C79
C79: Secondary malignant neoplasm of other and unspecified sites
Non-billable headerICD-10-CM
C79 is a non-billable header ICD-10-CM code for secondary malignant neoplasm of other and unspecified sites. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- secondary carcinoid tumors (C7B.-)
- secondary neuroendocrine tumors (C7B.-)
Other codes that can never be billed with C79
Their own Excludes1 notes name this code, so the conflict is not listed above.
- C80.1Malignant (primary) neoplasm, unspecified
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead C79
10 child codes. Green means billable.
- C79.0Secondary malignant neoplasm of kidney and renal pelvis
- C79.1Secondary malignant neoplasm of bladder and other and unspecified urinary organs
- C79.2Secondary malignant neoplasm of skin
- C79.3Secondary malignant neoplasm of brain and cerebral meninges
- C79.4Secondary malignant neoplasm of other and unspecified parts of nervous system
- C79.5Secondary malignant neoplasm of bone and bone marrow
- C79.6Secondary malignant neoplasm of ovary
- C79.7Secondary malignant neoplasm of adrenal gland
- C79.8Secondary malignant neoplasm of other specified sites
- C79.9Secondary malignant neoplasm of unspecified site