Executive order 14221 (passed in 2021, [0]) was supposed to provide transparency about what the actual negotiated rates were. The idea was that it would be a lot harder for hospitals to engage in price discrimination when they had to publish what everyone was paying.

The actual effect has been... mixed. IIUC, the hospitals mostly haven't complied with the order, or they're maliciously complying while trying to keep their real rates secret.

[0]: https://www.cms.gov/priorities/key-initiatives/hospital-pric...