CMS has scheduled a meeting of the HOP Advisory Panel (formerly known as the Advisory Panel on Ambulatory Payment Classification (APC) Groups) on August 27-29, 2012. Among other things, the panel will address: whether procedures within an APC group are similar both clinically and in terms of resource use; APC group weights; packaging of hospital outpatient prospective payment system services and costs; and the appropriate supervision level (general, direct, or personal) for individual hospital outpatient therapeutic services. The deadline for submitting presentations and comments is July 27, 2012, and the meeting registration deadline is August 17, 2012.