You can find information in the FY 2015 IPPS/LTCH Final Rule (79 FR 50146) where CMS reminded hospitals of their obligation to comply with the transparency requirement under the Affordable Care Act.
As a result of the Affordable Care Act, section 2718(e) of the Public Health Service Act requires that ‘‘[e]ach hospital operating within the United States shall for each year establish (and update) and make public (in accordance with guidelines developed by the Secretary) a list of the hospital’s standard charges for items and services provided by the hospital, including for diagnosis-related groups established under section 1886(d)(4) of the Social Security Act.’’
CMS’s guidelines for implementation required that hospitals either make public a list of their standard charges (whether that be the chargemaster itself or in another form of their choice), or have a policy for allowing the public to view a list of those charges in response to an inquiry.
In the 2019 IPPS/LTCH Final Rule, CMS finalized their proposed update to the guidelines that effective January 1, 2019 hospitals will be required “to make available a list of their current standard charges via the Internet in a machine readable format and to update this information at least annually, or more often as appropriate.”
CMS has recently released some Frequently Asked Questions on the topic.
There is also information on price transparency available from the American Hospital Association (AHA Toolkit for Achieving Price Transparency) and many local state hospital associations.