Coding and coverage · ICD-10-CM

C00 Malignant neoplasm of lip

Not billable (header)Chapter 2

Report one of the more specific codes below.

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Codes under this one

  • 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
  • C00.9 Malignant neoplasm of lip, unspecified

Instructional notes

Chapter 2

Notes
  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • 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 codeAdd a second code for the full picture.
  • code to identify:
  • alcohol abuse and dependence (F10.-)
  • history of tobacco dependence (Z87.891)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Chapter 2: Neoplasms · C00-C96 Malignant neoplasms (C00-C96)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.