ICD-10 Code C44.80 – Unspecified malignant neoplasm of overlapping sites of skin (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.80 – Unspecified malignant neoplasm of overlapping sites of skin
What it is
C44.80 identifies a malignant skin tumor involving overlapping sites, but the record does not specify the exact skin location. Use it when documentation confirms skin cancer and the site is not described more precisely.
Clinical signs
Clinical features vary; refer to documentation. Skin cancers may appear as a nonhealing lesion, changing pigmented area, ulcer, or abnormal growth, but the diagnosis should be supported by pathology or clinician assessment.
When to use this code
Use this code when the provider documents a malignant neoplasm of skin at overlapping sites and does not name a more specific anatomic site. It is appropriate when the chart lacks enough detail to assign a more exact skin code. Check documentation if the lesion spans multiple adjacent areas.
Do not use for
Do not use it for benign skin lesions, carcinoma in situ, or malignant neoplasms with a clearly documented specific site. If the record identifies the exact body location, select the more specific code.
Coding tip
Query the provider when the site is unclear, because a more specific skin code is usually available.