Update: It turned out the doctor wrote his office address for the claim, not the hospital address. If his services are done in his office it is out-of-network, but if it's done in in-network hospital(my case) then it is in network. Aetna representative called them and ask to reprocess the claim with the right address and told me to wait 7-10 business days. I had to call three times and talk to three different people before I got to the one who could help me. Some of them have no idea or had no desire to help. So be persistent!
Yes this exact same thing happened to me, same insurance and hospital. It's been an absolute nightmare but it looks like we finally got it resolved, 7 months later. After 2 appeals were denied, we took it up with the insurance commissioner. Please feel free to DM me!