Provider Concentration in Markets for Physician Services for Patients with Traditional Medicare

Health Management, Policy and Innovation, 1(1) 3-18

16 Pages Posted: 12 Dec 2012

See all articles by Samuel A. Kleiner

Samuel A. Kleiner

Government of the United States of America - Federal Trade Commission

Sean Lyons

Cornell University

William White

Cornell University

Date Written: September 14, 2012

Abstract

The geographic extent of markets for physicians is an important but little-explored issue for antitrust. Using patient flow data from a 2009 20% sample of Medicare beneficiaries, we define physician specialty-specific geographic markets for selected communities and calculate concentration within these markets. We find considerable variation in geographic market size by physician specialty and evidence of substantial concentration within physician markets, especially for specialists in smaller geographic areas. Additionally, given that our market definition methodology has been shown to define overly expansive markets, our concentration measures likely reflect a lower bound.

Suggested Citation

Kleiner, Samuel A. and Lyons, Sean and White, William, Provider Concentration in Markets for Physician Services for Patients with Traditional Medicare (September 14, 2012). Health Management, Policy and Innovation, 1(1) 3-18, Available at SSRN: https://ssrn.com/abstract=2187981

Samuel A. Kleiner (Contact Author)

Government of the United States of America - Federal Trade Commission ( email )

600 Pennsylvania Ave., NW
Washington, DC 20580
United States

Sean Lyons

Cornell University ( email )

Ithaca, NY 14853
United States

William White

Cornell University ( email )

120 Martha Van Rensselaer Hall
Ithaca, NY 14853
United States

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