ICD-10-CM 2027 diagnosis code

C7A.01Malignant carcinoid tumors of the small intestine

Not billable — use a more specific code

C7A.01 is a header code, so it can't be reported by itself. Choose one of the 4 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 C7A.01

C7A.01 is the ICD-10-CM diagnosis code for malignant carcinoid tumors of the small intestine. It belongs to category C7A (malignant neuroendocrine tumors), 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 4 subcodes must be used instead.

Within C7A.0 (malignant carcinoid tumors), C7A.01 is specifically for malignant carcinoid tumors of the small intestine. Related codes cover tumor of unspecified site (C7A.00), of the appendix, large intestine, and rectum (C7A.02) and of other sites (C7A.09).

To report this condition, pick the subcode that matches the documentation: C7A.010 (duodenum), C7A.011 (jejunum), C7A.012 (ileum) and C7A.019 (portion).

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.01

Notes that apply from higher levels

Instructions written at a parent level also apply to C7A.01.

› From C7A Malignant neuroendocrine tumors

Excludes2

malignant pancreatic islet cell tumors (C25.4)
Merkel cell carcinoma (C4A.-)

Use additional code

code to identify any associated endocrine syndrome, such as:
carcinoid syndrome (E34.00)

Code also

any associated multiple endocrine neoplasia [MEN] syndromes (E31.2-)

Broader instructions also apply from Chapter 2: Neoplasms.

Codes whose notes reference C7A.01

C17Excludes1

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.01

Is C7A.01 billable?: No. C7A.01 is a header code. Report one of its more specific subcodes instead.