Prescribing (Medical) Psychologist

Psychologists hold a doctoral degree (PhD, PsyD or EdD) and are licensed by a state board. They provide talk therapy and are the only non-physician group generally licensed to administer and interpret psychological testing, such as assessments for ADHD, learning disorders or personality. In most states they cannot prescribe medication.

The formal definition

A licensed, doctoral-level psychologist authorized to prescribe and has undergone specialized education and training in preparation for prescriptive practice and has passed an examination accepted by the state board of psychology relevant to establishing competence for prescribing, and has received from the state board of psychology a current certificate granting prescriptive authority, which has not been revoked or suspended.

Source: NUCC Health Care Provider Taxonomy code set. This is the definition used for billing and registration, which is why it reads the way it does.