​Analytics and Research Services

Thank you for visiting the ASA Analytics and Research Services (ARS). We hope that the materials on these pages are useful for ASA members and anyone else interested in the field of anesthesia. If you have any questions, feel free to send us an email ask.ARS@asahq.org.

ARS Data Briefs

For additional workforce-related Data Briefs go to the Anesthesia Workforce Publications and Presentations located on the ASA Center for Anesthesia Workforce Studies (CAWS) webpage.

Access short reports on perioperative and industry characteristics relevant to anesthesiology (Member Exclusive)

• Analytics and Research Services. State-Level Medicare Fee-for-Service Allowed Claims and Charges by Anesthesia Modifier, 2024. Analytics and Research Services Data Brief ARS–26.0017.V03. Schaumburg, IL: American Society of Anesthesiologists; January 2026.
• Analytics and Research Services. Six Largest Publicly Traded Health Insurance Companies, 2025. Analytics and Research Services Data Brief ARS–26.0007.V03. Schaumburg, IL: American Society of Anesthesiologists; March 2026.
• Analytics and Research Services. Commercial Insurance Market Share and Concentration, 2024. Analytics and Research Services Data Brief ARS–26.0019.V02. Schaumburg, IL: American Society of Anesthesiologists; March 2026.
• Analytics and Research Services. Trends in Medicare-certified Ambulatory Surgery Centers, 2014–2024. Analytics and Research Services Data Brief ARS–25.0003.V02. Schaumburg, IL: American Society of Anesthesiologists; December 2025.

The Curious Economist

Brief articles on health economics published in the ASA Monitor (Member Exclusive)

• Miller TR. Revisiting the Insurer Six-Pack and Their Medicare Advantage Positions. ASA Monitor. 2025;89(7):1,7–8.
• Miller TR. A decade of decompensation: A shrinking piece of the Medicare fee-for-service Part B pie. ASA Monitor. Online First: March 14, 2025.
• Miller TR. One for the Ages. ASA Monitor. 2025;89(2):1–8.
• Miller TR. Generations Research of Limited Value in Studying Workforce Economics. ASA Monitor. 2023;87(2):1–6.
• Miller TR. Responses to 2 Workforce Questions from Curious Readers. ASA Monitor. 2022;86(11):1–8.
• Miller TR. The Trillion Dollar Six-Pack of Publicly Traded Health Insurance Companies. ASA Monitor. 2022;86(5):1–11.
• Miller TR. Where Are They? A Look at New Anesthesia Professionals Billing Medicare. ASA Monitor. 2022;86(3):1–11.
• Miller TR. How Much Does That Non-Physician Anesthetist Cost? ASA Monitor. 2022;86(1):1–7.
• Miller TR. Goldilocks, the Devil, and Physician Supply and Demand. ASA Monitor. 2021;85(9):14–15.
• Miller TR. Market Concentration in Health Care. ASA Monitor. 2021;85(6):16–17.
• Miller TR. Assessing Returns on Investment in Education and Training. ASA Monitor. 2021;85(4):16–17.
• Miller TR. Cost-Effectiveness Analysis and Equity – Not so Easy Does It. ASA Monitor. 2020;84(12):24–36.
• Miller TR. The Health Care Cost Elephant. ASA Monitor. 2020;84(10):23–24.
• Miller TR. The Demand for Medical Care. ASA Monitor. 2020;84(8):22–23.

Peer-Reviewed Publications Co-Authored by ASA ARS

ASA ARS has co-authored 17 articles recently accepted or published in influential journals:

• Ensor CL, Pregler JL, Abouleish A, Cohen NH, Miller TR, Gal JS. Highlighting variability in Medicare payments for anesthesia units: Rural pass-through
  versus Medicare anesthesia conversion factor. Anesthesiology. 2025;142(1):238–240.
• Lin DM, Lane-Fall MB, Lea JA, Reede LJ, Games BD, Xia Y, Rock-Klotz JA, Miller TR. Workplace violence pervasiveness in the perioperative environment: A multiprofessional survey. Jt Comm J Qual Patient Saf. 2024;50(11),764–74.
• Liang CJ, Gal JS, Miller TR, Hannenberg AA. Medicare payment trends compared to inflation for anesthesia services. J Clinical Anesth. 2024;97, 11505.
• Sekeres G, Miller TR, Mariano ER, Glance LG, Sun EC. Association between anesthesia group size and merit-based incentive payment system scores. Anesthesiology. 2024;140(4):853–55.
• Peden CJ, Miller TR, Deiner SG, Eckenoff RG, Fleisher LA, and Members of the Perioperative Brain Health Expert Panel. Improving perioperative brain health: An expert consensus review of key action for the perioperative care team. Br J Anaesth. 2021;126(2):423–32.
• Miller TR, Radcliff TA. Economic shocks from the novel COVID-2019 pandemic for anesthesiologists and their practices. Anesth Analg. 2020;131(1):112–16.
• Deiner S, Fleisher LA, Leung JM, Peden C, Miller T, Neuman M, et al. Adherence to recommended practices for perioperative anesthesia care for older adults among US anesthesiologists: Results from the ASA Committee on Geriatric Anesthesia Perioperative Brain Health Initiative ASA member survey. Perioper Med. 2020;9:6.
• Udoji MA, Ifeanyi-Pillette IC, Miller TR, Lin DM. Workplace violence against anesthesiologists: We are not immune to this patient safety threat. Int
  Anesthesiol Clin.2019;57(3):123–37.
• Sun E, Miller TR, Moshfegh J, Baker LC. Anesthesia care team composition and surgical outcomes. Anesthesiology.2018;129(4):700-09.
• Bita AK, Ohbet C, Halzack NM, Miller TR. Measuring team effectiveness in the health care setting: An inventory of survey tools. Health Serv Insights.2018;11:1–18.
• Schneider JE, Ohsfeldt R, Li R, Miller TR, Scheibling C. Assessing the impact of state "opt-out" policy on access to and costs of surgeries and other procedures requiring anesthesia services. Health Econ Rev. 2017;7(1):10.
• Sun EC, Dexter F, Miller TR, Baker LC. "Opt out" and access to anesthesia care for elective and urgent surgeries among U.S. Medicare beneficiaries. Anesthesiology. 2017;126(3):461–71.
• Ohsfeldt RL, Miller TR, Scheider JE, Scheibling CM. Cost impact of unexpected disposition after orthopedic ambulatory surgery associated with category of anesthesia provider. J Clin Anesth. 2016;35:157–62.
• Sun E, Dexter F, Miller TR. The effect of "opt-out" regulation on access to surgical care for urgent cases in the United States: Evidence from the National Inpatient Sample. Anesth Analg. 2016;122(6):1983–91.
• Sun EC, Miller TR, Halzack NM. In the United States, "Opt-out" states show no increase in access to anesthesia services for Medicare beneficiaries compared to non-"opt-out" states. A A Case Rep. 2016;6(9):283–85.
• Miller TR, Abouleish A, Halzack NM. Anesthesiologists are affiliated with many hospitals only reporting anesthesia claims using Modifier QZ for Medicare claims in 2013. A A Case Rep. 2016;6(7):217–19.
• Sun EC, Dexter F, Macario A, Miller TR, Baker LC. No significant association between anesthesia group concentration and private insurer payments in the United States. Anesthesiology. 123(3):507–14.

ARS Background, Mission, and Goals

ASA established a Department of Health Policy Research (HPR) on August 27, 2012. An 18-member physician advisory group, which included 5 members of the Administrative Council, met regularly via conference call to discuss progress on the implementation of the HPR initiative (ASA Strategy 1.5), including key issues, priority of specific action items, and potential new opportunities. HPR was renamed to Analytics and Research Services (ARS) on November 17, 2016 to better reflect its mission and goals.

The mission of ASA ARS (draft statement) is to review, support and conduct analyses and research which provide insights to ASA and its members for the advancement of the specialty of anesthesiology.

To achieve its mission, ARS established the following three major goals (also draft, not yet official):

• Conduct analyses and research to define the value of physician anesthesiologists and anesthesia subspecialties and to identify ways to advance the practice of anesthesiology throughout the continuum of care.
• Conduct research as requested by ASA leadership to support the ASA strategic goals and needs of ASA committees and departments.
• Collaborate with other physician and health care organizations in research and analytics that advance the role of anesthesiologists.

ARS has identified numerous action items and several are underway within each goal. A summary of selected key projects and initiatives is provided here (ASA Members only).

View useful resources related to health services and health policy research, including material developed by ARS.