Cardiac Rehabilitation Patient Referral Percentage of patients aged 18 years for whom PCI is performed who have been referred to an outpatient cardiac rehabilitation / secondary prevention program. 9. Regional or National PCI Registry Participation Participation in a national or multisystem geographic regional PCI registry that provides regular performance reports based on benchmarked data. 10. Annual Operator PCI Volume Average annual volume of PCIs performed by an operator over the previous 2 calendar years. 11. Annual Hospital PCI Volume Annual volume of PCIs performed by a hospital over the previous calendar year. *For comprehensive information on these measures, including measure exceptions, please refer to the complete ACC/AHA/AMA-PCPI/NCQA/SCAI performance measurement specifications through the PCPI Web site (http://www.ama-assn.org/apps/listserv/x-check/qmeasure.cgi?submit=PCPI). These measures have been designated performance measures. Performance measures are process, structure, efficiency, or outcome measures that have been developed with ACCF/AHA methodology, including the process of public comment and peer review, and have been specifically designated as performance measures by the ACC/AHA Task Force on Performance Measures. These measures not only are intended for internal quality improvement but also may be considered for purposes of public reporting or other forms of accountability. Indicated in shading, these measures have been designated quality metrics. Quality metrics are measures that have been developed to support self-assessment and quality improvement at the provider, hospital, or healthcare system level. These metrics are valuable tools to aid clinicians and hospitals in improving quality of care and enhancing patient outcomes but might not meet all specifications of formal performance measures and are, therefore, not appropriate for any use other than internal quality improvement. ACC indicates American College of Cardiology; AHA, American Heart Association; AMA-PCPI, American Medical Association Physician Consortium for Performance Improvement; NCQA, National Committee for Quality Assurance; PCI, percutaneous coronary intervention; and SCAI, Society for Cardiovascular Angiography and Interventions. 