Medicare assignment rates and carrier practices: a national study.
D005245:Fee Schedules; D006801:Humans; D007341:Insurance / Q000191:economics*; D007343:Insurance Carriers / Q000191:economics*; D007344:Insurance Claim Reporting; D007357:Insurance, Physician Services / Q000706:statistics & numerical data*; D006278:Medicare / Q000706:statistics & numerical data*; D012044:Regression Analysis; D012959:Socioeconomic Factors; D014481:United States