Secondary malignant neoplasm of other and unspecified sites (C79) ICD-10-CM
The C79 code range covers secondary malignant neoplasm of other and unspecified sites with 34 ICD-10-CM diagnosis codes. 25 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the C79 Range 34 codes · 25 billable
- C79 Secondary malignant neoplasm of other and unspecified sitesNon-billable
- C79.0 Secondary malignant neoplasm of kidney and renal pelvisNon-billable
- 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 organsNon-billable
- 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 meningesNon-billable
- 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 systemNon-billable
- 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
- C79.51 Secondary malignant neoplasm of bone
- C79.52 Secondary malignant neoplasm of bone marrow
- C79.6 Secondary malignant neoplasm of ovaryNon-billable
- 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 glandNon-billable
- 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 sitesNon-billable
- C79.81 Secondary malignant neoplasm of breast
- C79.82 Secondary malignant neoplasm of genital organs
- C79.83 Secondary malignant neoplasm of oral cavity New
- C79.89 Secondary malignant neoplasm of other specified sites
- C79.9 Secondary malignant neoplasm of unspecified site
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the C79 range.
Metastatic Malignant Neoplasm in the Adrenal Gland
A malignant tumor that has spread to the adrenal gland from an adjacent or distant anatomic site. The majority of cases are metastatic carcinomas, and less frequently lymphomas.
Metastatic Malignant Neoplasm in the Bladder
The spread of a malignant neoplasm to the urinary bladder wall from an adjacent or distant anatomic site.
Metastatic Malignant Neoplasm in the Bone Marrow
The spread of a malignant neoplasm from its original site of growth to the bone marrow.
Metastatic Malignant Neoplasm in the Breast
The spread of a malignant neoplasm to the breast. This may be from a primary breast malignant neoplasm on the opposite side, or from a malignant neoplasm at a distant site.
Metastatic Malignant Neoplasm in the Kidney
The spread of a malignant neoplasm to the kidney. This may be from a primary kidney malignant neoplasm involving the opposite kidney, or from a malignant neoplasm at a distant site.
Metastatic Malignant Neoplasm in the Nervous System
The spread of a malignant neoplasm to the nervous system. This may be from a primary nervous system malignant neoplasm, or from a malignant neoplasm at a distant site.
Metastatic Malignant Neoplasm in the Ovary
The spread of a malignant neoplasm to the ovary. This may be from a primary ovarian malignant neoplasm involving the opposite ovary, or from a malignant neoplasm at a distant site.
Metastatic Malignant Neoplasm in the Reproductive System
The spread of a malignant neoplasm to the male or female reproductive system from an adjacent or distant anatomic site.
Metastatic Malignant Neoplasm in the Skin|Metastatic Malignant Neoplasm to the Skin
The spread of a malignant neoplasm to the skin. This may be from a primary skin malignant neoplasm, or from a malignant neoplasm at a distant site.
Metastatic Malignant Neoplasm in the Urinary System
The spread of a malignant neoplasm to the urinary system from an adjacent or distant anatomic site.
Metastatic Malignant Neoplasm to the Bone
A malignant neoplasm that has spread to the bone from another anatomic site.
Metastatic Malignant Neoplasm to the Brain
A malignant neoplasm that has spread to the brain from another anatomic site or system. The majority are carcinomas (usually lung or breast carcinomas).
Secondary Malignant Neoplasm
A malignant neoplasm that arises from a pre-existing lower grade lesion, or as a result of a primary lesion that has spread to secondary sites, or due to a complication of a cancer treatment.
About the C79 Code Range
These are cancers that have spread to another organ or tissue, rather than starting there. The codes identify where the secondary cancer is found.
C79.0 separates kidney and renal pelvis sites by right, left or unspecified side. C79.1 distinguishes the bladder from other or unspecified urinary organs. C79.3 separates the brain from its surrounding membranes, while C79.4 identifies other or unspecified nervous system parts. C79.5 separates bone from bone marrow. Ovary and adrenal gland subdivisions distinguish sides; ovary codes also include both ovaries. Skin has its own code. Other specified sites include breast, genital organs and oral cavity; an unspecified site has a separate code.
FY 2027 changes: The FY 2027 ICD-10-CM update, effective October 1, 2026, added C79.83.
Questions About This Page
How many billable codes are in the C79 range?
Of the 34 codes in this range, 25 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the C79 range classify?
The range classifies secondary malignant neoplasm of other and unspecified sites. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
