2027 ICD-10-CM Diagnosis Code C7BSecondary neuroendocrine tumors

ICD-10-CM Codes›C00–D49›C7B›C7B

ICD-10-CM C7B
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to C7B: its own notes plus those printed at Chapter 2. A note printed at a category, block or chapter applies to every code under it.

Use Additional Code

Add a second code, after this one, to fully describe the condition.

  • code to identify any functional activity

Notes

General instructions on how these codes are used.

From Chapter 2 (C00-D49) Neoplasms applies to 1,730 codes
  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name C7B, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming C7B: they are not reported together with it, unless the two conditions are unrelated.

  • C79 Secondary malignant neoplasm of other and unspecified sites
    secondary carcinoid tumors (C7B.-)
  • C79 Secondary malignant neoplasm of other and unspecified sites
    secondary neuroendocrine tumors (C7B.-)

Code Also 1

These codes say C7B may also be needed to fully describe the condition. The note gives no sequencing direction.

  • E34.0 Carcinoid syndrome
    secondary neuroendocrine tumors (C7B.-)

Clinical InformationClinical

  • Metastatic Neuroendocrine Tumor

    a neuroendocrine tumor that has spread from its original site of growth to another anatomic site.

Patient EducationClinical

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Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About C7BOverview

What is the ICD-10 code for secondary neuroendocrine tumors?

C7B is the ICD-10-CM category for secondary neuroendocrine tumors, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Does C7B need an additional code?

When the condition applies, yes. The Use Additional Code note reads: code to identify any functional activity. The additional code is reported after C7B.