title: Effects of HMOs on the creation of competitive markets for hospital services.
abstract: Why do health maintenance organizations (HMOs) use particular hospitals, and do they concentrate patients in hospitals where they obtain low prices? We answered these questions with a study of six HMOs in four large metropolitan areas in 1986. A two-part model was estimated for the probability that a hospital would be used and the demand for general inpatient admissions at hospitals that were used. Four staff-network plans in our study do shop for hospital services on the basis of price more than was generally believed. However, two independent practice association (IPAs) plans use more hospitals in the community and do not concentrate patients effectively at hospitals that offer the lowest prices.
authors: University of Minnesota, Minneapolis, MN 59455.
authors: R
authors: R
authors: Feldman
authors: H C
authors: HC
authors: Chan
authors: J
authors: J
authors: Kralewski
authors: B
authors: B
authors: Dowd
authors: J
authors: J
authors: Shapiro
mesh_terms: D001509:Bed Occupancy / Q000706:statistics & numerical data; D003625:Data Collection; D004465:Economic Competition; D005249:Fees and Charges; D006279:Health Maintenance Organizations / Q000191:economics*; D006301:Health Services Needs and Demand / Q000191:economics; D006761:Hospitals / Q000706:statistics & numerical data*; D015233:Models, Statistical; D010067:Ownership; D010343:Patient Admission / Q000706:statistics & numerical data; D014481:United States