Racial and ethnic disparities in the enrolment of medicare medication therapy management programs.

Objectives: Racial/ethnic disparities have been found in prior literature examining enrolment in Medicare medication therapy management programs. However, those studies were based on various eligibility scenarios because enrolment data were unavailable. This study tested for potential disparities in enrolment using actual MTM enrolment data.

Methods: Medicare Parts A&B claims, Medication Therapy Management Data Files, and the Area Health Resources File from 2013 to 2014 and 2016 to 2017 were analysed in this retrospective analysis. An adjusted logistic regression compared odds of enrolment between racial/ethnic minorities and non-Hispanic Whites (Whites) in the total sample and subpopulations with diabetes, hypertension, or hyperlipidaemia. Trends in disparities were analysed by including interaction terms in regressions between dummy variables for race/ethnic minority groups and period 2016-2017.

Key Findings: Disparities in MTM enrolment were detected between Blacks and Whites with diabetes in 2013-2014 (Odds Ratio = 0.78, 95% Confidence Interval = 0.75-0.81). This disparity improved from 2013-2014 to 2016-2017 for Blacks (Odds Ratio=1.08, 95% Confidence Interval = 1.04-1.11) but persisted in 2016-2017 (Odds Ratio = 0.84, 95% Confidence Interval = 0.81-0.87). A disparity was identified between Blacks and Whites with hypertension in 2013-2014 (Odds Ratio = 0.92, 95% Confidence Interval = 0.89-0.95) but not in 2016-2017. Enrolment for all groups, however, declined between periods. For example, in the total sample, the odds of enrolment declined from 2013-2014 to 2016-2017 by 22% (Odds Ratio=0.78, 95% Confidence Interval=0.75-0.81).

Conclusions: Racial disparities in MTM enrolment were found between Blacks and Whites among Medicare beneficiaries with diabetes in both periods and among individuals with hypertension in 2013-2014. As overall enrolment fell between periods, concerns about program enrolment remain.