U.S. ICD-10-CM · FY 2027

C01 ICD-10-CM Code: Malignant neoplasm of base of tongue

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

Code definition

Official description

C01

Malignant neoplasm of base of tongue

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

Classification

Where C01 sits

  1. 1

    Chapter 2

    Neoplasms (C00-D49)

  2. 2

    Section

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

  3. 3

    Category C01

    Malignant neoplasm of base of tongue

  4. 4

    Code C01

    Malignant neoplasm of base of tongue

Documentation details

Notes for this code

Inclusion terms

  • Malignant neoplasm of dorsal surface of base of tongue
  • Malignant neoplasm of fixed part of tongue NOS
  • Malignant neoplasm of posterior third of tongue

Code first

No “code first” instruction is listed for C01.

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.

No Excludes1 note is listed for C01.

Excludes2

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

No Excludes2 note is listed for C01.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

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

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code C01 mean?

C01 is the FY 2027 U.S. ICD-10-CM code for “Malignant neoplasm of base of tongue.”

Is C01 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, C01 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.

Where is C01 located in ICD-10-CM?

C01 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of lip, oral cavity and pharynx (C00-C14) (C00–C14), under category C01, Malignant neoplasm of base of tongue.

What coding notes are listed for C01?

Its listed inclusion terms are Malignant neoplasm of dorsal surface of base of tongue; Malignant neoplasm of fixed part of tongue NOS; Malignant neoplasm of posterior third of tongue. 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). No Excludes1 note is listed. No Excludes2 note is listed.

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