C26.9 Malignant neoplasm of ill-defined sites within the digestive system

Billable ICD-10-CM code, FY2026.

Applicable to

• Malignant neoplasm of alimentary canal or tract NOS
• Malignant neoplasm of gastrointestinal tract NOS

Excludes1 (never code together)

• malignant neoplasm of abdominal NOS (C76.2)
• malignant neoplasm of intra-abdominal NOS (C76.2)

Applies from C26 Malignant neoplasm of other and ill-defined digestive organs

Excludes1 (never code together)

• malignant neoplasm of peritoneum and retroperitoneum (C48.-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 22 — Bladder, Colorectal, and Other Cancers
• CMS-HCC V22: HCC 11 — Colorectal, Bladder, and Other Cancers
• ESRD V24: HCC 11

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 159.8 Malignant neoplasm of other sites of digestive system and intra-abdominal organs (approximate)
• 159.9 Malignant neoplasm of ill-defined sites within the digestive organs and peritoneum (approximate)

Nearby codes

• C26 Malignant neoplasm of other and ill-defined digestive organs
• C26.0 Malignant neoplasm of intestinal tract, part unspecified
• C26.1 Malignant neoplasm of spleen
• C26.9 Malignant neoplasm of ill-defined sites within the digestive system (this code)