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Rheumatoid arthritis (RA) is a common chronic condition with substantial morbidity that can now be treated with disease-modifying biologic agents that target tumor necrosis factor (TNF) or related mechanisms. The anti-TNF biologic agents are available in either intravenous (IV) or subcutaneous dose forms. The biologic agents with an indication for rheumatoid arthritis and administered only by IV infusion in medical offices include abatacept, infliximab, and rituximab. Although the literature on RA treatments, their outcomes, and aspects of their costs is substantial, the costs of administration by the IV route have not been directly studied.To assess the detailed costs of administering IV biologic agents for the treatment of RA in relation to the total cost of the medication itself in the United States.The sample included all patients with at least 1 medical claim with an ICD-9-CM diagnosis code for RA (codes 714.XX) in any claim field and at least 1 claim for infliximab, abatacept, or rituximab (HCPCS codes J1745, J0129, and J9310, respectively) at any time from January 1, 2006, through December 31, 2008, in a database associated with billing and claims administration for 72 U.S. medical clinics. Costs were determined using the payer allowed payment, which is the total contractual amount that the provider should receive, including the patient cost share. Costs were measured as the average cost per IV administration visit and in relation to the dose of medication billed. The authors verified that an RA diagnosis was present on 100% of infusion claims for the study drugs.Over the study period for claims with dates of service from January 1, 2006, through December 31, 2008, 72 medical clinics had claims for a total of 4,248 unique patients with RA and a total of 33,354 clinic visits in which these patients received at least 1 infusion of 1 of 3 biologic agents (26,586 for infliximab, 4,807 for abatacept, and 1,961 for rituximab). Mean (SD) total payment for all drugs and other cost components was $2,874 ($1,515) per visit, of which IV administration costs were $226 (7.9%); the mean cost of the biologic agent itself was $2,616 (91.0%), and other visit-related services were $33 (1.1%). For individual agents, the total costs of visits were $2,828, $1,827, and $6,076; and the costs of IV administration were $224, $171, and $390, respectively, for infliximab, abatacept, and rituximab.For patients who received an IV biologic agent to treat RA, IV administration costs accounted for 7.9% of the total cost of the visit.