C24.1 Malignant neoplasm of ampulla of Vater

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

Applies from C24 Malignant neoplasm of other and unspecified parts of biliary tract

Excludes1 (never code together)

• malignant neoplasm of intrahepatic bile duct (C22.1)

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) 435-437 in MDC 07.

Approximate ICD-9-CM (GEMs)

• 156.2 Malignant neoplasm of ampulla of vater

Nearby codes

• C24 Malignant neoplasm of other and unspecified parts of biliary tract
• C24.0 Malignant neoplasm of extrahepatic bile duct
• C24.1 Malignant neoplasm of ampulla of Vater (this code)
• C24.8 Malignant neoplasm of overlapping sites of biliary tract
• C24.9 Malignant neoplasm of biliary tract, unspecified