C79.9
ICD-10BillableSecondary malignant neoplasm of unspecified site
Official ICD-10-CM descriptor (FY2026)
Secondary malignant neoplasm of unspecified site
C79.9 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Metastatic cancer NOS
- Metastatic disease NOS
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- carcinomatosis NOS (C80.0)
- generalized cancer NOS (C80.0)
- malignant (primary) neoplasm of unspecified site (C80.1)
Related codes in C79
- C79.0Secondary malignant neoplasm of kidney and renal pelviscategory
- C79.1Sec malig neoplm of bladder and oth and unsp urinary organscategory
- C79.2Secondary malignant neoplasm of skin
- C79.3Secondary malignant neoplasm of brain and cerebral meningescategory
- C79.4Secondary malig neoplasm of and unsp parts of nervous syscategory
- C79.5Secondary malignant neoplasm of bone and bone marrowcategory
- C79.6Secondary malignant neoplasm of ovarycategory
- C79.7Secondary malignant neoplasm of adrenal glandcategory
- C79.8Secondary malignant neoplasm of other specified sitescategory
Where this code sits
- Chapter
- 2. Neoplasms (C00-D49)
- Parent code
- C79
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.