health insurance

I need some help understanding my UHC coverage. United healthcare shows online that on July, 20/2023 my claim was processed, and the plan discount was for the exact amount as amount billed however, 10 days early on July, 11 I received a letter from United healthcare, saying I was not covered. Help?

URGENT: Hospital made errors on claim and took too long to provide medical records so insurance denied claim. Insurance saying I have to pay full facility charges! What are my options?

Got a surprise bill for Spravato (esketamine) services because my doctor was in-network for ‘behavioral health’ codes but out-of-network for ‘medical’- what are my options?