Malignant neoplasm of floor of mouth (C04) ICD-10-CM
The C04 code range covers malignant neoplasm of floor of mouth with 5 ICD-10-CM diagnosis codes. 4 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 C04 Range 5 codes · 4 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the C04 range.
Malignant Floor of the Mouth Neoplasm
A primary or metastatic malignant neoplasm that affects the floor of the mouth. The majority of cases are carcinomas.
About the C04 Code Range
Cancer of the floor of the mouth can start there or spread there from elsewhere. C04 sits among cancers of the lip, oral cavity, and pharynx.
Its subdivisions distinguish the anterior (front) floor of the mouth, C04.0, from the lateral (side) floor, C04.1. They also identify overlapping sites, C04.8, or an unspecified part of the floor of the mouth, C04.9.
Questions About This Page
How many billable codes are in the C04 range?
Of the 5 codes in this range, 4 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 C04 range classify?
The range classifies malignant neoplasm of floor 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.
