ICD-10-CM 2027 diagnosis code
C7AMalignant neuroendocrine tumors
C7A is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.
Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data
About C7A
C7A is the ICD-10-CM diagnosis code for malignant neuroendocrine tumors. It belongs to block C7A (malignant 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: C7A.0 (tumors), C7A.1 (tumors) and C7A.8 (tumors).
The conditions in its Excludes2 note aren't part of C7A, but may be coded alongside it if the patient has both: malignant pancreatic islet cell tumors (C25.4) and Merkel cell carcinoma (C4A.-).
Use an additional code to identify any associated endocrine syndrome, such as: carcinoid syndrome (E34.00).
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 C7A
- C7A.0Malignant carcinoid tumors
- C7A.00Malignant carcinoid tumor of unspecified siteBillable
- C7A.01Malignant carcinoid tumors of the small intestine
- C7A.02Malignant carcinoid tumors of the appendix, large intestine, and rectum
- C7A.020Malignant carcinoid tumor of the appendixBillable
- C7A.021Malignant carcinoid tumor of the cecumBillable
- C7A.022Malignant carcinoid tumor of the ascending colonBillable
- C7A.023Malignant carcinoid tumor of the transverse colonBillable
- C7A.024Malignant carcinoid tumor of the descending colonBillable
- C7A.025Malignant carcinoid tumor of the sigmoid colonBillable
- C7A.026Malignant carcinoid tumor of the rectumBillable
- C7A.029Malignant carcinoid tumor of the large intestine, unspecified portionBillable
- C7A.09Malignant carcinoid tumors of other sites
- C7A.090Malignant carcinoid tumor of the bronchus and lungBillable
- C7A.091Malignant carcinoid tumor of the thymusBillable
- C7A.092Malignant carcinoid tumor of the stomachBillable
- C7A.093Malignant carcinoid tumor of the kidneyBillable
- C7A.094Malignant carcinoid tumor of the foregut, unspecifiedBillable
- C7A.095Malignant carcinoid tumor of the midgut, unspecifiedBillable
- C7A.096Malignant carcinoid tumor of the hindgut, unspecifiedBillable
- C7A.098Malignant carcinoid tumors of other sitesBillable
- C7A.1Malignant poorly differentiated neuroendocrine tumorsBillable
- C7A.8Other malignant neuroendocrine tumorsBillable
Coding notes
- code to identify any associated endocrine syndrome, such as:
- carcinoid syndrome (E34.00)
- any associated multiple endocrine neoplasia [MEN] syndromes (E31.2-)
Notes that apply from higher levels
Instructions written at a parent level also apply to C7A.
Broader instructions also apply from Chapter 2: Neoplasms.
Alphabetic index entries
1 entriesTerms in the official ICD-10-CM index that lead to C7A.
Codes whose notes reference C7A
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about C7A
Is C7A billable?
- No. C7A is a header code. Report one of its more specific subcodes instead.