A Study of the Efficacy and Safety of Upadacitinib (ABT-494) in Participants With Moderately to Severely Active Crohn's Disease Who Have Inadequately Responded to or Are Intolerant to Biologic Therapy

Open to people ages 18-75

• Confirmed diagnosis of CD for at least 3 months prior to Baseline.
• Confirmed diagnosis of moderate to severe CD as assessed by stool frequency (SF), abdominal pain (AP) score.
• Evidence of mucosal inflammation based on the Simplified Endoscopic Score for Crohn's disease (SES-CD) on an endoscopy confirmed by a central reader.
• Demonstrated an inadequate response or intolerance to any biologic therapy for infliximab, adalimumab, certolizumab pegol, vedolizumab, and ustekinumab.
• If female, subject must meet the contraception recommendations

• Participant with a current diagnosis of ulcerative colitis or indeterminate colitis.
• Participant not on stable doses of CD related antibiotics, oral aminosalicylates, corticosteroids or methotrexate (MTX).
• Participant with the following known complications of CD: abscess (abdominal or peri-anal), symptomatic bowel strictures, fulminant colitis, toxic megacolon, or any other manifestation that might require surgery while enrolled in the study.
• Participant with ostomy or ileoanal pouch
• Participant diagnosed with short gut or short bowel syndrome
• Screening laboratory and other analyses show abnormal results.