What is a prosthetist or orthotist? Credentials and licensing explained
How prosthetists and orthotists are trained, what CPO, CP, CO and BOC credentials mean, which states license them, and how facility accreditation differs.
People often use the words prosthetist and orthotist interchangeably, but they describe two related roles. A prosthetist designs and fits artificial limbs. An orthotist designs and fits braces and supports, called orthoses, for a weak, injured or misaligned part of the body. Many clinicians hold credentials in both areas. This guide explains what the letters after a clinician's name mean, how licensing works, and how practitioners differ from the facilities where they work.
Prosthetist versus orthotist
- Prosthetist: works with people who have limb loss or limb difference and provides devices that replace part or all of an arm or leg.
- Orthotist: works with people who need external support or correction, for example an ankle-foot orthosis, a knee brace, a spinal brace or a custom foot orthosis.
- Prosthetist/orthotist: a clinician credentialed in both disciplines.
Other roles exist in the same clinic, including technicians who fabricate devices, assistants, orthotic fitters, and pedorthists who focus on footwear and foot-related devices. These roles carry different credentials and different scopes of practice.
National certification
Two national organizations certify O&P practitioners. The American Board for Certification in Orthotics, Prosthetics and Pedorthics (ABC) awards the credentials CO (Certified Orthotist), CP (Certified Prosthetist) and CPO (Certified Prosthetist Orthotist). The Board of Certification/Accreditation (BOC) also certifies orthotists and prosthetists, along with other roles such as orthotic fitters and pedorthists. Many clinicians hold credentials from one board, and some hold both.
Certification is voluntary in many states, but it is the usual way an employer, payer or patient can confirm that a practitioner met a national standard. Each board publishes a directory where you can look up a person and confirm that a credential is current.
Education and residency
According to ABC's eligibility pages, candidates for the orthotist and prosthetist exams need a master's degree in orthotics and prosthetics from a program accredited through the Commission on Accreditation of Allied Health Education Programs (CAAHEP). After the degree, candidates complete a supervised clinical residency. The National Commission on Orthotic and Prosthetic Education (NCOPE) accredits residency programs and facilities that host residents. Its standards describe a residency of 12 months for a single discipline or 18 months for both disciplines, supervised by a licensed or certified practitioner. ABC has also announced that completing a residency will be required for exam candidates beginning January 1, 2028. Because requirements change, check the current rules on the ABC eligibility page.
Certification is maintained through continuing education. A credential that is listed as current in the board's directory means the practitioner has kept up with those requirements.
State licensure
Licensing is set by each state, not by the federal government, and it varies. ABC's state licensure map currently lists individual practitioner licensure in states including Alabama, Arkansas, Florida, Georgia, Illinois, Iowa, Kentucky, Minnesota, New Jersey, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas and Washington. The same page notes that Idaho, Mississippi, Nevada and North Dakota have certification requirements without issuing licenses, and that Louisiana and Arizona use facility accreditation requirements for custom-fabricated devices. Laws are amended over time, so confirm details with the state agency. For example, Texas licenses O&P practitioners through the Texas Department of Licensing and Regulation, and Washington through the Department of Health.
In states without licensure, anyone may legally offer O&P services, which is one reason national certification is useful to check. In states with licensure, you can usually verify a license on the state board's public lookup.
Practitioner credentials versus facility accreditation
A practitioner credential describes a person. Facility accreditation describes a business location, its equipment, record keeping and patient care processes. ABC and BOC both accredit facilities. Medicare requires suppliers of prosthetics and orthotics to be accredited, and ABC's accreditation program has been approved by CMS for that purpose. A facility can be accredited while some of its staff are not certified, so it helps to ask about both. The ABC directory and the BOC directory allow you to search for individuals and facilities.
How to check a provider
- Search the ABC or BOC directory for the practitioner's name and confirm that the credential is current.
- If your state licenses practitioners, look up the license on the state board site.
- Ask which practitioner will personally evaluate and fit you, and what credentials that person holds.
- Ask whether the facility is accredited and by which organization.
Credentials do not guarantee a good fit or outcome, but they are a reasonable starting point when comparing clinics. The Amputee Coalition also offers guidance on locating a certified prosthetist.