Well, you're unlikely to find "paracetamol" listed in a US fee schedule. But you won't find such a list easily- they are confidentual business. A provider doesn't want one insurer to know another insurer is paying less, and vice versa. Amy Hospital and Bob Insurance agree that a Kidney Gruzzling costs $500. Bob will pay Amy $300 for each one, Amy can bill the patient for another $100, and the other hundred is sacrificed- which Amy is okay with, because Bob's sending her lots of patients, and Kidney Gruzzlings aren't very common.
But Amy has a deal with Charles Insurance as well. Charles is smaller, will send Amy less business, and Amy knows this when she negotiates the contract. So for Charles, a Kidney Gruzzling will be charged at $600. Charles will pay $400, Amy will bill the patient for $150, and the other $50 is written off.
Amy doesn't want Bob and Charles to know what the other one is paying, or they'll team up. Bob and Charles don't want Amy to know what they're paying Debbie Hospital, or Amy will realize she's a chump and getting less than half what they're paying Debbie for Kidney Gruzzling. Amy doesn't want Debbie to know what Amy's deals with Bob and Charles are because then Debbie could undercut Amy's prices and steal her business. And Bob and Charles have the same issue with each other, that each could undercut the others prices and get Amy's business.
Fee schedules are secret because neither provider nor insurer wants any other providers or insurers to know what they're charging and paying.