title: Trends in HMO/PPO administration.
mesh_terms: D005102:Health Expenditures / Q000639:trends; D006279:Health Maintenance Organizations / Q000458:organization & administration*; D007348:Insurance, Health / Q000458:organization & administration*; D011243:Preferred Provider Organizations / Q000458:organization & administration*; D013223:Statistics as Topic; D014481:United States