2026 ICD-10-CM Diagnosis Code C7A.029Malignant carcinoid tumor of the large intestine, unspecified portion
ICD-10-CM Codes›C00–D49›C7A›C7A
- Billable — Valid for Submission
- Chronic Condition
C7A.029 is a billable ICD-10-CM diagnosis code for malignant carcinoid tumor of the large intestine, unspecified portion. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 374 through 376. Coders also document this condition as enterochromaffin cell tumor of colon. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Malignant neuroendocrine tumors.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Enterochromaffin cell tumor of colon
- Malignant carcinoid tumor of large intestine
- Primary malignant neuroendocrine neoplasm of colon
- Primary malignant neuroendocrine neoplasm of large intestine
- Primary well-differentiated neuroendocrine tumor of colon
- Well-differentiated neuroendocrine tumor of colon
- Well-differentiated neuroendocrine tumor of large intestine
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Malignant carcinoid tumor of the colon NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Tumor
- carcinoid
- malignant
- colon
- Tumor
- carcinoid
- malignant
- large intestine
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Carcinoid Tumors
Carcinoid tumors are rare, slow-growing cancers. They usually start in the lining of the digestive tract or in the lungs. They grow slowly and don't produce symptoms in the early stages. As a result, the average age of people diagnosed with digestive or lung carcinoids is about 60.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert C7A.029 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About C7A.029Overview
Is C7A.029 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report malignant carcinoid tumor of the large intestine, unspecified portion on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does C7A.029 group to?
When malignant carcinoid tumor of the large intestine, unspecified portion is the principal diagnosis on an inpatient stay, it groups to MS-DRG 374, 375, 376, with relative weights from 0.9243 to 2.1387 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of C7A.029?
Under the General Equivalence Mappings, malignant carcinoid tumor of the large intestine, unspecified portion converts to ICD-9-CM 209.10 (mal crcnoid lg intst NOS). The mapping is a direct match.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
