Health & Housing in Delaware:: Matching Medicaid Claims and Encounters and the Community Management Information System Databases.

This study draws upon data from two databases: claims and encounters that were reimbursed by the state's Division of Medicaid and Medical Assistance (DMMA) and the Homeless Management Information System (HMIS) database that collects homeless services data on individuals experiencing homelessness. Records from both sets are matched to identify 838 adults who both experienced homelessness and were Medicaid eligible in 2019, and to select, through propensity score matching, an equal set of control observations who were similarly Medicaid-eligible but had no record of homelessness. Outcomes are compared based upon scores on the Charlson Elixhauser Comorbidity index, incidence of substance use disorder, inpatient, emergency department, and outpatient visits, and inpatient, emergency department, and outpatient costs. Using ordinary least squares regression models, we estimate homelessness (as indicated by use of homeless services) to be associated with excess costs of $4,611 (non-chronic homelessness) to $5,218 (chronic homelessness) per person over the course of 2019, compared to similar Medicaid enrollees who were housed.