Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80) ICD-10-CM
The C76–C80 section covers malignant neoplasms of ill-defined, other secondary and unspecified sites with 38 ICD-10-CM diagnosis codes, of which 31 are billable in fiscal year 2026. The section is organized into the 2 code ranges listed below.
Code Ranges in This Section 2 ranges · 38 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| C7A | Malignant neuroendocrine tumors (C7A) | 28 | 23 |
| C7B | Secondary neuroendocrine tumors (C7B) | 10 | 8 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the C76–C80 Code Range
ICD-10 codes C76 through C80 cover malignant neoplasms arising from ill-defined, secondary, or unspecified sites in the body. These codes are specifically used when the primary tumor location is ambiguous, when cancer has spread to secondary sites like lymph nodes or organs, or when the overall site is unspecified.
This range includes detailed codes for malignant neoplasms of ill-defined sites such as the head, neck, thorax, abdomen, pelvis, and limbs (C76). It also covers secondary malignant neoplasms, or metastases, of lymph nodes (C77), respiratory and digestive organs (C78), other and unspecified sites including organs like skin, brain, bone, ovary, adrenal gland, and breast (C79). The codes clarify distinctions between specific regions whenever the malignancy has metastasized, such as right versus left lung or kidney. Finally, C80 codes classify malignant neoplasms without specification of site or with widespread dissemination, including those associated with transplanted organs. Synonyms like "adenocarcinoma of neck" or "metastatic carcinoma to lymph nodes of head and neck" directly link common cancer terms to precise codes for accurate medical coding and documentation.
Questions About This Page
How many codes are in the C76-C80 range?
The C76-C80 range contains 38 ICD-10-CM diagnosis codes in FY 2026. 31 of them are billable, and the rest are category headers that organize the section.
What conditions does C76-C80 cover?
The range covers malignant neoplasms of ill-defined, other secondary and unspecified sites. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
