Inpatient, Outpatient, and Pharmacy Costs in Patients With and Without HIV in the US Veteran's Affairs Administration System

Abstract

Objectives: To evaluate the association between human immunodeficiency virus (HIV) patients and medical costs (inpatient, outpatient, pharmacy, total) using a national cohort of HIV-infected Veterans and non-HIV matched controls within the Veteran's Affairs (VA) Administration system.

Design: This study used claims (January 2000 to December 2016) extracted from the VA Informatics and Computing Infrastructure and VA Health Economics Resource Center. Cases included Veterans with an International Classification of Diseases, Ninth Revision/International Classification of Diseases, Tenth Revision for HIV with at least 1 prescription for a complete antiretroviral therapy regimen (January 2000 to September 2016). Two non-HIV controls were exact matched on race, sex, month, and year of birth. All patients were followed until the earliest of the following: last date of VA activity, death, or December 31, 2016.

Results: A total of 79 578 patients (26 526 HIV and 53 052 non-HIV) met all study criteria. The average age was 49.3 years, 38% were black, 32% were white, and 97% were male for both the HIV and control cohorts. Adjusted multivariable logistic regression models demonstrated that HIV was associated with higher odds of incurring a pharmacy cost (odds ratio = 2286.45, 95% confidence interval: 322.79-16 195.82), 4-fold, and 2-fold higher odds of incurring both outpatient and inpatient costs compared to the matched controls, respectively. In adjusted multivariable gamma generalized linear models, HIV-positive patients had an almost 4-fold, 17-fold, and almost 2-fold higher cost than matched controls in total, pharmacy, and outpatient costs, respectively.

Conclusions: This study found an association between HIV-positive patients having higher odds of incurring a medical cost as well as higher medical costs compared to non-HIV controls.

Keywords: HIV; inpatient costs; outpatient costs; pharmacy costs.