If you are looking for what guidance the Feds have told states about healthcare in all its threads, this is the place to find it...
As part of the state-federal partnership in administering the Medicaid and CHIP programs, the Centers for Medicare and Medicaid Services (CMS) issues guidance in the form of letters to State Medicaid Directors, letters to State Health Officials (often regarding CHIP policy or financing issues), Informational Bulletins, and Frequently Asked Questions to communicate with states and other stakeholders regarding operational issues related to Medicaid and CHIP. In addition, CMS issues federal regulations that codify statutory provisions and also policies that have been previously outlined in sub-regulatory guidance. The supporting documents are searchable on this page.