One of our Ophthamology clinics is starting to get front-end edits when billing an EM visit with 92135. In the past, the coder has not put a 25 modifier on the EM visit, but now we are getting a front-end edit stating a 25 modifier 'may' need to be linked to the office visit. We do have a new claims clearinghouse we are using and I'm wondering if it's just a clearninghouse edit issue or if guidelines have changed for billing EM w/ the 92135. Just wondering if anyone who does ophthamology coding has any information on this issue. Thanks.