AMA maintains a webpage for Proprietary Lab Analyses codes, applications, and other instructions, here.
On August 30, 2017, AMA updated the webpage with a comprehensive listing of all PLA codes approved through August 30. The PDF file is online here.
3 codes were approved effective February 1; 2 codes on May 1, and 12 codes on August 1 (totalling 17). All of these codes entered the CMS crosswalk/gapfill process last month (with CMS preliminary rates to be posted in September.) 6 new codes were just posted, and they will be effective October 1. This brings the total roster of PLA codes to 23 (0001U to 0023U).
Note that the left hand column of the PDF provides the test's proprietary name and corporate sponsor.
The next quarterly deadlines for applications will be January 9, 2017 and April 12, 2017.