C7B.04 Secondary carcinoid tumors of peritoneum

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Mesentery metastasis of carcinoid tumor

Applies from C7B Secondary neuroendocrine tumors

Use additional code

• code to identify any functional activity

Risk adjustment (HCC)

• CMS-HCC V28: HCC 17 — Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic
• CMS-HCC V22: HCC 8 — Metastatic Cancer and Acute Leukemia
• RxHCC V08: HCC 20 — Lung, Kidney, and Other Cancers; Secondary Cancer of Lymph Nodes and Other Sites
• ESRD V24: HCC 8

MS-DRG index

Defines the logic of DRG(s) 374-376 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 209.74 Secondary neuroendocrine tumor of peritoneum (approximate)

Code annotations containing back-references to C7B.04

Back-references to C7B.04

• Type 1 Excludes: C77 Secondary and unspecified malignant neoplasm of lymph nodes ("mesentery metastasis of carcinoid tumor (C7B.04)")
• Type 1 Excludes: C78 Secondary malignant neoplasm of respiratory and digestive organs ("secondary carcinoid tumors of peritoneum (C7B.04)")

Back-references to C7B

• Type 1 Excludes: C79 Secondary malignant neoplasm of other and unspecified sites ("secondary carcinoid tumors (C7B.-)")
• Type 1 Excludes: C79 Secondary malignant neoplasm of other and unspecified sites ("secondary neuroendocrine tumors (C7B.-)")
• Code Also: E34.0 Carcinoid syndrome ("secondary neuroendocrine tumors (C7B.-)")

Diagnosis Index entries for C7B.04

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

Nearby codes

• C7B.0 Secondary carcinoid tumors
• C7B.00 Secondary carcinoid tumors, unspecified site
• C7B.01 Secondary carcinoid tumors of distant lymph nodes
• C7B.02 Secondary carcinoid tumors of liver
• C7B.03 Secondary carcinoid tumors of bone
• C7B.04 Secondary carcinoid tumors of peritoneum (this code)
• C7B.09 Secondary carcinoid tumors of other sites
• C7B.1 Secondary Merkel cell carcinoma
• C7B.8 Other secondary neuroendocrine tumors