When a main-stream, Harvard economist expresses concern about a entity created by the enormous health care bill (ACA,Obamacare) known as the IPAB, it should evoke more wide spread concern about the wide reaching aspects of the legislation.
Professor Greg Mankiw has written with alarm about what a progressive think tank has proposed regarding the IPAB. See here for his commentary but I believe there is more to worry about than a proposal in regard to the IPAB. Mankiw references a proposal by the Liberal Center for American Progress to allow the IPAB to control the expenditures of private health insurance plans not just those expenditures regarding Medicare and Medicaid.
From what I understand the IPAB already has been given that power by Obamacare.
Dr.Richard Fogoros writing in his blog The Covert Rationing Blog explains how the IPAB was created and what it is authorized to do beginning in 2014. His reading of the statute indicates that this presidential appointed panel already has the legislative authority to limit expenditures by private health insurance companies. His analysis also describes how difficult it will be for Congress to over ride the panel's edicts. See here for his comments.