CMS is holding the second semi-annual meeting of the Advisory Panel on Ambulatory Payment Classification (APC) Groups on August 10 - 12, 2011.  The purpose of the Panel is to advise the HHS Secretary and CMS Administrator concerning the clinical integrity of the hospital outpatient prospective payment system (OPPS) APC groups and their associated weights. The deadline for comments, presentations, and suggested agenda topics is July 15, and the attendance registration deadline is July 27.