To bill pachymetry of the cornea, one should use CPT 76514 (cornealPachymetry of the cornea pachymetry, unilateral or bilateral). This code can only be used to report if the procedure is being performed using an Ultrasound technique. Since CPT 76514 is inherently bilateral it should not be reported with any site modifiers (RT or LT). Also it would be inappropriate to use modifier -50 with it. This service includes the interpretation and report, therefore no professional and technical modifiers (-26 or -TC) should be used.