Implementation Notification for Final Rule CMS-3355-F, Clinical Laboratory Improvement Amendments of 1988 (CLIA) Proficiency Testing - Analytes and Acceptable Performance Final Rule

• This Admin Info memo clarifies that the Proficiency Testing Final Rule (CMS-3355-F) requirements effective July 11, 2024 will be implemented on January 1, 2025. • The implementation date applies to regulations at §§ 493.2 and 493.801 through 493.959.