A hospital’s CMS’ Certification Number (CCN), is the hospital’s identification number and is linked to its Medicare provider agreement. The CCN is used for CMS certification. Certain types of health care facilities, including hospitals, seeking to participate in the Medicare program are required not only to satisfactorily complete the Medicare enrollment application, but also to be certified as meeting the Medicare health and safety standards. The CCN is also used for submitting and reviewing the hospital’s cost reports. The CCN number used to be called the “provider number,” but with the advent of the statutorily mandated National Provider Identifier (NPI) number for claims processing, the CCN now plays a different role within the Medicare program. • How does a hospital get a CCN? A hospital that seeks to participate in the Medicare program must first submit Form CMS 855A, Medicare Enrollment Application for Institutional Providers, to its regional Medicare Administrative Contractor o