U.S. ICD-10-CM · FY 2027

C79 ICD-10-CM Code: Secondary malignant neoplasm of other and unspecified sites

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

Code definition

Official description

C79

Secondary malignant neoplasm of other and unspecified sites

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

Classification

Where C79 sits

  1. 1

    Chapter 2

    Neoplasms (C00-D49)

  2. 2

    Section

    Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80)

  3. 3

    Category C79

    Secondary malignant neoplasm of other and unspecified sites

  4. 4

    Code C79

    Secondary malignant neoplasm of other and unspecified sites

More specific choices

Codes under C79

C79 is a non-billable category. Choose the child code that best matches the documented diagnosis.

C79.0

Secondary malignant neoplasm of kidney and renal pelvis

C79.1

Secondary malignant neoplasm of bladder and other and unspecified urinary organs

C79.2

Secondary malignant neoplasm of skin

C79.3

Secondary malignant neoplasm of brain and cerebral meninges

C79.4

Secondary malignant neoplasm of other and unspecified parts of nervous system

C79.5

Secondary malignant neoplasm of bone and bone marrow

C79.6

Secondary malignant neoplasm of ovary

C79.7

Secondary malignant neoplasm of adrenal gland

C79.8

Secondary malignant neoplasm of other specified sites

C79.9

Secondary malignant neoplasm of unspecified site

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for C79.

Code first

No “code first” instruction is listed for C79.

Use additional code

No “use additional code” instruction is listed for C79.

Excludes1

Conditions that should not be reported together with this code.

  • secondary carcinoid tumors (C7B.-)
  • secondary neuroendocrine tumors (C7B.-)

Excludes2

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

No Excludes2 note is listed for C79.

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 C79 mean?

C79 is the FY 2027 U.S. ICD-10-CM code for “Secondary malignant neoplasm of other and unspecified sites.”

Is C79 a billable or specific ICD-10-CM code?

No. C79 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 C79 located in ICD-10-CM?

C79 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80) (C76–C80), under category C79, Secondary malignant neoplasm of other and unspecified sites.

What coding notes are listed for C79?

No inclusion terms are listed for C79 in this reference record. No code-first instruction is listed. Excludes1 notes: secondary carcinoid tumors (C7B.-); secondary neuroendocrine tumors (C7B.-). No Excludes2 note is listed.

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