Non-pilot Audits: California hospital PCI data that is submitted individually or at 3 month harvests to the NCDR® central database is reviewed for completeness and data accuracy by NCDR® and receives a red, yellow, or green light before acceptance. The vast majority of the hospitals in California that perform PCI participate in the NCDR CathPCI registry. The NCDR® in addition to employing robust data quality strategies for its participating hospitals also performs a limited number of site audits to directly assess data accuracy. The complete NCDR® non-pilot California data is downloaded annually to the UCD central site for comparison analysis. The downloaded data is masked to protect patient, operator, and hospital identity.