D00.06
BillableCarcinoma in situ of floor of mouth
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
This is an early stage of cancer development in the floor of the mouth (the tissue under the tongue) where abnormal cells are present but have not yet invaded deeper tissues or spread to other parts of the body. It is considered a precancerous condition that requires monitoring and treatment to prevent progression to invasive cancer.
Coding Tips
- •Verify documentation specifies the floor of mouth location, as carcinoma in situ codes are site-specific and D00.06 is distinct from other oral cavity sites like D00.02 (lip) or D00.03 (gum)
- •Confirm the diagnosis states 'carcinoma in situ' or 'CIS' rather than invasive carcinoma, as this distinction is critical for accurate code selection and treatment planning
Code Hierarchy
└D00Carcinoma in situ of oral cavity, esophagus and stomach└D00.0Carcinoma in situ of lip, oral cavity and pharynx└D00.06Carcinoma in situ of floor of mouth
└D00.06Carcinoma in situ of floor of mouth