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C00 ICD-10-CM Code: Malignant neoplasm of lip

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Official description

C00

Malignant neoplasm of lip

ICD-10-CM diagnosis code · United States clinical modification

Where C00 sits

  1. 1

    Chapter 2

    Neoplasms (C00-D49)

  2. 2

    Section

    Malignant neoplasms of lip, oral cavity and pharynx (C00-C14)

  3. 3

    Category C00

    Malignant neoplasm of lip

  4. 4

    Code C00

    Malignant neoplasm of lip

Codes under C00

C00 is a non-billable category. Choose the child code that best matches the documented diagnosis.

C00.0Malignant neoplasm of external upper lipC00.1Malignant neoplasm of external lower lipC00.2Malignant neoplasm of external lip, unspecifiedC00.3Malignant neoplasm of upper lip, inner aspectC00.4Malignant neoplasm of lower lip, inner aspectC00.5Malignant neoplasm of lip, unspecified, inner aspectC00.6Malignant neoplasm of commissure of lip, unspecifiedC00.8Malignant neoplasm of overlapping sites of lipC00.9Malignant neoplasm of lip, unspecified

Notes for this code

Inclusion terms

No inclusion terms are listed for C00.

Code first

No “code first” instruction is listed for C00.

Use additional code

  • code to identify:
  • alcohol abuse and dependence (F10.-)
  • history of tobacco dependence (Z87.891)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Excludes1

Conditions that should not be reported together with this code.

  • malignant melanoma of lip (C43.0)
  • Merkel cell carcinoma of lip (C4A.0)
  • other and unspecified malignant neoplasm of skin of lip (C44.0-)

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for C00.

Source and release

Data release
U.S. ICD-10-CM · FY 2027
Effective date
Oct 1, 2026

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Frequently asked questions

What does ICD-10-CM code C00 mean?

C00 is the FY 2027 U.S. ICD-10-CM code for “Malignant neoplasm of lip.”

Is C00 a billable or specific ICD-10-CM code?

No. C00 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is C00 located in ICD-10-CM?

C00 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of lip, oral cavity and pharynx (C00-C14) (C00–C14), under category C00, Malignant neoplasm of lip.

What coding notes are listed for C00?

No inclusion terms are listed for C00 in this reference record. No code-first instruction is listed. Additional-code instructions: code to identify:; alcohol abuse and dependence (F10.-); history of tobacco dependence (Z87.891); tobacco dependence (F17.-); tobacco use (Z72.0). Excludes1 notes: malignant melanoma of lip (C43.0); Merkel cell carcinoma of lip (C4A.0); other and unspecified malignant neoplasm of skin of lip (C44.0-). No Excludes2 note is listed.