On and after the effective date of this section, a self-insured employee welfare benefit plan shall not prohibit the insured from selecting any person who is the holder of a certificate or license under Section 3055 of the Business and Professions Code to perform the particular services covered under the terms of the plan, such certificate holder or licensee being expressly authorized by law to perform such services.
This section shall not apply to any plan governed by federal law which expressly preempts state regulation.