Background
The Medicare Prescription Drug, Improvement, and Modernization Act (MMA) requires Part D plans to establish programs to provide medication therapy management (MTM) services starting from 2006. MTM services have been found to improve patient outcomes from pharmacotherapy, reduce emergency room visits and hospitalizations, and reduce health care costs in a cost-effective fashion. However, previous research found that Non-Hispanic Blacks (Blacks) and Hispanics may be less likely to be eligible for MTM services than Non-Hispanic Whites (Whites) among the Medicare population according to current Medicare MTM eligibility criteria. This is because the Medicare MTM eligibility criteria are predominantly based on medication utilization and costs, while Blacks and Hispanics tend to use fewer prescription medications and incur lower prescription medication costs. The Patient Protection and Affordable Care Act (PPACA) laid out a set of MTM eligibility criteria for eligible entities to target patients for MTM services: “(1) take 4 or more prescribed medications …; (2) take any ‘high risk’ medications; (3) have 2 or more chronic diseases… or (4) have undergone a transition of care, or other factors… that are likely to create a high risk of medication-related problems.”
Objectives
This study aimed to examine (1) racial/ethnic disparities in meeting the eligibility criteria for MTM services in PPACA among the Medicare population; and (2) whether there would be greater disparities in health and economic outcomes among MTM-ineligible than MTM-eligible groups. (If so, the PPACA MTM eligibility criteria may aggravate existing disparities.)
Methods
This was a retrospective cross-sectional analysis of Medicare Current Beneficiaries Survey (MCBS; 2007–2008). To determine medication characteristics, the Food and Drug Administration’s Electronic Orange Book was also used. Proportions of population eligible for MTM services based on the PPACA MTM eligibility criteria were compared across racial and ethnic groups using a chi-square test; a logistic regression model was used to adjust for population socio-demographic and health characteristics. Health and economic outcomes examined included health status (self-perceived good health status, number of chronic diseases, activities of daily living or ADLs, and instrumental activities of daily living or IADLs), health services utilization and costs (physician visits, emergency room visits, and total health care costs), and medication utilization patterns (generic dispensing ratio). To determine difference in disparities across MTM eligibility categories, difference-in-differences regressions of various functional forms were employed depending on the nature of the dependent variables. Interaction terms between the dummy variables for minority groups (e.g., Blacks or Hispanics) and MTM eligibility were included to test whether disparity patterns varied between MTM-ineligible and MTM-eligible individuals.
Results
The sample consisted of 12,966 Medicare beneficiaries, of which 11,...