• Danny McCormick, Amresh D Hanchate, Karen E Lasser, Meredith G Manze, Mengyun Lin, Chieh Chu, and Nancy R Kressin.
• Harvard Medical School, Department of Medicine, Cambridge Health Alliance, 1493 Cambridge, MA 02139, USA danny_mccormick@hms.harvard.edu.
• BMJ. 2015 Jan 1;350:h1480.

ObjectivesTo examine the impact of Massachusetts healthcare reform on changes in rates of admission to hospital for ambulatory care sensitive conditions (ACSCs), which are potentially preventable with good access to outpatient medical care, and racial and ethnic disparities in such rates, using complete inpatient discharge data (hospital episode statistics) from Massachusetts and three control states.DesignDifference in differences analysis to identify the change, overall and according to race/ethnicity, adjusted for secular changes unrelated to reform.SettingHospitals in Massachusetts, New York, New Jersey, and Pennsylvania, United States.ParticipantsAdults aged 18-64 (those most likely to have been affected by the reform) admitted for any of 12 ACSCs in the 21 months before and after the period during which reform was implemented (July 2006 to December 2007).Main Outcome MeasuresAdmission rates for a composite of all 12 ACSCs, and subgroup composites of acute and chronic ACSCs.ResultsAfter adjustment for potential confounders, including age, race and ethnicity, sex, and county income, unemployment rate and physician supply, we found no evidence of a change in the admission rate for overall composite ACSC (1.2%, 95% confidence interval -1.6% to 4.1%) or for subgroup composites of acute and chronic ACSCs. Nor did we find a change in disparities in admission rates between black and white people (-1.9%, -8.5% to 5.1%) or white and Hispanic people (2.0%, -7.5% to 12.4%) for overall composite ACSC that existed in Massachusetts before reform. In analyses limited to Massachusetts only, we found no evidence of a change in admission rate for overall composite ACSC between counties with higher and lower rates of uninsurance at baseline (1.4%, -2.3% to 5.3%).ConclusionsMassachusetts reform was not associated with significantly lower overall or racial and ethnic disparities in rates of admission to hospital for ACSCs. In the US, and Massachusetts in particular, additional efforts might be needed to improve access to outpatient care and reduce preventable admissions.© McCormick et al 2015.

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