ICD-10 Code C02.1 – Malignant neoplasm of border of tongue (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C02.1 – Malignant neoplasm of border of tongue
What it is
C02.1 identifies a malignant tumor arising on the lateral border of the tongue. Use it when documentation specifies cancer of the tongue edge rather than another oral site.
Clinical signs
Typical findings include a persistent tongue ulcer, mass, pain, bleeding, or difficulty speaking or swallowing. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents primary malignancy of the tongue border, lateral tongue, or edge of tongue. It also fits pathology or operative reports that clearly localize the tumor to this site. If the record only says “tongue cancer” without a site, check documentation.
Do not use for
Do not use C02.1 for lesions of the tongue tip, base, or other oral cavity sites. Do not use it when the diagnosis is benign, uncertain, or metastatic to the tongue.
Coding tip
Verify the exact tongue subsite in the pathology, operative, or oncology note before assigning C02.1.