I do inpatient mental health billing and recently started getting denials from Optum. They give authorization for People's Health advantage plan and at each utilization review the authorization numbers change by 1 number (xxxxx-01, xxxxx-02, xxxxx-03, etc.)
Now when I go to bill a stay, I get denied because I can only put 1 auth number on the claim but that number only covers a partial of the stay.
I have tried putting just the main number and excluding the last 2 numbers behind the dash. I have tried using only the first and using only the last auth number. I don't know what else to do. I'm not very experienced in this type of billing so any advice is appreciated.
