Practitioners start with a letter followed by 7 digits. Each practitioner type has a designated letter as follows:
- Physician: "D", "H", "X", "T"
- Athletic Trainers "A"
- Perfusionist-Basic "B"
- Physician Assistant "C"
- Limited X-Ray Machine Operator "E"
- Genetic Counselor "G"
- Naturopathic Doctors "J"
- Radiologist Assistants "K"
- Respiratory Care Practitioners "L"
- Radiographers and Radiation Therapists "M"
- Nuclear Medicine Technologists "N"
- Radiation Therapists "O"
- Radiographers "R"
- Psychiatrist Assistants "S"
- Supervised Genetic Counselor "U"
- Perfusionist-Advanced "Y"
- Polysomnographic Technologist "Z"