ICD-10-CM · Chapter 2

C79..9 Secondary malignant neoplasm of unspecified site

Billable

← C79 — Secondary malignant neoplasm of other and unspecified sites Chapter 2: C00-D49

Includes

Metastatic cancer NOS
Metastatic disease NOS

Excludes 1 (cannot be coded together)

carcinomatosis NOS (C80.0)
generalized cancer NOS (C80.0)
malignant (primary) neoplasm of unspecified site (C80.1)

Last reviewed: September 2026