2026 ICD-10-CM Diagnosis Code C7A.021Malignant carcinoid tumor of the cecum

ICD-10-CM Codes›C00–D49›C7A›C7A

ICD-10-CM C7A.021
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C7A.021 is a billable ICD-10-CM diagnosis code for malignant carcinoid tumor of the cecum. 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 malignant carcinoid tumor of cecum. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Malignant neuroendocrine tumors.

Code Identity

ICD-10-CM Code
C7A.021
Billable Status
Yes — Valid for Submission
Code Describes
Malignant carcinoid tumor of the cecum
Short Description
Malignant carcinoid tumor of the cecum
Same as the full description in the CMS dataset.
Parent Code
C7A.02
Malignant carcinoid tumors of the appendix, large intestine, and rectum

Code Classification

ChapterC00–D49Neoplasms
SectionC7AMalignant neuroendocrine tumors
CategoryC7AMalignant neuroendocrine tumors
This CodeC7A.021Malignant carcinoid tumor of the cecum

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Malignant carcinoid tumor of cecum
  • Malignant carcinoid tumor of large intestine
  • Malignant neoplasm of cecum
  • Well-differentiated neuroendocrine tumor of cecum

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Tumor
      • carcinoid
        • malignant
          • cecum

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO066
Malignant neuroendocrine tumors
Default principal diagnosis: inpatient Yes · outpatient Yes

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.021 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
209.12 Malig carcinoid cecum
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C7A.021Overview

Is C7A.021 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report malignant carcinoid tumor of the cecum on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C7A.021 group to?

When malignant carcinoid tumor of the cecum 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.021?

Under the General Equivalence Mappings, malignant carcinoid tumor of the cecum converts to ICD-9-CM 209.12 (malig carcinoid cecum). 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.