Precertification for percutaneous transluminal coronary angioplasty in Medicare beneficiaries: a melting pot or a need for better national standards? The Health Care Financing Administration has contracted with state peer review organizations (PROs) in its effort to assure the quality of services and eliminate unreasonable and inappropriate care provided Medicare beneficiaries. By law, each state PRO must select 10 procedures for precertification. Coronary angioplasty has been chosen by 45 PROs for precertification and criteria in each state were developed with the advice of local physicians. This report describes the findings of a survey of these precertification criteria in an effort to determine their variability and to compare the PRO criteria to published national criteria created by expert panels. Current precertification criteria of Medicare beneficiaries show significant variability in the priorities and the clinical practice of cardiologists in performing coronary angioplasty, despite established and published guidelines for its safe and efficacious use. It is likely that the establishment of locally based criteria for coronary angioplasty will be geographically uneven and probably have a less than expected impact on the care provided to Medicare beneficiaries. 