Medical credentialing is the process in which medical facilities and groups review licensed health professionals’ qualifications to ensure they have the required experience and training to safely and effectively practice medicine. These qualifications include medical licenses, specialty certificates, education training, work history, residency, and other training. This credentialing process must be completed each and every time a health care worker starts at a new practice. Following the initial credentialing process, a health care worker must be re-credentialed every two years.