2026 Secondary Malignant Neoplasms ICD-10-CM Codes ICD-10-CM
The FY 2026 dataset contains 38 secondary malignant neoplasms codes across 3 code blocks. Secondary malignant neoplasm codes document cancers that have metastasized from the primary site, the Malignant Secondary column of the Table of Neoplasms. Each code below lists the anatomical sites that map to it.
Coding Guidance
Identify and code both the primary malignancy and every documented metastatic site. Sequencing depends on which site the encounter addresses.
All Secondary Malignant Neoplasms Codes 38 codes · searchable by anatomical site
Secondary and unspecified malignant neoplasm of lymph nodes C77 · 8 codes
- C77.0 Secondary and unspecified malignant neoplasm of lymph nodes of head, face and neck
- C77.1 Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes
- C77.2 Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes
- C77.3 Secondary and unspecified malignant neoplasm of axilla and upper limb lymph nodes
- C77.4 Secondary and unspecified malignant neoplasm of inguinal and lower limb lymph nodes
- C77.5 Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes
- C77.8 Secondary and unspecified malignant neoplasm of lymph nodes of multiple regions
- C77.9 Secondary and unspecified malignant neoplasm of lymph node, unspecified
Secondary malignant neoplasm of respiratory and digestive organs C78 · 11 codes
- C78.0 Secondary malignant neoplasm of lungNon-billable header
- C78.1 Secondary malignant neoplasm of mediastinum
- C78.2 Secondary malignant neoplasm of pleura
- C78.30 Secondary malignant neoplasm of unspecified respiratory organ
- C78.39 Secondary malignant neoplasm of other respiratory organs
- C78.4 Secondary malignant neoplasm of small intestine
- C78.5 Secondary malignant neoplasm of large intestine and rectum
- C78.6 Secondary malignant neoplasm of retroperitoneum and peritoneum
- C78.7 Secondary malignant neoplasm of liver and intrahepatic bile duct
- C78.80 Secondary malignant neoplasm of unspecified digestive organ
- C78.89 Secondary malignant neoplasm of other digestive organs
Secondary malignant neoplasm of other and unspecified sites C79 · 19 codes
- C79.0 Secondary malignant neoplasm of kidney and renal pelvisNon-billable header
- 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
- C79.31 Secondary malignant neoplasm of brain
- C79.32 Secondary malignant neoplasm of cerebral meninges
- 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 marrowNon-billable header
- C79.51 Secondary malignant neoplasm of bone
- C79.52 Secondary malignant neoplasm of bone marrow
- C79.6 Secondary malignant neoplasm of ovaryNon-billable header
- C79.7 Secondary malignant neoplasm of adrenal glandNon-billable header
- C79.8 Secondary malignant neoplasm of other specified sitesNon-billable header
- 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
The info icon lists every anatomical site from the table that maps to the code. The filter above searches those anatomical sites too.
Questions About This Page
How do I find the right code for a specific site?
Type the anatomical site into the filter above. Every code on this page carries the site entries that map to it in the Table of Neoplasms. For all six behavior columns side by side, use the Table of Neoplasms.
How is neoplasm behavior determined?
The pathology or clinical documentation names the behavior. When the description of the neoplasm states the behavior, that description overrides the Index guidance, and the matching column of the Table of Neoplasms supplies the code.
How many secondary malignant neoplasms codes are there?
The FY 2026 dataset contains 38 secondary malignant neoplasms codes across 3 code blocks, 32 of them billable.
Related References
Source: official CMS FY 2026 ICD-10-CM release, effective October 1, 2025 through September 30, 2026.
