And as scomarco said, the HMO and PPO networks are seldom identical even with the same medical system. Also the provider directory and sunfire may not be updated. Call the actual doctor's office/medical practice to see if they accept your client's insurance. It doesn't matter what the provider directory, etc says if the doctor's practice/medical system says they do not accept his insurance. Other threads people have commented on this issue as well so, unfortunately, what you are seeing is not unique.Yes, I understand. But according to the provider directory and Sunfire the doc is showing as in network.