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.
Official description
C79Secondary malignant neoplasm of other and unspecified sites
ICD-10-CM diagnosis code · United States clinical modification
Where C79 sits
- 1
Chapter 2
Neoplasms (C00-D49)
- 2
Section
Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80)
- 3
Category C79
Secondary malignant neoplasm of other and unspecified sites
- 4
Code C79
Secondary malignant neoplasm of other and unspecified sites
Codes under C79
C79 is a non-billable category. Choose the child code that best matches the documented diagnosis.
C79.0Secondary malignant neoplasm of kidney and renal pelvisC79.1Secondary malignant neoplasm of bladder and other and unspecified urinary organsC79.2Secondary malignant neoplasm of skinC79.3Secondary malignant neoplasm of brain and cerebral meningesC79.4Secondary malignant neoplasm of other and unspecified parts of nervous systemC79.5Secondary malignant neoplasm of bone and bone marrowC79.6Secondary malignant neoplasm of ovaryC79.7Secondary malignant neoplasm of adrenal glandC79.8Secondary malignant neoplasm of other specified sitesC79.9Secondary malignant neoplasm of unspecified siteNotes 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.
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.
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.