Regional enteritis of small intestine with large intestine

This code signifies Crohn's disease that affects both the small intestine and the large intestine. It represents chronic inflammatory bowel disease characterized by transmural inflammation, skip lesions, and potential complications such as strictures or fistulas.

Use this code when documentation explicitly states Crohn's disease involving both the small and large bowel. This diagnosis is typically supported by endoscopic findings, imaging studies (e.g., CT enterography, MRI), and biopsy results confirming regional enteritis extending to the colon.

• Differentiate from Crohn's disease limited to the small intestine (555.0) or large intestine (555.1).
• Always review the physician's documentation for the specific anatomical sites involved.
• Consider additional codes for complications such as intestinal obstruction, fistula, or abscess, if documented.