U.S. ICD-10-CM · FY 2027

C20 ICD-10-CM Code: Malignant neoplasm of rectum

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

Code definition

Official description

C20

Malignant neoplasm of rectum

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

Classification

Where C20 sits

  1. 1

    Chapter 2

    Neoplasms (C00-D49)

  2. 2

    Section

    Malignant neoplasms of digestive organs (C15-C26)

  3. 3

    Category C20

    Malignant neoplasm of rectum

  4. 4

    Code C20

    Malignant neoplasm of rectum

Documentation details

Notes for this code

Inclusion terms

  • Malignant neoplasm of rectal ampulla

Code first

No “code first” instruction is listed for C20.

Use additional code

No “use additional code” instruction is listed for C20.

Excludes1

Conditions that should not be reported together with this code.

  • malignant carcinoid tumor of the rectum (C7A.026)

Excludes2

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

No Excludes2 note is listed for C20.

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 C20 mean?

C20 is the FY 2027 U.S. ICD-10-CM code for “Malignant neoplasm of rectum.”

Is C20 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, C20 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 C20 located in ICD-10-CM?

C20 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of digestive organs (C15-C26) (C15–C26), under category C20, Malignant neoplasm of rectum.

What coding notes are listed for C20?

Its listed inclusion terms are Malignant neoplasm of rectal ampulla. No code-first instruction is listed. Excludes1 notes: malignant carcinoid tumor of the rectum (C7A.026). No Excludes2 note is listed.

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