ICD-10-CM C79: Secondary malignant neoplasm of other and unspecified sites

ICD-10-CM Diagnosis Code (2025)

Official Description for C79

Secondary malignant neoplasm of other and unspecified sites

Coding Notes & Guidelines for C79

Excludes1: Not Coded Here
  • secondary carcinoid tumors (C7B.-)
  • secondary neuroendocrine tumors (C7B.-)
Excludes1: Not Coded Here

secondary Merkel cell carcinoma (C7B.1)

Excludes1: Not Coded Here

secondary carcinoid tumors of bone (C7B.03)

Excludes1: Not Coded Here
  • carcinomatosis NOS (C80.0)
  • generalized cancer NOS (C80.0)
  • malignant (primary) neoplasm of unspecified site (C80.1)
Excludes2: Not Included Here

lymph node metastases (C77.0)

Inclusion Terms
  • Metastatic cancer NOS
  • Metastatic disease NOS

Child Codes (More Specific Codes for C79):

C79.0 - Secondary malignant neoplasm of kidney and renal pelvis C79.00 - Secondary malignant neoplasm of unspecified kidney and renal pelvis C79.01 - Secondary malignant neoplasm of right kidney and renal pelvis C79.02 - Secondary malignant neoplasm of left kidney and renal pelvis C79.1 - Secondary malignant neoplasm of bladder and other and unspecified urinary organs C79.10 - Secondary malignant neoplasm of unspecified urinary organs C79.11 - Secondary malignant neoplasm of bladder C79.19 - Secondary malignant neoplasm of other urinary organs C79.2 - Secondary malignant neoplasm of skin C79.3 - Secondary malignant neoplasm of brain and cerebral meninges C79.31 - Secondary malignant neoplasm of brain C79.32 - Secondary malignant neoplasm of cerebral meninges C79.4 - Secondary malignant neoplasm of other and unspecified parts of nervous system C79.40 - Secondary malignant neoplasm of unspecified part of nervous system C79.49 - Secondary malignant neoplasm of other parts of nervous system C79.5 - Secondary malignant neoplasm of bone and bone marrow C79.51 - Secondary malignant neoplasm of bone C79.52 - Secondary malignant neoplasm of bone marrow C79.6 - Secondary malignant neoplasm of ovary C79.60 - Secondary malignant neoplasm of unspecified ovary C79.61 - Secondary malignant neoplasm of right ovary C79.62 - Secondary malignant neoplasm of left ovary C79.63 - Secondary malignant neoplasm of bilateral ovaries C79.7 - Secondary malignant neoplasm of adrenal gland C79.70 - Secondary malignant neoplasm of unspecified adrenal gland C79.71 - Secondary malignant neoplasm of right adrenal gland C79.72 - Secondary malignant neoplasm of left adrenal gland C79.8 - Secondary malignant neoplasm of other specified sites C79.81 - Secondary malignant neoplasm of breast C79.82 - Secondary malignant neoplasm of genital organs C79.89 - Secondary malignant neoplasm of other specified sites C79.9 - Secondary malignant neoplasm of unspecified site

About ICD-10-CM Code C79 (Secondary malignant neoplasm of other and unspecified sites)

ICD-10-CM code C79 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 became effective on October 1, 2024.

This page provides detailed information about C79 - Secondary malignant neoplasm of other and unspecified sites. 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 other and unspecified sites.