Congenital Maintenance of Certification (CHS MOC) 
In order to maintain a valid subspecialty certificate in congenital cardiac surgery, all Diplomates whose status is Active or Inactive, are required to participate in MOC. The full ABTS MOC cycle is 10 years, with benchmarks or milestones at the 5- and 10-year that must be fulfilled. A brief description of the four components of MOC that make up the 5-year and 10-year Milestones follows:  

Part I - Professional Standing 
Diplomates must hold a valid, unrestricted medical license in at least one state or jurisdiction in the United States, its territories or Canada. 

Part II - Lifelong Learning and Self-Assessment 
Diplomates must participate in educational and self-assessment programs that meet specialty-specific standards that are set by the ABTS. 

Part III - Cognitive Expertise 
Diplomates must demonstrate, through formalized examination, that they have the fundamental, practice-related and practice environment-related knowledge to provide quality care in thoracic surgery.
Part IV - Practice Performance Assessment / Performance Improvement
Diplomates are evaluated in their clinical practice according to standards for patient care in thoracic surgery. Diplomates must demonstrate that they have assessed the quality of care they provide compared to peers and national milestones and then apply the best evidence or consensus recommendations to improve that care using follow-up assessments.