Help! OBGYN used annual physical exam medical code

EDITED: I saw an OBGYN earlier this year for a referral for endometriosis testing and birth control. While in the office, she did a breast exam. A week later, my shoulder was hurt and I went to a primary care doctor to get a referral for physical therapy, and they took my blood while I was there. They coded it under an annual physical exam. A few months later, I get a bill for a $150 copay for the primary care provider. Normally, my copay is about $8 for PCP visits. I hadn’t seen another primary care provider that year, so I contested the bill, and Aetna asked the doctor to resubmit the claim. However, I kept getting the same bill over and over again. Finally, tonight, Aetna investigated more and saw that the OBGYN entered my visit as an annual physical exam, instead of a well woman exam or another appropriate gynecological visit code. I called her office and left a message, but am concerned she won’t do anything about this. Aetna said my best bet is to get her to change the code. Does anyone know anything else I can try? I don’t want to pay this bill. I’ve also never had this happen to me before and I’ve seen gynes/doctors for years. This is in Florida.