Over the last six years, employers and insurers have been working diligently to adapt to the ever-changing landscape under the Affordable Care Act. Meanwhile, the agencies have also issued comprehensive regulations under the Paul Wellstone and Pete Domenici Mental Health Parity and Addiction Equity Act of 2008 (MHPAEA) that have gone largely unnoticed. But the lack of notice may quickly be changing. Recently, we have seen a significant increase in Department of Labor (DOL) investigations and enforcement of the MHPAEA. Employers and insurers would be wise to redouble their compliance efforts in this area.