ICD-10 Code C03.9 – Malignant neoplasm of gum, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C03.9 – Malignant neoplasm of gum, unspecified
What it is
C03.9 identifies a malignant tumor of the gum when the exact site within the gum is not documented. Use it for oral cancer involving gingival tissue without further anatomic detail.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a persistent gum mass, ulceration, bleeding, pain, or loosening teeth, but you should code only what is documented.
When to use this code
Use C03.9 when the provider documents a malignant neoplasm of the gum and does not specify upper or lower gum, anterior or posterior site, or another more precise gingival location. It is also appropriate when the record confirms gingival cancer but the exact subsite remains unspecified.
Do not use for
Do not use this code for benign gum lesions, dysplasia, or cancers clearly documented at another oral site. Check documentation if the tumor is described as arising from the lip, tongue, palate, or other oral cavity structures.
Coding tip
Review pathology, operative notes, and oncology documentation for a more specific gingival site before assigning the unspecified code.