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C00.3

C00.3Malignant neoplasm of upper lip, inner aspect

Billable / specific codeICD-10-CM

C00.3 is a billable, specific ICD-10-CM code for malignant neoplasm of upper lip, inner aspect. It is valid for submission on a claim.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Malignant neoplasm of buccal aspect of upper lip
  • Malignant neoplasm of frenulum of upper lip
  • Malignant neoplasm of mucosa of upper lip
  • Malignant neoplasm of oral aspect of upper lip

Risk adjustment

C00.3 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

C00.3 is named in 62 Medicare coverage policies 62 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

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Related codes at this level

Codes that share C00. If C00.3 is not quite right, the correct code is usually one of these.

Questions about C00.3

Is C00.3 a billable ICD-10-CM code?
Yes. C00.3 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does C00.3 sit in the tabular list?
Neoplasms (C00-D49), in the block Malignant neoplasms of lip, oral cavity and pharynx (C00-C14).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.