Hospitals negotiate their own reimbursement it’s highly individualized. They get what they negotiate with the insurance plans and usually have a whole army of lawyers to negotiate rates. In my area the hospitals are all big systems and they will threaten to leave the insurance if they don’t get the rates they want which is usually over 1000 for 99205 and over 500 for 99214 to give you an idea. If the hospital is truly experiencing declining reimbursement that should only be relevant to you if you are on an EWYK system which hospitals almost never have. This is probably just a ploy to minimize costs.
ETA they are also legally required to publish the rates they get from insurance by plan so you should be able to look this up