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C37 ICD-10-CM Code: Malignant neoplasm of thymus

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

Official description

C37

Malignant neoplasm of thymus

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

Where C37 sits

  1. 1

    Chapter 2

    Neoplasms (C00-D49)

  2. 2

    Section

    Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)

  3. 3

    Category C37

    Malignant neoplasm of thymus

  4. 4

    Code C37

    Malignant neoplasm of thymus

Notes for this code

Inclusion terms

No inclusion terms are listed for C37.

Code first

No “code first” instruction is listed for C37.

Use additional code

No “use additional code” instruction is listed for C37.

Excludes1

Conditions that should not be reported together with this code.

  • malignant carcinoid tumor of the thymus (C7A.091)

Excludes2

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

No Excludes2 note is listed for C37.

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 C37 mean?

C37 is the FY 2027 U.S. ICD-10-CM code for “Malignant neoplasm of thymus.”

Is C37 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, C37 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 C37 located in ICD-10-CM?

C37 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of respiratory and intrathoracic organs (C30-C39) (C30–C39), under category C37, Malignant neoplasm of thymus.

What coding notes are listed for C37?

No inclusion terms are listed for C37 in this reference record. No code-first instruction is listed. Excludes1 notes: malignant carcinoid tumor of the thymus (C7A.091). No Excludes2 note is listed.