I have a coder telling an audiology provider that because the diagnosis on the referral is wrong therefore they cannot bill for the appointment. The referral had the dx code for "risk of hearing loss" and I guess they had Z00.00 listed as one of the dx codes on the referral. Patient was seen and was diagnosed with failed hearing screening. Does the dx listed on the referral make the appointment unbillable? I thought the dx on referrals were informational for the specialist...