Addressing health care disparities using a health plan quality measures index.

Objectives: To develop an index using publicly available data to measure progress in addressing health care disparities.

Study design: Given inherent socioeconomic differences between individuals insured by commercial/private insurance and those insured by Medicaid, we selected, based on set criteria, a portfolio of metrics comparing the national average performance between these 2 product lines from the Healthcare Effectiveness Data and Information Set (HEDIS).

Methods: Using data from the National Committee for Quality Assurance publicly reported national averages for HEDIS quality metrics from commercial/private insurance and Medicaid managed care, observed differences for these measures were aggregated to establish the index.

Results: The Health Insurance Disparities Index (HeIDI) demonstrated a gradual worsening of disparities nationally between individuals with commercial/private insurance and individuals with Medicaid insurance from 2017 to 2022, with a substantial deterioration during and after the COVID-19 pandemic years.

Conclusions: Because HeIDI assesses the status of health care disparities impacting individuals of lower socioeconomic status by insurance lines, it is useful for assessing performance for health plans, states, regions, and health systems utilizing verified HEDIS data.