Potential effects of racial and ethnic disparities in meeting Medicare medication therapy management eligibility criteria.

OBJECTIVE Medication therapy management (MTM) has the potential to play an instrumental role in reducing racial and ethnic disparities in health care. However, previous research has found that Blacks and Hispanics are less likely to be eligible for MTM. The purpose of the current study was to examine the potential effects of MTM eligibility criteria on racial and ethnic disparities in health outcomes. METHODS The current study is a retrospective cross-sectional analysis of the Medicare Current Beneficiary Survey Cost and Use files for the years 2007 and 2008. A difference-in-differences model was used to compare disparities in outcomes between ineligible and eligible beneficiaries according to MTM eligibility criteria in 2010. This was achieved by including in regression models interaction terms between dummy variables for Blacks/Hispanics and MTM eligibility criteria. Interaction terms were interpreted on both multiplicative and additive terms. Various regression models were used depending on the types of variables. KEY FINDINGS Whites were more likely to report self-perceived good health status than Blacks and Hispanics among both MTM-eligible and MTM-ineligible populations. Disparities were greater among MTM-ineligible than MTM-eligible populations (e.g., on additive term, difference in odds=1.94 and P<0.01 for Whites and Blacks; difference in odds=2.86 and P<0.01 for Whites and Hispanics). A few other measures also exhibited significant patterns. CONCLUSIONS MTM eligibility criteria may exacerbate racial and ethnic disparities in health status and some measures of health services utilizations and costs and medication utilization. Future research should examine strategies to remediate the effects of MTM eligibility criteria on disparities.