Access to Healthcare and the Utilization of Sexually Transmitted Infections Among Homeless Medicaid Patients 15 to 44 Years of Age.

Homelessness poses a direct threat to public health in the US as many individuals face debilitating health outcomes and barriers to adequate health care. Access to STI care for the homeless Medicaid population of USA has not been well-studied using administrative claims data. Our study aims to compare health services utilization, STI screening and diagnoses among people experiencing homelessness (PEH) vs. those who are non-PEH using ICD10 codes. We used 2019 MarketScan Medicaid claims data to analyze men and women aged 15-44 years with a diagnosis code for PEH (Z59.0), non-PEH (without Z59.0) and assessed their emergency department and outpatient visits and STI/HIV diagnoses and screening rates. We identified 5135 PEH men and 3571 PEH women among 1.3 million men and 2.1 million women in the 2019 US Medicaid database. PEH patients were more likely to have ED visits (94.80% vs 33.04%) and ≥ 20 outpatient clinic visits (60.29% vs 16.16%) than non-PEH patients in 2019. Higher diagnoses were observed for syphilis 1.57% (CI 1.32-1.86) vs 0.11% (CI 0.11-0.11), HIV 3.93% (CI 3.53-4.36) vs 0.41% (CI 0.41-0.42), chlamydia 1.94% (CI 1.66-2.25) vs 0.85% (CI 0.84-0.86) and gonorrhea 1.26% (CI 1.04-1.52) vs. 0.33% (CI 0.33-0.34) (p < 0.0001) among PEH compared to non-PEH. Among PEH, higher STI/HIV diagnoses rates indicate an increase in STI burden and suboptimal STI testing indicates an underutilization of STI services despite having a higher percentage of health care visits compared to non-PEH patients. Focused STI/HIV interventions are needed to address health care needs of PEH patients.