Effect on employers' costs difficult to measure, says GAO.
D017046:Cost Savings; D017049:Employer Health Costs / Q000639:trends*; D006077:Government Agencies; D006264:Health Benefit Plans, Employee / Q000191:economics* / Q000639:trends; D006302:Health Services Research; D008329:Managed Care Programs / Q000191:economics*; D014481:United States