Susan Morse
Payers are concerned about the use of encounter data to calculate risk scores and payment.
Medical enrollment increased by about 1.3 million members in 2016, or 3.4 percent, totaling about 39.9 million members.
Figure exceeds the model's five-year hospital savings requirement of $330 million, the study said.
Not all improper payments constitute fraud, rather improper documentation, experts say.
Republican Senator and Committee Chairman Orrin Hatch said the boycott was without precedent.
Vizient survey finds 89.5 percent of hospital executives said protection of patients with pre-existing conditions must be kept.
Aetna executives tried to conceal the reasoning behind their recommendation to withdraw, according to the lawsuit.
CMS is expected to release the advance rate notice for plans on Feb. 2.
Bill would give two-year open-enrollment period for consumers with pre-existing conditions.
The Obama administration had already paid for and scheduled the ads.