Removal of Aqueous Shunt

What is the best CPT® code for a removal of Aqueous Shunt? I was looking at either 67121 or 65920

re: Removal of Aqueous Shunt

The Current CPT® book says (under Aqueous Shunt) use 67120 for removal of implanted shunt, posterior segment, extraocular
67120

The physician inserts an ocular speculum. The physician removes a previously implanted extraocular tube, reservoir, buckle, or other prosthetic device from the eye. The physician may close the incision with sutures and may restore the intraocular pressure with an injection of water or saline. A topical antibiotic or pressure patch may be applied.

there is a sub category
67121 Intraocular

An incision is made in the pars plana near the site of an intraocular lens that has fallen into the posterior segment of the eye. The physician removes the extracapsular IOL from the eye. The physician closes the incision with sutures and may restore the intraocular pressure with an injection of vitreous substitute. A topical antibiotic or pressure patch may be applied.