C00.9 ICD-10-CM Code: Malignant neoplasm of lip, unspecified
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 011 — TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITH MCC (MDC PRE)
- MS-DRG 012 — TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITH CC (MDC PRE)
- MS-DRG 013 — TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITHOUT CC/MCC (MDC PRE)
- MS-DRG 146 — EAR, NOSE, MOUTH AND THROAT MALIGNANCY WITH MCC (MDC 03)
- MS-DRG 147 — EAR, NOSE, MOUTH AND THROAT MALIGNANCY WITH CC (MDC 03)
- MS-DRG 148 — EAR, NOSE, MOUTH AND THROAT MALIGNANCY WITHOUT CC/MCC (MDC 03)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for C00.9 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- malignant melanoma of lip (C43.0)
- Merkel cell carcinoma of lip (C4A.0)
- other and unspecified malignant neoplasm of skin of lip (C44.0-)
Use Additional Code
Supplementary codes the tabular list directs you to add.
- Use additional code to identify:
- alcohol abuse and dependence (F10.-)
- history of tobacco dependence (Z87.891)
- tobacco dependence (F17.-)
- tobacco use (Z72.0)
Nearest Codes in This Family
Official ICD-10-CM classifications closest to C00.9 in its code family, with their registry titles.
- C00 — Malignant neoplasm of lip
- C00.0 — Malignant neoplasm of external upper lip
- C00.1 — Malignant neoplasm of external lower lip
- C00.2 — Malignant neoplasm of external lip, unspecified
- C00.3 — Malignant neoplasm of upper lip, inner aspect
- C00.4 — Malignant neoplasm of lower lip, inner aspect
- C00.5 — Malignant neoplasm of lip, unspecified, inner aspect
- C00.6 — Malignant neoplasm of commissure of lip, unspecified
- C00.8 — Malignant neoplasm of overlapping sites of lip
Neoplasm Table Sites (2)
Anatomical sites from the official ICD-10-CM Table of Neoplasms that map to this code, with the matching behavior column.
- Neoplasm, neoplastic, labial — Malignant, Primary
- Neoplasm, neoplastic, lip — Malignant, Primary