Table 1. Summary of the Medicare allowable fees and results for surgery, including mean reduction of glaucoma medications and IOP reduction over the first year after surgery.

Procedure	Goniotomy	Conventional trabeculotomy	Microcatheter-assisted trabeculotomy	Trabeculectomy	AGV	BGI	CPC
CPT code	65820	65850	65850	66170	66179	66179	66711
Total allowable fee for surgery	$3248	$3268	$3268	$3530	$5395	$5395	$2777
Mean reduction of glaucoma medications
1y	0.1	0.2	0.3	1.3	1.1	1	2
Drop savings in 1st year (reduction after surgery)	$18	$35	$53	$248	$195	$213	$355
Imputed cost of surgery	$3230	$3232	$3214	$3281	$5199	$5181	$2421
Mean IOP reduction (mm Hg)
1y	9.2	11.2	14.2	12.2	15.4	14.7	8.5
$/mm Hg reduction
1y	$351	$288	$226	$400	$338	$350	$284

CPT: Current procedural terminology; IOP: Intraocular pressure; AGV: Ahmed glaucoma valve; BGI: Barveldt glaucoma implant; CPC: Cyclophotocoagulation.