glaucoma 7255000 Trabeculectomy 7255400 Insert tube in anterior chamber-assist aqueous humour drainage 7255500 Viscocanulostomy 7255600 Revision of trabeculectomy 7255700 Viscocanalostomy 7256000 Laser trabeculoplasty 7256100 Trabeculotomy 7256200 Goniotomy 7256300 Goniopuncture 7256400 Viscogonioplasty 7258700 Resuturing of trabeculectomy 7259000 Needling of bleb following glaucoma surgery 7259100 Injection of bleb following glaucoma surgery 7259200 Revision of bleb NEC following glaucoma surgery 7259300 Removal of releasable suture following glaucoma surgery 7259400 Laser suture lysis following glaucoma surgery 7256y00 Other operation on trabecular meshwork of eye OS 7256z00 Other operation on trabecular meshwork of eye NOS 7259y00 Other specified operations following glaucoma surgery 7259z00 Operations following glaucoma surgery NOS Abbreviations: OAG, open-angle glaucoma; NEC, not elsewhere classifiable; NOS, not otherwise specified; OS, otherwise specified; OPCS-4, OPCS Classification of Interventions and Procedures version 4.