How many doctor opinions with Medi-Cal

I had an Orthopedic surgeon tell my husband he has stage 3 knee arthritis but this Dr was so rude and didn't answer questions, didn't even say bye. He was given an authorization for another Dr but according to the reviews, he's also rude and gives you no time. If he were to try and see this new one and doesn't like him and give him no useful information, can he try another one? Is there a limit on how many he can see with Medi-Cal?