Question: Nebraska Subscriber Answer: You should only code it once without any modifier. The Physician Fee Schedule Database gives 76514 (Ophthalmic ultrasound, echography, diagnostic; corneal pachymetry, unilateral or bilateral [determination of corneal thickness]) a bilateral surgery indicator of "2," which means "150 percent payment adjustment for bilateral procedure does not apply." Note: By the same token, if you perform the test on only one eye, it is not necessary to append modifier 52 (Reduced services) to the CPT code. Keep in mind that a local Medicare payer may require modifiers LT or RT when billing a bilateral code for one eye only. But that is not typical and you should not append modifier 52 for a service that is defined as either unilateral or bilateral unless a local carrier determination exists and advises you to do so.