C00: Malignant neoplasm of lip
Codes under C00 (Malignant neoplasm of lip). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| C00.0 | Malignant neoplasm of external upper lip | ✓ |
| C00.0 | Malignant neoplasm of external upper lip | ✓ |
| C00.1 | Malignant neoplasm of external lower lip | ✓ |
| C00.1 | Malignant neoplasm of external lower lip | ✓ |
| C00.2 | Malignant neoplasm of external lip, unspecified | ✓ |
| C00.2 | Malignant neoplasm of external lip, unspecified | ✓ |
| C00.3 | Malignant neoplasm of upper lip, inner aspect | ✓ |
| C00.3 | Malignant neoplasm of upper lip, inner aspect | ✓ |
| C00.4 | Malignant neoplasm of lower lip, inner aspect | ✓ |
| C00.4 | Malignant neoplasm of lower lip, inner aspect | ✓ |
| C00.5 | Malignant neoplasm of lip, unspecified, inner aspect | ✓ |
| C00.5 | Malignant neoplasm of lip, unspecified, inner aspect | ✓ |
| C00.6 | Malignant neoplasm of commissure of lip, unspecified | ✓ |
| C00.6 | Malignant neoplasm of commissure of lip, unspecified | ✓ |
| C00.8 | Malignant neoplasm of overlapping sites of lip | ✓ |
| C00.8 | Malignant neoplasm of overlapping sites of lip | ✓ |
| C00.9 | Malignant neoplasm of lip, unspecified | ✓ |
| C00.9 | Malignant neoplasm of lip, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code C00?
C00 is an ICD-10-CM category covering Malignant neoplasm of lip. It contains 18 more specific diagnosis codes, 18 of which are billable.
Is C00 a billable code?
No — C00 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 C00.0 — Malignant neoplasm of external upper lip). 18 of the 18 codes under C00 are billable.
What codes fall under C00?
C00 includes C00.0, C00.0, C00.1, C00.1, C00.2, plus 13 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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