2026 ICD-10-CM Diagnosis Code C7BSecondary neuroendocrine tumors

ICD-10-CM Codes›C00–D49›C7B›C7B

ICD-10-CM C7B
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C7B is a non-billable ICD-10-CM category code for secondary neuroendocrine tumors, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C7B.00, C7B.01, C7B.02, and C7B.03.

Code Identity

ICD-10-CM Code
C7B
Billable Status
No — Non-Billable Category
Code Describes
Secondary neuroendocrine tumors
Short Description
Secondary neuroendocrine tumors
Same as the full description in the CMS dataset.
Chapter
C7B
Secondary neuroendocrine tumors

Code Classification

ChapterC00–D49Neoplasms
SectionC7BSecondary neuroendocrine tumors
CategoryC7BSecondary neuroendocrine tumors
This CodeC7BSecondary neuroendocrine tumors

Specific Coding for Secondary neuroendocrine tumorsOverview

Non-specific codes like C7B require more characters. Use one of these billable codes instead:

  • C7B.0 for Secondary carcinoid tumors

  • Use C7B.00 for Secondary carcinoid tumors, unspecified site

  • Use C7B.01 for Secondary carcinoid tumors of distant lymph nodes

  • Use C7B.02 for Secondary carcinoid tumors of liver

  • Use C7B.03 for Secondary carcinoid tumors of bone

  • Use C7B.04 for Secondary carcinoid tumors of peritoneum

  • Use C7B.09 for Secondary carcinoid tumors of other sites

  • Use C7B.1 for Secondary Merkel cell carcinoma

  • Use C7B.8 for Other secondary neuroendocrine tumors

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Use Additional Code

  • code to identify any functional activity

Patient EducationClinical

Cancer

Cancer is not just one disease but many diseases. Cancer begins in your cells, which are the building blocks of your body. Usually, your body forms new cells as needed, replacing old cells that die. Sometimes this process goes wrong. New cells grow even when you don't need them, and old cells don't die when they should.

The full article covers:

  • What is cancer?
  • What are the types of cancer?
  • How does cancer develop?
  • What are the symptoms of cancer?
  • How is cancer diagnosed?
  • What are the treatments for cancer?
  • Can cancer be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C7BOverview

Is C7B (Secondary neuroendocrine tumors) a billable code?

No. This is a category header that groups the codes for secondary neuroendocrine tumors, and headers cannot be submitted on claims. Claims for secondary neuroendocrine tumors need a more specific code from this category, such as C7B.00, C7B.01, and C7B.02.