“You had to pay the fee, or the doctor wasn’t going to see you anymore.” That was the takeaway for Terri Marroquin of Midland, Texas, when her longtime physician began charging a membership fee in 2019. She found out about the change when someone at the physician’s front desk pointed to a posted notice. At first, she stuck with the practice; in her area, she said, it is now tough to find a primary care doctor who doesn’t charge an annual membership fee from $350 to $500. But last year, Marroquin finally left to join a practice with no membership fee where she sees a physician assistant rather …