I believe if you look at the local coverage determination policy for Medicare carrier you are billing for the CPT code in question, there will be reference to who can actually perform this service:
For example, describing "within their scope of practice" from WPS Medicare J5. Typically this service is reserved for someone who are specialized in the field of diagnosis/treatment of mental disorders.
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Coverage Indications, Limitations, and/or Medical Necessity
Psychiatry and Psychology are specialized fields for the diagnosis and treatment of various mental health disorders and/or diseases.
References to providers throughout this policy include physicians, and non-physicians, such as clinical psychologists, independent psychologist, nurse practitioners, clinical nurse specialists and physician assistants when the services performed are within the scope of their clinical practice/education and authorized under the state law.