ICD-10-CM Diagnosis Code (2025)
Official Description for C79.9
Secondary malignant neoplasm of unspecified site
Coding Notes & Guidelines for C79.9
Excludes1: Not Coded Here
- carcinomatosis NOS (C80.0)
- generalized cancer NOS (C80.0)
- malignant (primary) neoplasm of unspecified site (C80.1)
Inclusion Terms
- Metastatic cancer NOS
- Metastatic disease NOS
Parent Code (Less Specific):
About ICD-10-CM Code C79.9 (Secondary malignant neoplasm of unspecified site)
ICD-10-CM code C79.9 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM C79.9 became effective on October 1, 2024.
This page provides detailed information about C79.9 - Secondary malignant neoplasm of unspecified site. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Secondary malignant neoplasm of unspecified site.