The Primary objective of this study is to understand the rheumatoid arthritis (RA) population in national integrated delivery network who are treated with first- or second-line biologic disease modifying anti-rheumatic drug (bDMARD) therapy (with or without Methotrexate) and to evaluate switching patterns and reasons for switching to another bDMARD.

For more information regarding BMS clinical trial participation, please visit www.BMSStudyConnect.com

Inclusion Criteria:

• Diagnosis of RA (ICD-9 714.xx) anytime during the study time period of 1/1/2007 to 10/31/2012
• Patients ≥18 years of age at diagnosis date
• Required to have to have 6 months pre-index and 12 months post-index continuous membership and drug benefit eligibility in the database

Exclusion Criteria:

• Patients less than 18 years of age on diagnosis date
• If they had a diagnosis of Crohn's disease, psoriasis, psoriatic arthritis, ulcerative colitis, ankylosing spondylitis, regional enteritis, or anal fistula during the pre-index period
• Patients who had <7 days supply of adalimumab or etanercept
• Patients currently in a clinical trial during our study
• If patients are in the second-line cohort and have more than 1 prior bDMARD

Individual patients with RA will be identified using electronic medical records from 01/01/2007 to 10/31/2012. The medical file contains data on diagnostic and therapeutic services rendered in both inpatient and outpatient settings. The diagnoses and procedures for these services are coded using ICD-9-CM, Current Procedural Terminology (CPT), and Diagnosis-Related Group (DRG) codes with service dates.