Secondary neuroendocrine tumors (C7B) ICD-10-CM
The C7B code range covers secondary neuroendocrine tumors with 10 ICD-10-CM diagnosis codes. 8 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
- code to identify any functional activity
Codes in the C7B Range 10 codes · 8 billable
- C7B Secondary neuroendocrine tumorsNon-billable
- C7B.0 Secondary carcinoid tumorsNon-billable
- C7B.00 Secondary carcinoid tumors, unspecified site
- C7B.01 Secondary carcinoid tumors of distant lymph nodes
- C7B.02 Secondary carcinoid tumors of liver
- C7B.03 Secondary carcinoid tumors of bone
- C7B.04 Secondary carcinoid tumors of peritoneum
- C7B.09 Secondary carcinoid tumors of other sites
- C7B.1 Secondary Merkel cell carcinoma
- C7B.8 Other secondary neuroendocrine tumors
About the C7B Code Range
ICD-10 code range C7B is specifically used to classify secondary neuroendocrine tumors, which are cancerous growths that have spread from their original site to other parts of the body. These codes are crucial for identifying malignant tumors such as carcinoid tumors and Merkel cell carcinoma when they occur as metastases.
Within this range, the code C7B.0 covers secondary carcinoid tumors, including detailed locations such as distant lymph nodes (C7B.01), liver (C7B.02), bone (C7B.03), and peritoneum (C7B.04), with C7B.00 used when the site is unspecified. C7B.1 identifies secondary Merkel cell carcinoma, a rare and aggressive skin cancer that has metastasized. Additionally, C7B.8 encompasses other lesser-defined secondary neuroendocrine tumors and is associated with terms like secondary neuroendocrine carcinoma of peritoneum or carcinoma of peritoneum. Understanding these codes helps healthcare professionals accurately document and treat metastatic neuroendocrine malignancies based on their location and type.
Questions About This Page
How many billable codes are in the C7B range?
Of the 10 codes in this range, 8 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the C7B range classify?
The range classifies secondary neuroendocrine tumors. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
