Emergency department use associated with primary care office management.

Objectives: The goal of this pilot study is to demonstrate whether revisiting and focusing on simple and generally known primary care office management practices has a meaningful impact on emergency department (ED) utilization for conditions that likely could have been treated in the primary care office setting (primary care physician [PCP] treatable).

Study Design: Cohort study using health plan administrative data from 2007 to 2010 involving primary care physicians (PCPs) affiliated with both Blue Care Network of Michigan, a nonprofit health maintenance organization, and Oakland Southfield Physicians PC, a Metropolitan Detroit independent practice association. PCPs were assigned to cohorts according to pre-intervention increasing or decreasing temporal trends in annual ED visit rates for PCP-treatable conditions by 12-month continuously enrolled commercial members with the same emergency care copay.

Methods: A difference-in-difference approach measuring control and intervention PCPs for the same 4 months (September-December) during 3 years (2007-2009) pre-intervention, and the available same 4-month period post-intervention, to determine if the pilot was associated with decreased ED utilization for PCP-treatable conditions.

Results: A substantive reversal of a worsening 2007 to 2009 trend (peak of 49.2 visits per 1000 in 2009 decreased to 7.3 visits/1000 in 2010) in ED use for PCP-treatable conditions at intervention sites, with the 2010 rate also lower than control sites (23.8 visits per 1000) during the same postintervention period.

Conclusions: Simple and effective practice management techniques, while generally known, require revisiting and focused attention by PCPs to limit rates of PCP-treatable ED visits.