The impact of improving access to primary care.

OBJECTIVES: To measure the size and timing of changes in utilization and costs for employees and dependents who had major access barriers to primary care removed, across an 8-year period (2007 to 2014).

STUDY DESIGN AND METHODS: Retrospective observational study examining patterns of utilization and costs before and after the implementation of a worksite medical office in 2010. The worksite office offered convenient primary care services with no travel from work, essentially guaranteed same day access, and no co-pay. Trends in visit rates and costs were compared for an intervention fixed cohort group (employees and dependents) at the employer (n = 1211) with a control fixed cohort group (n = 542 162) for 6 types of visits (primary, urgent, emergency, inpatient, specialty, and other outpatient). Difference-in-differences methods assessed the significance of between-group changes in utilization and costs.

RESULTS: The worksite medical office intervention group had an increase in primary care visits relative to the control group (+43% vs +4%, P < 0.001). This was accompanied by a reduction in urgent care visits by the intervention group compared with the control group (-43% vs -5%, P < 0.001). There were no differences in the other types of visits, and the total visit costs for the intervention group increased 5.7% versus 2.7% for the control group (P = 0.008). A sub-group analysis of the intervention group (comparing dependents to employees) found that that the dependents achieved a reduction in costs of 2.7% (P < 0.001) across the study period.

CONCLUSIONS: The potential for long-term reduction in utilization and costs with better access to primary care is significant, but not easily nor automatically achieved.