ICD-10 Code C00.8 – Malignant neoplasm of overlapping sites of lip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C00.8 – Malignant neoplasm of overlapping sites of lip
What it is
C00.8 identifies a malignant tumor of the lip that involves overlapping anatomic sites, so the exact subsite cannot be assigned to one lip region. Use it for documented lip cancer spanning more than one adjoining area.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a persistent lip lesion, ulceration, induration, bleeding, or nonhealing mass, with diagnosis confirmed by pathology when available.
When to use this code
Use this code when the provider documents a malignant neoplasm of the lip involving overlapping sites, such as lesions crossing adjacent lip borders. It is appropriate when the record does not support a more specific lip subsite. Check documentation if the site is unclear or mixed with another oral location.
Do not use for
Do not use C00.8 for a lesion limited to a single, clearly identified lip subsite. Do not use it for benign lip lesions or for oral cavity cancers outside the lip.
Coding tip
Assign C00.8 only when the chart explicitly supports overlapping lip involvement and no more specific lip code applies.