The TREAT Registry is a prospective, observational, multicenter, long-term registry featuring clinical, economic, and humanistic measures characterizing the treatment of Crohn's disease. The registry's target minimum enrollment is for 5000 patients. It's objective is to track treatments and patient outcomes over at least a 5-year period. Physicians are expected to manage patients as they would under normal practice conditions. No predefined schedule of visits or medical procedures are required. Data are collected on a semi-annual basis by physicians documenting assessment of disease severity, medication use, and adverse events. Upon enrollment, patients complete a health assessment questionnaire.

As this is an observational study, no study drugs are administered.