https://www.unitedhealthcareonline.com/ccmcontent/ProviderII/UHC/en-US/Assets/ProviderStaticFiles/ProviderStaticFilesPdf/Tools%20and%20Resources/Policies%20and%20Protocols/Medical%20Policies/Medical%20Policies/Manipulation_Under_Anesthesia.pdf webcite Empire Blue Cross Blue Shield Medical Policy: Manipulation Under Anesthesia of the Spine and Joints other than the Knee.