Figure 1.

Rates for principal HIV hospitalizations (n = 10 980), secondary HIV hospitalizations (n = 59 987), and overall hospitalizations (n = 11.2 million), by year, Illinois, 2008-2014. Principal HIV hospitalizations are hospitalizations with a principal diagnostic code (ie, the first-listed diagnosis) with International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) HIV codes 042, 079.53, or 795.71 indicating that a patient was hospitalized because of a complication of HIV infection.¹¹ Secondary HIV hospitalizations are hospitalizations with an ICD-9-CM HIV code as any nonprincipal diagnostic code. Data sources: Illinois Department of Public Health, hospital discharge data¹⁰; Illinois HIV surveillance data¹³; and US Census population estimates, 2008-2014.¹⁴