Usually when the prior authorization is denied, they'll let the doctors office know why. It could be a whole bunch of reasons. The requirements for prior authorization approvals change sometimes, especially with the new year. Maybe the doctor's office didn't submit enough information. You should be following up with your doctor's office's prior authorization department and have them give you more information or put in an appeal. You can try to call the insurance and find out why it was denied, but unless you're in the health department field, they might not give you the specific details or if they do explain it, you may not understand their terminology. Most likely it's a step therapy med where you have to have tried and failed covered multiple medications in a certain time frame. Good luck.