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C19 ICD-10-CM Code: Malignant neoplasm of rectosigmoid junction

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

Official description

C19

Malignant neoplasm of rectosigmoid junction

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

Where C19 sits

  1. 1

    Chapter 2

    Neoplasms (C00-D49)

  2. 2

    Section

    Malignant neoplasms of digestive organs (C15-C26)

  3. 3

    Category C19

    Malignant neoplasm of rectosigmoid junction

  4. 4

    Code C19

    Malignant neoplasm of rectosigmoid junction

Notes for this code

Inclusion terms

  • Malignant neoplasm of colon with rectum
  • Malignant neoplasm of rectosigmoid (colon)

Code first

No “code first” instruction is listed for C19.

Use additional code

No “use additional code” instruction is listed for C19.

Excludes1

Conditions that should not be reported together with this code.

  • malignant carcinoid tumors of the colon (C7A.02-)

Excludes2

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

No Excludes2 note is listed for C19.

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 C19 mean?

C19 is the FY 2027 U.S. ICD-10-CM code for “Malignant neoplasm of rectosigmoid junction.”

Is C19 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, C19 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 C19 located in ICD-10-CM?

C19 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of digestive organs (C15-C26) (C15–C26), under category C19, Malignant neoplasm of rectosigmoid junction.

What coding notes are listed for C19?

Its listed inclusion terms are Malignant neoplasm of colon with rectum; Malignant neoplasm of rectosigmoid (colon). No code-first instruction is listed. Excludes1 notes: malignant carcinoid tumors of the colon (C7A.02-). No Excludes2 note is listed.