Eye codes/EM Codes

I understand that eye codes are used and sometimes identified by some payors as a yearly routine code, but if a patient comes in for yearly CE with concerns of dry eye, the doc uses an eye code. is it wrong to use an eye code if the pt diagnosis turns to dry eye or an additional medical dx that patient warranted at tos during the exam that was scheduled as a yearly complete eye exam? im a little confused.

* This article was originally published here