PAMA Section 216 is the massive overhall of the Clinical Laboratory Fee Schedule, passed 24 months ago by Congress. The legislation told CMS to have final rulemaking in place by July 1, 2015. The proposed rulemaking was not released until last fall.
The final version of the implementation was received at the White House Budget Office on April 21, 2016, per "Inside Health Policy" (subscription, here) and Bloomberg News (here). See also McDermott Plus Consulting, here. The executive branch regulatory information site is here.