With the existing biologic anti-inflammatory product patents expiring and the FDA approval of new biosimilar and innovator biologics, patients with rheumatologic (RA), psoriatic (PsO-PsA-AS), and gastrointestinal (GI) conditions will have additional therapeutic options. This observational study will describe the patient characteristics of new users of Tumor Necrosis Factor-α (TNF) antagonists, non-TNF- α antagonists, oral DMARD, and non-biologic agents. It will describe in the treatment cohorts outcomes of serious infections that require hospitalization. The BBCIC will use the findings from this descriptive analysis to design a comparative study evaluating the real-world effectiveness and safety of biosimilar and innovator anti-inflammatory biologics.