Corp. Code, § 13401

As used in this part:

(a) “Professional services” means any type of professional services that may be lawfully rendered only pursuant to a license, certification, or registration authorized by the Business and Professions Code, the Chiropractic Act, or the Osteopathic Act.

(b) “Professional corporation” means a corporation organized under the General Corporation Law or pursuant to subdivision (b) of Section 13406 that is engaged in rendering professional services in a single profession, except as otherwise authorized in Section 13401.5, pursuant to a certificate of registration issued by the governmental agency regulating the profession as herein provided and that in its practice or business designates itself as a professional or other corporation as may be required by statute. However, any professional corporation or foreign professional corporation rendering professional services by persons duly licensed by the Medical Board of California or any examining committee under the jurisdiction of the board, the Podiatric Medical Board of California, the Osteopathic Medical Board of California, the Dental Board of California, the Dental Hygiene Board of California, the California State Board of Pharmacy, the Veterinary Medical Board, the California Architects Board, the Court Reporters Board of California, the Board of Behavioral Sciences, the Speech-Language Pathology and Audiology and Hearing Aid Dispensers Board, the Board of Registered Nursing, the State Board of Optometry, or the California Board of Occupational Therapy shall not be required to obtain a certificate of registration in order to render those professional services.

(c) “Foreign professional corporation” means a corporation organized under the laws of a state of the United States other than this state that is engaged in a profession of a type for which there is authorization in the Business and Professions Code for the performance of professional services by a foreign professional corporation.

(d) “Licensed person” means any natural person who is duly licensed under the provisions of the Business and Professions Code, the Chiropractic Act, or the Osteopathic Act to render the same professional services as are or will be rendered by the professional corporation or foreign professional corporation of which the person is, or intends to become, an officer, director, shareholder, or employee.

(e) “Disqualified person” means a licensed person who for any reason becomes legally disqualified (temporarily or permanently) to render the professional services that the particular professional corporation or foreign professional corporation of which they are an officer, director, shareholder, or employee is or was rendering.