C04: Malignant neoplasm of floor of mouth
Codes under C04 (Malignant neoplasm of floor of mouth). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| C04.0 | Malignant neoplasm of anterior floor of mouth | ✓ |
| C04.0 | Malignant neoplasm of anterior floor of mouth | ✓ |
| C04.1 | Malignant neoplasm of lateral floor of mouth | ✓ |
| C04.1 | Malignant neoplasm of lateral floor of mouth | ✓ |
| C04.8 | Malignant neoplasm of overlapping sites of floor of mouth | ✓ |
| C04.8 | Malignant neoplasm of overlapping sites of floor of mouth | ✓ |
| C04.9 | Malignant neoplasm of floor of mouth, unspecified | ✓ |
| C04.9 | Malignant neoplasm of floor of mouth, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code C04?
C04 is an ICD-10-CM category covering Malignant neoplasm of floor of mouth. It contains 8 more specific diagnosis codes, 8 of which are billable.
Is C04 a billable code?
No — C04 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example C04.0 — Malignant neoplasm of anterior floor of mouth). 8 of the 8 codes under C04 are billable.
What codes fall under C04?
C04 includes C04.0, C04.0, C04.1, C04.1, C04.8, plus 3 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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