Medicare denying 66984 with Modifiers 55 and 59

Medicare is denying cataract extraction co manage charges, using procedure code 66984 and modifier 55 and 59. They say this is not medically necessary. What are we doing wrong? These charges began to deny in 2012.

re: Medicare denying 66984 with Modifiers 55 and 59

Do not use mod59. Here copy this into your browser make sure you are using it the right way.
http://www.cms.gov/Outreach-and-Education/Medicare-Learning-Network-MLN/MLNProducts/downloads/GloballSurgery-ICN907166.pdf