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 2027, 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
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the C06 range.
Malignant Buccal Mucosa Neoplasm
A primary or metastatic malignant neoplasm involving the buccal mucosa.
Malignant Oral Cavity Neoplasm
A primary or metastatic malignant neoplasm involving the oral cavity. The majority are squamous cell carcinomas.
About the C06 Code Range
These cancers affect other or unspecified parts of the mouth. The named sites include the cheek lining, the space between the teeth and lips or cheeks, and the area behind the molars.
C06 separates cancers by mouth site: C06.0 identifies the cheek lining, C06.1 the mouth vestibule, and C06.2 the area behind the molars. C06.8 identifies overlapping sites, divided into unspecified parts of the mouth at C06.80 and other parts at C06.89. C06.9 identifies an unspecified mouth site.
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, 2026 through September 30, 2027. 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 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
