Malignant neoplasm of other and unspecified parts of mouth (C06) ICD-10-CM
The C06 code range covers malignant neoplasm of other and unspecified parts of mouth with 8 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Use Additional Code
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.
Codes in the C06 Range 8 codes · 6 billable
- C06 Malignant neoplasm of other and unspecified parts of mouthNon-billable
- C06.0 Malignant neoplasm of cheek mucosa
- C06.1 Malignant neoplasm of vestibule of mouth
- C06.2 Malignant neoplasm of retromolar area
- C06.8 Malignant neoplasm of overlapping sites of other and unspecified parts of mouthNon-billable
- C06.80 Malignant neoplasm of overlapping sites of unspecified parts of mouth
- C06.89 Malignant neoplasm of overlapping sites of other parts of mouth
- C06.9 Malignant neoplasm of mouth, unspecified
About the C06 Code Range
The ICD-10 code C06 and its subcodes classify malignant neoplasms occurring in various specific and unspecified parts of the mouth. These codes are essential for accurately identifying and documenting cancers in locations like the cheek mucosa, vestibule, and retromolar area.
This ICD-10 code for malignant neoplasm of other and unspecified parts of mouth includes subcategories such as C06.0 for cheek mucosa tumors, often referred to by synonyms like squamous cell carcinoma of buccal mucosa or carcinoma of cheek. Code C06.1 covers cancers of the vestibule of mouth, which can be described using terms like primary carcinoma of upper or lower buccal sulcus or malignant tumor of the vestibule. The C06.2 code is for malignancies in the retromolar area, also known as carcinoma of the retromolar region. Unspecified and overlapping site tumors fall under C06.8, C06.80, and C06.89. Meanwhile, C06.9 is used for malignant neoplasms of the mouth when the exact location is unknown, with related terms including squamous cell carcinoma of mouth, neoplasm of minor salivary gland, and verrucous carcinoma of oral cavity. These codes help healthcare professionals and coders precisely document varied mouth cancers for treatment, research, and billing.
Questions About This Page
How many billable codes are in the C06 range?
Of the 8 codes in this range, 6 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the C06 range classify?
The range classifies malignant neoplasm of other and unspecified parts of mouth. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
