|Classification and external resources|
|ICD-10||K50.0 - K52.9|
Ileitis is an inflammation of the ileum, a portion of the small intestine. Crohn's ileitis is a type of Crohn's disease affecting the ileum. Ileitis is caused by the bacterium Lawsonia intracellularis. Inflammatory bowel disease does not associate with Lawsonia intracellularis infection.