If the questioning physician wants advice, he might consult Asrar Ahmed, the author of ERISA and Sharia Law and Can Sharia and ERISA Coexist?.
He is an EBSA Senior Investigator and presumably would not provide advice on a question of U.S. law that could come before the Labor department. But perhaps he might on his own time provide his advice on a question of religious law, which the Labor department would not consider.
One can find him on LinkedIn.