Erin E. Trish

Title(s)Associate Professor of Pharmaceutical and Health Economics
SchoolUSC School of Pharmacy
AddressVPD 412D
University Park Campus
Los Angeles CA 90089-7273
Phone+1 213 821 6178
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    Dr. Erin Trish is a postdoctoral fellow at the Schaeffer Center for Health Policy and Economics at the University of Southern California and the Fielding School of Public Health at the University of California Los Angeles. She graduated from the Johns Hopkins Bloomberg School of Public health in 2013 with a doctorate in Health Policy and Economics. She also holds a B.S. in Biomedical Engineering from Johns Hopkins University and worked as a research assistant in a stem cell research lab at Harvard University prior to starting graduate school.

    Her research focuses on private health insurance markets in the US, including how the Affordable Care Act may affect how these markets function. Her dissertation work focused on the offsetting effects of the level of competition among insurers on health insurance premiums and on how insurance market regulations affect employers’ decisions about the health benefits they offer. Additionally, she has worked on several other research projects related to the ACA including simulations of the population expected to obtain coverage through the exchanges as well as the risk adjustment programs included in the law.
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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help. to make corrections and additions.
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    Altmetrics Details PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. Prevalence of Medical Payment Products Promoted on US Hospitals' Websites. JAMA Health Forum. 2024 Mar 01; 5(3):e240231. Randall S, Wong N, Rohrer J, Nguyen NL, Trish E, Duffy EL. PMID: 38551590; PMCID: PMC10980956.
      View in: PubMed   Mentions:    Fields:    
    2. Fostering Flexibility: How Medicare Advantage Potentially Accelerated Telehealth Benefits. Inquiry. 2024 Jan-Dec; 61:469580241238671. Grabert LM, McCormack G, Trish E, Wagner KL. PMID: 38450625; PMCID: PMC10921850.
      View in: PubMed   Mentions:    Fields:    Translation:HumansPHPublic Health
    3. Part D beneficiaries' incentives and responses under preferred pharmacy networks. Am J Manag Care. 2023 04; 29(4):180-186. Xu J, Trish E, Joyce G. PMID: 37104832.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    4. Substantial Growth In Medicare Advantage And Implications For Reform. Health Aff (Millwood). 2023 02; 42(2):246-251. Trish E, Valdez S, Ginsburg PB, Randall S, Lieberman SM. PMID: 36745825.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    5. Ground Ambulance Billing And Prices Differ By Ownership Structure. Health Aff (Millwood). 2023 02; 42(2):227-236. Adler L, Ly B, Duffy E, Hannick K, Hall M, Trish E. PMID: 36652633.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    6. Comparison of Estimated No Surprises Act Qualifying Payment Amounts and Payments to In-Network and Out-of-Network Emergency Medicine Professionals. JAMA Health Forum. 2022 09 02; 3(9):e223085. Duffy EL, Biener A, Garmon C, Trish EE. PMID: 36218936; PMCID: PMC9482054.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    7. Insurers negotiate lower hospital prices for HIX than for commercial groups. Am J Manag Care. 2022 Sep 01; 28(9):e347-e350. Randall S, Duffy EL, Green S, Trish E. PMID: 36121367.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    8. Medicare Advantage Plans Pay Large Markups To Consolidated Dialysis Organizations. Health Aff (Millwood). 2022 08; 41(8):1107-1116. Lin E, Ly B, Duffy E, Trish E. PMID: 35914212.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    9. Reforming the Medicare Part D Benefit Design: Financial Implications for Beneficiaries, Private Plans, Drug Manufacturers, and the Federal Government. J Health Polit Policy Law. 2022 Jul 14. Trish E, Kaiser KM, Celestin J, Joyce G. PMID: 35867529.
      View in: PubMed   Mentions:    Fields:    
    10. Dispute Resolution Outcomes for Surprise Bills in Texas. JAMA. 2022 06 21; 327(23):2350-2351. Duffy EL, Adler L, Chartock BL, Trish E. PMID: 35727286; PMCID: PMC9214586.
      View in: PubMed   Mentions:    Fields:    
    11. Pharmacy switching in response to preferred pharmacy networks in Medicare Part D. Health Serv Res. 2022 10; 57(5):1112-1120. Xu J, Trish E, Joyce G. PMID: 35297507; PMCID: PMC9441277.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    12. Comparison of Spending on Common Generic Drugs by Medicare vs Costco Members. JAMA Intern Med. 2021 10 01; 181(10):1414-1416. Trish E, Gascue L, Ribero R, Van Nuys K, Joyce G. PMID: 34228050; PMCID: PMC8261681.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    13. Commercial and Medicare Advantage payment for anesthesiology services. Am J Manag Care. 2021 06 01; 27(6):e195-e200. Duffy EL, Ly B, Adler L, Trish E. PMID: 34156223.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    14. Payment for Dialysis Services in the Individual Market. JAMA Intern Med. 2021 05 01; 181(5):698-699. Trish E, Fiedler M, Ning N, Gascue L, Adler L, Lin E. PMID: 33749739; PMCID: PMC7985814.
      View in: PubMed   Mentions: 10     Fields:    Translation:HumansCells
    15. Emergency Physicians Recover A Higher Share Of Charges From Out-Of-Network Care Than From In-Network Care. Health Aff (Millwood). 2021 04; 40(4):622-628. Biener AI, Chartock BL, Garmon C, Trish E. PMID: 33819102.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    16. Association of Out-of-Pocket Spending With Insulin Adherence in Medicare Part D. JAMA Netw Open. 2021 01 04; 4(1):e2033988. Trish E, Kaiser K, Joyce G. PMID: 33496792; PMCID: PMC7838924.
      View in: PubMed   Mentions: 5     Fields:    Translation:Humans
    17. Arbitration Over Out-Of-Network Medical Bills: Evidence From New Jersey Payment Disputes. Health Aff (Millwood). 2021 01; 40(1):130-137. Chartock BL, Adler L, Ly B, Duffy E, Trish E. PMID: 33400578.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    18. Policies to address surprise billing can affect health insurance premiums. Am J Manag Care. 2020 09; 26(9):401-404. Duffy EL, Ly B, Adler L, Trish E. PMID: 32930553.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    19. Out-of-Network Air Ambulance Bills: Prevalence, Magnitude, and Policy Solutions. Milbank Q. 2020 09; 98(3):747-774. Fuse Brown EC, Trish E, Ly B, Hall M, Adler L. PMID: 32525223; PMCID: PMC7482379.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    20. Prevalence And Characteristics Of Surprise Out-Of-Network Bills From Professionals In Ambulatory Surgery Centers. Health Aff (Millwood). 2020 05; 39(5):783-790. Duffy EL, Adler L, Ginsburg PB, Trish E. PMID: 32293916.
      View in: PubMed   Mentions: 7     Fields:    Translation:Humans
    21. Who Pays in Medicare Part D? Giving Plans More Skin in the Game. N Engl J Med. 2019 Dec 19; 381(25):2384-2387. Trish EE, Ginsburg PB, Joyce GF, Goldman DP. PMID: 31747509; PMCID: PMC7081715.
      View in: PubMed   Mentions: 2     Fields:    
    22. Medicare Part D: Time for Re-Modernization? Health Serv Res. 2019 12; 54(6):1174-1183. Trish EE. PMID: 31667832; PMCID: PMC6863238.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    23. Incorporating Prescription Drug Utilization Information Into the Marketplace Risk Adjustment Model Improves Payment Accuracy and Reduces Adverse Selection Incentives. Med Care Res Rev. 2021 08; 78(4):381-391. Xu J, Trish E, Joyce G. PMID: 31434536.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    24. Do health insurance and hospital market concentration influence hospital patients' experience of care? Health Serv Res. 2019 08; 54(4):805-815. Hanson C, Herring B, Trish E. PMID: 31095743; PMCID: PMC6606537.
      View in: PubMed   Mentions: 4     Fields:    Translation:Humans
    25. Geographic variation in the delivery of high-value inpatient care. PLoS One. 2019; 14(3):e0213647. Romley J, Trish E, Goldman D, Beeuwkes Buntin M, He Y, Ginsburg P. PMID: 30908492; PMCID: PMC6433342.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    26. Reducing Unfair Out-of-Network Billing - Integrated Approaches to Protecting Patients. N Engl J Med. 2019 Feb 14; 380(7):610-612. Hall MA, Adler L, Ginsburg PB, Trish E. PMID: 30650002.
      View in: PubMed   Mentions: 5     Fields:    Translation:Humans
    27. Quantifying Overinsurance Tied to the Tax Exclusion for Employment-Based Health Insurance and Its Variation by Health Status. Inquiry. 2019 Jan-Dec; 56:46958019893857. Herring B, Trish E. PMID: 31823664; PMCID: PMC6906432.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    28. Provider-owned insurers in the individual market. Am J Manag Care. 2018 12 01; 24(12):e393-e398. Howard DH, Herring B, Graves J, Trish E. PMID: 30586488.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    29. Growing Number Of Unsubsidized Part D Beneficiaries With Catastrophic Spending Suggests Need For An Out-Of-Pocket Cap. Health Aff (Millwood). 2018 07; 37(7):1048-1056. Trish E, Xu J, Joyce G. PMID: 29985706; PMCID: PMC7268910.
      View in: PubMed   Mentions: 6     Fields:    
    30. Financial burden of healthcare utilization in consumer-directed health plans. Am J Manag Care. 2018 04 01; 24(4):e115-e121. Zhang X, Trish E, Sood N. PMID: 29668214.
      View in: PubMed   Mentions: 3     Fields:    Translation:Humans
    31. Provider-owned insurers. Am J Manag Care. 2017 09; 23(9):566-567. Howard DH, Trish E. PMID: 29087154.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    32. Physician Reimbursement in Medicare Advantage Compared With Traditional Medicare and Commercial Health Insurance. JAMA Intern Med. 2017 09 01; 177(9):1287-1295. Trish E, Ginsburg P, Gascue L, Joyce G. PMID: 28692718; PMCID: PMC5710575.
      View in: PubMed   Mentions: 14     Fields:    Translation:Humans
    33. Does Limiting Allowable Rating Variation in the Small Group Health Insurance Market Affect Employer Self-Insurance? J Risk Insur. 2018 Sep; 85(3):607-633. Trish E, Herring B. PMID: 30100626; PMCID: PMC6082633.
      View in: PubMed   Mentions: 1  
    34. Medicare Beneficiaries Face Growing Out-Of-Pocket Burden For Specialty Drugs While In Catastrophic Coverage Phase. Health Aff (Millwood). 2016 09 01; 35(9):1564-71. Trish E, Xu J, Joyce G. PMID: 27605634; PMCID: PMC5573178.
      View in: PubMed   Mentions: 13     Fields:    Translation:Humans
    35. Explaining the Growth in US Health Care Spending Using State-Level Variation in Income, Insurance, and Provider Market Dynamics. Inquiry. 2015; 52. Herring B, Trish E. PMID: 26655685; PMCID: PMC5678448.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    36. The Distributional Effects of the Affordable Care Act's Cadillac Tax by Worker Income. AMA J Ethics. 2015 Jul 01; 17(7):672-9. Herring B, Trish E. PMID: 26158816; PMCID: PMC5663467.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    37. How do health insurer market concentration and bargaining power with hospitals affect health insurance premiums? J Health Econ. 2015 Jul; 42:104-14. Trish EE, Herring BJ. PMID: 25910690; PMCID: PMC5667641.
      View in: PubMed   Mentions: 13     Fields:    
    38. Specialty drug spending trends among Medicare and Medicare Advantage enrollees, 2007-11. Health Aff (Millwood). 2014 Nov; 33(11):2018-24. Trish E, Joyce G, Goldman DP. PMID: 25367998; PMCID: PMC4250050.
      View in: PubMed   Mentions: 8     Fields:    Translation:Humans
    39. Adjusting for risk selection in state health insurance exchanges will be critically important and feasible, but not easy. Health Aff (Millwood). 2012 Feb; 31(2):306-15. Weiner JP, Trish E, Abrams C, Lemke K. PMID: 22323160.
      View in: PubMed   Mentions: 8     Fields:    
    40. Human ES cells: starting culture from frozen cells. J Vis Exp. 2006 Nov 09; (1):86. Trish E, Dimos J, Eggan K. PMID: 18704174; PMCID: PMC2504448.
      View in: PubMed   Mentions:    Fields:    Translation:HumansAnimalsCells
    41. Freezing human ES cells. J Vis Exp. 2006 Oct 12; (1):50. Trish E, Dimos J, Eggan K. PMID: 18704182; PMCID: PMC2504456.
      View in: PubMed   Mentions: 1     Fields:    Translation:HumansCells
    42. Passaging HuES human embryonic stem cell-lines with trypsin. J Vis Exp. 2006 Oct 12; (1):49. Trish E, Dimos J, Eggan K. PMID: 18704181; PMCID: PMC2504455.
      View in: PubMed   Mentions: 1     Fields:    Translation:HumansAnimalsCells
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