2026 ICD-10-CM Diagnosis Code C03Malignant neoplasm of gum
C03 is a non-billable ICD-10-CM category code for malignant neoplasm of gum, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C03.0, C03.1, and C03.9.
Code Identity
Code Classification
Specific Coding for Malignant neoplasm of gumOverview
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Includes
- malignant neoplasm of alveolar (ridge) mucosa
- malignant neoplasm of gingiva
Use Additional Code
- code to identify:
- alcohol abuse and dependence F10
- history of tobacco dependence Z87.891
- tobacco dependence F17
- tobacco use Z72.0
Type 2 Excludes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Patient EducationClinical
Oral Cancer
Oral cancer is cancer of the mouth. It is a type of head and neck cancer. Most oral cancers are squamous cell cancers. They begin in the flat cells that cover the surfaces of your mouth, tongue, and lips. The cancer cells may spread into deeper tissue as the cancer grows.
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Read the full article at MedlinePlus
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