2026 ICD-10-CM Diagnosis Code C7B.04Secondary carcinoid tumors of peritoneum

ICD-10-CM Codes›C00–D49›C7B›C7B

ICD-10-CM C7B.04
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C7B.04 is a billable ICD-10-CM diagnosis code for secondary carcinoid tumors of peritoneum. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Malignant neuroendocrine tumors.

Code Identity

ICD-10-CM Code
C7B.04
Billable Status
Yes — Valid for Submission
Code Describes
Secondary carcinoid tumors of peritoneum
Short Description
Secondary carcinoid tumors of peritoneum
Same as the full description in the CMS dataset.
Parent Code
C7B.0
Secondary carcinoid tumors

Code Classification

ChapterC00–D49Neoplasms
SectionC7BSecondary neuroendocrine tumors
CategoryC7BSecondary neuroendocrine tumors
This CodeC7B.04Secondary carcinoid tumors of peritoneum

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Mesentery metastasis of carcinoid tumor

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
        • mesentery metastasis
    • Tumor
      • carcinoid
        • secondary
          • peritoneum
    • Tumor
      • secondary
        • carcinoid
          • peritoneum

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 C7B.04 to ICD-9-CMHistory

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

ICD-9-CM
209.74 Sec neuroendo tu-periton
Approximate The match is approximate rather than exact.

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 C7B.04Overview

Is C7B.04 (Secondary carcinoid tumors) a billable code?

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

What MS-DRG does C7B.04 group to?

When secondary carcinoid tumors of peritoneum 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 C7B.04?

Under the General Equivalence Mappings, secondary carcinoid tumors of peritoneum converts to ICD-9-CM 209.74 (sec neuroendo tu-periton). The mapping is approximate, so confirm the match fits the documentation.

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.