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C79.9

✓ Billable

Secondary malignant neoplasm of unspecified site

Neoplasms (C00-D49)

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Also Known As

Metastatic cancer NOSMetastatic disease NOS

❌ Excludes1

direct

Cannot be coded with C79.9

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

❌ Excludes1

inherited from C79

Rules from parent category C79: Secondary malignant neoplasm of other and unspecified sites

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

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Code Information

CodeC79.9
BillableYes
ParentC79
CategoryNeoplasms (C00-D49)
Excludes15 rule(s)
Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)