• Donald E Nichols, Susan G Haber, Melissa A Romaire, Suzanne G Wensky, and Multi-Payer Advanced Primary Care Practice Evaluation Team.
• American Institutes for Research, Rockville, MD.
• Med Care. 2018 Sep 1; 56 (9): 775-783.

BackgroundPatient-centered medical homes are expected to reduce expenditures by increasing the use of primary care services, shifting care from inpatient to outpatient settings, and reducing avoidable utilization. Under the Multi-Payer Advanced Primary Care Practice (MAPCP) Demonstration, Medicare joined Medicaid and commercial payers in 8 states to support ongoing patient-centered medical home initiatives.ObjectiveTo evaluate the effects of the MAPCP Demonstration on health care utilization and expenditures for Medicare beneficiaries.Research DesignWe used difference-in-differences regression modeling to estimate changes in utilization and expenditures before and after the start of the MAPCP Demonstration, comparing beneficiaries engaged with MAPCP Demonstration practices to beneficiaries engaged with primary care practices that were not medical homes. Qualitative data collected during annual site visits provided contextual information on participating practices to inform interpretations of the demonstration outcomes.SubjectsFee-for-service Medicare beneficiaries attributed to MAPCP Demonstration practices or to comparison group practices.MeasuresMedicare claims were used to measure total Medicare expenditures and utilization and expenditures for inpatient, emergency room, primary care, and specialist services.ResultsDespite the transformation of practices over the demonstration period, there was minimal evidence of a shift to more efficient utilization of health care services, and only 1 state saw a statistically significant reduction in total per-beneficiary expenditures.ConclusionsAlthough the MAPCP Demonstration did not have strong, consistent impacts on utilization and expenditures, this evaluation provides insights that may be useful for the design of future health care transformation models.

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