refer to documentation. Skin cancers may present as a changing lesion, nonhealing sore, or abnormal growth, but the exact appearance depends on the pathology and location.
When to use this code
Use C44.89 when the provider documents a malignant neoplasm of overlapping skin sites and no more specific skin cancer code applies. It is appropriate when the lesion spans adjacent skin regions and the record does not support a single anatomic site. Check documentation if the diagnosis is described only broadly.
Do not use for
Do not use this code for benign skin lesions, in situ neoplasms, or unspecified skin cancer without overlap. If the site is more specific, code that location instead.
Coding tip
Confirm both malignancy and overlapping-site wording in the pathology or provider note before assigning C44.89.