Medicare & Medicaid
The petition asks the Court to review the case before the end of the current term in June.
Insurers were allegedly found to be exaggerating the health ailments of patients, receiving billions.
The speed of its implementation is one of the key differences between the two senators' healthcare plans, which remain controversial with voters.
Former President Barack Obama's signature health legislation was passed into law on Dec. 24, 2009, marking a fundamental shift in American healthcare.
CMS gave consumers two extra days to sign up, as not all of the half a million people who wanted to enroll were able to do so by December 15.
Rule would pertain to 18 states that have health plans that offer coverage of non-Hyde abortion services.
In contrast, taxpayers would face additional costs if manufacturer rebates were directly applied to insurers' pharmacy prices.
"California will move swiftly to challenge this decision," says California Attorney General Xavier Becerra.
Yang's proposal eschews Medicare For All in favor of a plan that focuses more on lowering costs and expanding coverage.
Drug companies have said they are hamstrung by the current pharmacy benefit manager system, says HHS Secretary Alex Azar.