Anesthesia Medical Group (AMG) is born out of a merger between Anesthesia Consultants of Nashville and Middle Tennessee Anesthesia.

The single-market group corners much of the Nashville industry, simultaneously serving Centennial Hospital, Saint Thomas Midtown and Saint Thomas West.

In 2012, Denver-based Excellere Partners invests $42 million in AMG and forms PhyMed Healthcare Group. At the time of the transaction, AMG is run by David Whitten, a former PhyCor executive.