Researchers and patient advocates have raised concerns about the accuracy of self-reported data on Care Compare, the Medicare and Medicaid website that publicly reports facility-level quality and safety measures of certified facilities, including nursing homes. This study used hospital claims to determine the percentage of nursing home residents admitted to a hospital for a urinary tract infection (UTI) and compared that number to rates reported on Care Compare. The results show only 79% of claims-based UTIs were reported by the facility. Reporting rates for Black residents or nursing homes with a higher percentage of Black residents were even lower.