Misclassification Risk of Tier-Based Physician Quality Performance Systems

Relative contribution of pharmacists and primary care providers to shared quality measures

Background

Alternative payment models are common for both primary care providers and pharmacies. These models rely on quality measures to determine reimbursement, and pharmacists and primary care providers can contribute to performance on a similar set of medication-related measures. Therefore, payers need to decide which provider to incentivize for which measures when both are included in alternative payment models.

Objectives

To explore the relative contribution of pharmacies and primary care group practices to a range of quality measures.

Methods

This retrospective cross-sectional study used Medicare Part A, B, and D claims for a 20% random sample of Medicare beneficiaries for 2014–2016. Eight quality measures were selected from the Merit-based Incentive Payment System and Medicare Part D Stars Ratings. Measures included medication adherence measures, appropriate prescribing measures such as high-risk medication use in the elderly, statin use in persons with diabetes (SUPD), and others. The residual intraclass correlation coefficient (RICC) was used to estimate the contribution of pharmacists and primary care providers to measure variation. To estimate the relative contribution across provider types, the pharmacy RICC was divided by the group practice RICC to yield a RICC ratio.

Results

Due to varying measure eligibility requirements, the number of patients per measure ranged from 179,430 to 2,226,129. Across all measures, the RICC values were low, ranging from 0.013 for SUPD to 0.145 for adult sinusitis. Adherence measures had the highest RICC ratios (1.15–1.44), and the annual influenza vaccination measure had the lowest (0.56).

Discussion and conclusions

The relative contributions of pharmacists and primary care providers vary across quality measures. As payers design payment models with measures to which pharmacists and primary care providers can contribute, the RICC ratio may be useful in aligning incentives to the providers with the greatest relative contributions. Additional research is needed to validate this method and extend it to additional sets of providers.

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Comparing RICC ratios across provider groups can guide payer decisions on measures to include in alternative payment models.

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Absolute RICC values may be useful for inferring measure reliability

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Pharmacists had greatest relative contributions to adherence measures

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Primary care providers had greatest relative contributions to non-medication related measures