| GXB — Esthesiometer | Class 1 / NE |
| GXC — Device, Electroconvulsive Therapy | Class 3 / NE |
| GXD — Generator, Lesion, Radiofrequency | Class 2 / NE |
| GXE — Leukotome | Class 1 / NE |
| GXH — Device, Surgical, Cryogenic | Class 2 / NE |
| GXI — Probe, Radiofrequency Lesion | Class 2 / NE |
| GXJ — Punch, Skull | Class 1 / NE |
| GXL — Screwdriver, Skullplate | Class 1 / NE |
| GXM — Anvil, Skull Plate | Class 1 / NE |
| GXN — Plate, Cranioplasty, Preformed, Non-Alterable | Class 2 / NE |
| GXO — Strip, Craniosynostosis, Preformed | Class 2 / NE |
| GXP — Methyl Methacrylate For Cranioplasty | Class 2 / NE |
| GXQ — Dura Substitute | Class 2 / NE |
| GXR — Cover, Burr Hole | Class 2 / NE |
| GXS — Monitor, Alpha | Class 2 / NE |
| GXT — Monitor, Lesion Temperature | Class 2 / NE |
| GXW — Echoencephalograph | Class 2 / NE |
| GXX — Block, Test, Ultrasonic Scanner Calibration | Class 1 / NE |
| GXY — Electrode, Cutaneous | Class 2 / NE |
| GXZ — Electrode, Needle | Class 2 / NE |
| GYA — Tester, Electrode/Lead, Electroencephalograph | Class 1 / NE |
| GYB — Media, Electroconductive | Class 2 / NE |
| GYC — Electrode, Cortical | Class 2 / NE |
| GYD — Transducer, Tremor | Class 2 / NE |
| GYE — Encephalogram Telemetry System | Class 2 / NE |
| GYK — Instrument, Shunt System Implantation | Class 1 / NE |
| GYZ — Stimulator, Intracerebral/Subcortical, Implanted | Class 3 / NE |
| GZA — Implanted Cerebellar Stimulator | Class 3 / NE |
| GZB — Stimulator, Spinal-Cord, Implanted (Pain Relief) | Class 2 / NE |
| GZC — Stimulator, Neuromuscular, Implanted | Class 3 / PM |
| GZD — Stimulator, Spinal-Cord, Implanted, For Bladder Evacuation | Class 3 / GU |
| GZE — Implanted Diaphragmatic/Phrenic Nerve Stimulator | Class 3 / AN |
| GZF — Stimulator, Peripheral Nerve, Implanted (Pain Relief) | Class 2 / NE |
| GZI — Stimulator, Neuromuscular, External Functional | Class 2 / NE |
| GZJ — Stimulator, Nerve, Transcutaneous, For Pain Relief | Class 2 / NE |
| GZK — Electrode, Nasopharyngeal | Class 2 / NE |
| GZL — Electrode, Depth | Class 2 / NE |
| GZM — Analyzer, Rigidity | Class 2 / NE |
| GZN — Rheoencephalograph | Class 3 / NE |
| GZO — Device, Galvanic Skin Response Measurement | Class 2 / NE |
| GZP — Stimulator, Mechanical, Evoked Response | Class 2 / NE |
| GZQ — Instrument, Dowel Cutting | Class 2 / NE |
| GZT — Retractor, Self-Retaining, For Neurosurgery | Class 2 / NE |
| GZX — Instrument, Microsurgical | Class 1 / NE |
| HAB — Saw, Powered, And Accessories | Class 1 / SU |
| HAD — Rongeur, Powered | Class 2 / NE |
| HAE — Rongeur, Manual | Class 2 / NE |
| HAM — Apparatus, Electrosurgical | Class 2 / SU |
| HAO — Instrument, Surgical, Non-Powered | Class 1 / NE |
| HAS — Needle, Neurosurgical Suture | Class 1 / NE |