C17.9 Malignant neoplasm of small intestine, unspecified

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

Applies from C17 Malignant neoplasm of small intestine

Excludes1 (never code together)

• malignant carcinoid tumors of the small intestine (C7A.01)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 20 — Lung and Other Severe Cancers
• CMS-HCC V22: HCC 9 — Lung and Other Severe Cancers
• RxHCC V08: HCC 22 — Prostate, Breast, Bladder, and Other Cancers and Tumors
• ESRD V24: HCC 9

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 152.9 Malignant neoplasm of small intestine, unspecified site

Nearby codes

• C17.0 Malignant neoplasm of duodenum
• C17.1 Malignant neoplasm of jejunum
• C17.2 Malignant neoplasm of ileum
• C17.3 Meckel's diverticulum, malignant
• C17.8 Malignant neoplasm of overlapping sites of small intestine
• C17.9 Malignant neoplasm of small intestine, unspecified (this code)