Why did I get a different amount owed from the hospital when requesting an itemized bill?

I'm trying to make sense of a hospital bill that looks as if they are charging me more than the difference in the procedure and what insurance covered. I requested an itemized bill after noticing the math on the original bill didn't add up, which seems to have the correct amount as the current balance ($283.15) but when calling the billing department they can't really explain why apart from saying that I owe the higher balance due.

The bills: https://imgur.com/a/uHojGpq

Any advice on navigating this other than just paying the higher amount due?

I noticed on my EoB document that the procedure is also missing one of the codes that is listed below in the same document:

UUBH01 – Based on an agreement with United Healthcare or United Behavioral Health, the provider has accepted a discount for this service. The discount is your savings and is not included in the amount you owe. If you have paid the physician or health care provider more than the amount you owe, please call them for a refund.

Is is possible the hospital messed up with the billing and didn't apply the plan discount? Also this is an in-network provider. Any help would be appreciated!

submitted by /u/bumpyheels
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