John Warren is a highly experienced Medicare veteran with wide ranging experience in traditional Medicare fee-for-service, Medicare program integrity, and Medicare contracting issues.  With over 22 years of experience inside the Centers for Medicare and Medicaid Services (CMS), John brings a unique perspective to clients of all types and sizes.  As the former CMS director of the Divisions responsible for payment policy and program integrity, John is uniquely qualified to speak on matters related to Medicare payment for clinical laboratory services, Part B prescription drugs, and the Medicare physician fee schedule.