Question: Florida Subscriber Answer: CPT guidelines state that providers should use 92270 to document a standard test of the retina's electrical potential when exposed to light for best vitelliform maculopathy. Nowadays, an ENG employs the use of goggles. In the past, the ENG used to involve electrodes for which you could charge (+92547, Use of vertical electrodes [List separately in addition to code for primary procedure], x 8). You do not, however, have a code for goggle use.