C79 — Secondary malignant neoplasm of other and unspecified sites

Not billable

Is C79 billable?

No — C79 is a non-billable header code. C79 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 25 billable codes beneath C79.

Billable codes under this header

C79 at a glance

Code	C79
Description	Secondary malignant neoplasm of other and unspecified sites
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes1 — never code together

The conditions below can never be reported together with C79 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

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

What codes fall under C79? (10)

How long has C79 existed?

C79 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.