C79.9

Billable

Secondary malignant neoplasm of unspecified site

C79.9 is the ICD-10-CM code for Secondary malignant neoplasm of unspecified site. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
C00-D49
Parent
C79
Edition
FY2026

C00-D49 Neoplasms

Includes

  • Metastatic cancer NOS
  • Metastatic disease NOS

Excludes1 — not coded here

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

Frequently asked questions

What is ICD-10 code C79.9?
C79.9 is the ICD-10-CM code for "Secondary malignant neoplasm of unspecified site". It falls under C00-D49 Neoplasms.
Is C79.9 a billable code?
Yes — C79.9 is a billable, specific ICD-10-CM code valid for reimbursement.
What is excluded from C79.9?
Excludes1 (not coded here): carcinomatosis NOS (C80.0); generalized cancer NOS (C80.0); malignant (primary) neoplasm of unspecified site (C80.1).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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