C79 – Secondary malignant neoplasm of other and unspecified sites
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of ill-defined, other secondary and unspecified sites
ICD-10-CM code
C79
- Code
C79(claims format:C79)- Description
- Secondary malignant neoplasm of other and unspecified sites
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 2. Neoplasms (C00-D49)
- Block
- C76-C80 Malignant neoplasms of ill-defined, other secondary and unspecified sites
Billable codes under C79
C79 is a header code and cannot be used on claims. Choose the most specific code:
- C79.0 – Secondary malignant neoplasm of kidney and renal pelvisHeader (more codes below)
- C79.1 – Secondary malignant neoplasm of bladder and other and unspecified urinary organsHeader (more codes below)
- C79.2 – Secondary malignant neoplasm of skinBillable
- C79.3 – Secondary malignant neoplasm of brain and cerebral meningesHeader (more codes below)
- C79.4 – Secondary malignant neoplasm of other and unspecified parts of nervous systemHeader (more codes below)
- C79.5 – Secondary malignant neoplasm of bone and bone marrowHeader (more codes below)
- C79.6 – Secondary malignant neoplasm of ovaryHeader (more codes below)
- C79.7 – Secondary malignant neoplasm of adrenal glandHeader (more codes below)
- C79.8 – Secondary malignant neoplasm of other specified sitesHeader (more codes below)
- C79.9 – Secondary malignant neoplasm of unspecified siteBillable
Notes for C79
Frequently asked questions
What is ICD-10 code C79?
C79 is the ICD-10-CM code for secondary malignant neoplasm of other and unspecified sites, in the block C76-C80 (Malignant neoplasms of ill-defined, other secondary and unspecified sites).
Is C79 a billable code?
No. C79 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.