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Impact of implementing electronic prior authorization on medication filling in an electronic health record system in a large healthcare system

Description

Lauffenburger JC, Stults CD, Mudiganti S, Yan X, Dean-Gilley LM, He M, Tong A, Fischer MA, J Am Med Inform Assoc.ocab119. doi: 10.1093/jamia/ocab119. Online ahead of print., 2021 Jul 19

Investigators

Cheryl Stults, Ph.D., Assistant Scientist, Xiaowei (Sherry) Yan, PhD, MS

Abstract

Objective: Medications frequently require prior authorization from payers before filling is authorized. Obtaining prior authorization can create delays in filling prescriptions and ultimately reduce patient adherence to medication. Electronic prior authorization (ePA), embedded in the electronic health record (EHR), could remove some barriers but has not been rigorously evaluated. We sought to evaluate the impact of implementing an ePA system on prescription filling.

Materials and methods: ePA was implemented in 2 phases in September and November 2018 in a large US healthcare system. This staggered implementation enabled the later-implementing sites to be controls. Using EHR data from all prescriptions written and linked information on whether prescriptions were filled at pharmacies, we 1:1 matched ePA prescriptions with non-ePA prescriptions for the same insurance plan, medication, and site, before and after ePA implementation, to evaluate primary adherence, or the proportion of prescriptions filled within 30 days, using generalized estimating equations. We also conducted concurrent analyses across sites during the peri-implementation period (Sept-Oct 2018).

Results: Of 74 546 eligible ePA prescriptions, 38 851 were matched with preimplementation controls. In total, 24 930 (64.2%) ePA prescriptions were filled compared with 26 731 (68.8%) control prescriptions (Adjusted Relative Risk [aRR]: 0.92, 95%CI: 0.91-0.93). Concurrent analyses revealed similar findings (64.7% for ePA vs 62.3% control prescriptions, aRR: 1.03, 95%CI: 0.98-1.09).

Discussion: Challenges with implementation, such as misfiring and insurance fragmentation, could have undermined its effectiveness, providing implications for other health informatics interventions deployed in outpatient care.

Conclusion: Despite increasing interest in implementing ePA to improve prescription filling, adoption did not change medication adherence.

Pubmed Abstract

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Associated Topics

  • EHR Data
  • Medical Informatics

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