Skip to content
Dx

ICD-10-CM 2027 diagnosis code

C7BSecondary neuroendocrine tumors

Not billable — use a more specific code

C7B is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C7B

C7B is the ICD-10-CM diagnosis code for secondary neuroendocrine tumors. It belongs to block C7B (secondary neuroendocrine tumors) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: C7B.0 (tumors), C7B.1 (carcinoma) and C7B.8 (tumors).

Use an additional code to identify any functional activity.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under C7B

Coding notes

Use additional codeAdd a secondary code to fully describe the condition
  • code to identify any functional activity

Notes that apply from higher levels

Instructions written at a parent level also apply to C7B.

Broader instructions also apply from Chapter 2: Neoplasms.

Codes whose notes reference C7B

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about C7B

Is C7B billable?

No. C7B is a header code. Report one of its more specific subcodes instead.