| Section | 0 | Medical and Surgical |
| Body System | 0 | Central Nervous System |
| Operation | 9 | Drainage: Taking or letting out fluids and/or gases from a body part |
| Body Part 0 Brain 1 Cerebral Meninges 2 Dura Mater 3 Epidural Space 4 Subdural Space 5 Subarachnoid Space 6 Cerebral Ventricle 7 Cerebral Hemisphere 8 Basal Ganglia 9 Thalamus A Hypothalamus B Pons C Cerebellum D Medulla Oblongata F Olfactory Nerve G Optic Nerve H Oculomotor Nerve J Trochlear Nerve K Trigeminal Nerve L Abducens Nerve M Facial Nerve N Acoustic Nerve P Glossopharyngeal Nerve Q Vagus Nerve R Accessory Nerve S Hypoglossal Nerve T Spinal Meninges U Spinal Canal W Cervical Spinal Cord X Thoracic Spinal Cord Y Lumbar Spinal Cord |
Approach 0 Open 3 Percutaneous 4 Percutaneous Endoscopic |
Device 0 Drainage Device |
Qualifier Z No Qualifier |
| Body Part 0 Brain 1 Cerebral Meninges 2 Dura Mater 3 Epidural Space 4 Subdural Space 5 Subarachnoid Space 6 Cerebral Ventricle 7 Cerebral Hemisphere 8 Basal Ganglia 9 Thalamus A Hypothalamus B Pons C Cerebellum D Medulla Oblongata F Olfactory Nerve G Optic Nerve H Oculomotor Nerve J Trochlear Nerve K Trigeminal Nerve L Abducens Nerve M Facial Nerve N Acoustic Nerve P Glossopharyngeal Nerve Q Vagus Nerve R Accessory Nerve S Hypoglossal Nerve T Spinal Meninges U Spinal Canal W Cervical Spinal Cord X Thoracic Spinal Cord Y Lumbar Spinal Cord |
Approach 0 Open 3 Percutaneous 4 Percutaneous Endoscopic |
Device Z No Device |
Qualifier X Diagnostic Z No Qualifier |