If the visit is in-network or an emergency the insurance company will prevent the practice from billing you anything until the denial is fixed. You don’t have

If the visit is in-network or an emergency the insurance company will prevent the practice from billing you anything until the denial is fixed. You don’t have to do anything other than throw the letter away and just wait for them to fix it. If the practice tries to bill you anyway that’s called balance billing, is illegal, and violates their contract with your insurance company and you can call your insurance’s hotline to report them.