Md. Code, Health Occupations § 15–102

(a) A physician assistant may not practice within the scope of practice of any of the following health occupations authorized under this article:

(1) Nursing;

(2) Optometry;

(3) Physical therapy; or

(4) Psychology.

(b) This title does not limit the right of an individual to practice a health occupation that the individual is authorized to practice under this article.