Collections agencies need to provide you with an itemized list of what you owe and to who.
If a hospital gives out this information, especially if they didn’t even try to collect it themselves, they have violated HIPPA.
Will a collections agency give you a document proving they vioated HIPPA? No. Do you owe debts on something w/o receipts? No.
Is this a “just trust me bro”, or do you have a reputable source to back up what you’re saying?