ICD-10 Code C02.3 – Malignant neoplasm of anterior two-thirds of tongue, part unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C02.3 – Malignant neoplasm of anterior two-thirds of tongue, part unspecified
What it is
This code identifies a malignant tumor of the front two-thirds of the tongue when the exact subsite is not specified. Use it for primary oral tongue cancer documented in the anterior portion without further detail.
Clinical signs
Common findings include a persistent tongue ulcer, mass, pain, bleeding, or difficulty speaking or swallowing. Clinical features vary; refer to documentation for the exact site and pathology.
When to use this code
Use C02.3 when the record states cancer of the anterior two-thirds of the tongue but does not name the lateral border, ventral surface, or another specific part. It also fits when pathology confirms malignancy and the documentation remains nonspecific. Do not infer a more detailed site without support.
Do not use for
Do not use this code for malignant neoplasms of the base of tongue or other oral cavity sites. Check documentation if the lesion is described as posterior tongue, unspecified tongue, or a secondary/metastatic tumor.
Coding tip
Assign the most specific tongue subsite documented; if the anterior two-thirds is named but the part is not, C02.3 is appropriate.