Physician Quality Network, (formerly known as St. Luke’s Independent Practice Association (IPA)), is a non-profit corporation organized under the laws of the State of Texas and was officially incorporated in 1992. PQN is a multispecialty network of 700 physicians.

In 2009 PQN implemented a Clinically Integrated model for its physicians. This clinical integration involves the sharing of information and integration of group goals to improve and standardize performance, reduce redundancy and improve patient care outcomes.