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Official Description

Ventriculocisternostomy, third ventricle; stereotactic, neuroendoscopic method

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

A ventriculocisternostomy, specifically a stereotactic neuroendoscopic method for the third ventricle, is a minimally invasive surgical procedure aimed at alleviating conditions related to cerebrospinal fluid (CSF) flow obstruction. This procedure, commonly known as endoscopic third ventriculostomy (ETV), involves the creation of an opening in the floor of the third ventricle to facilitate the drainage of CSF into the cistern, thereby bypassing any blockages that may be present. The technique utilizes advanced neuroendoscopic tools, allowing for precise navigation and visualization of the cerebral structures while minimizing damage to surrounding tissues. The procedure begins with an incision in the scalp, followed by the creation of a burr hole in the skull, which provides access to the ventricular system. The use of a neuroendoscope enables the surgeon to visualize the anatomy of the ventricles and perform necessary interventions, such as fenestration of the third ventricle floor. This approach is particularly beneficial for patients suffering from conditions such as hydrocephalus, where the accumulation of CSF can lead to increased intracranial pressure and associated neurological symptoms. The careful manipulation of instruments and monitoring of intracranial pressures during the procedure are critical to ensure patient safety and the effectiveness of the intervention.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

Ventriculocisternostomy, specifically the stereotactic neuroendoscopic method for the third ventricle, is indicated for the following conditions:

  • Hydrocephalus - A condition characterized by an accumulation of cerebrospinal fluid (CSF) within the ventricles of the brain, leading to increased intracranial pressure.
  • Obstructive Hydrocephalus - A type of hydrocephalus caused by a blockage in the normal flow of CSF, often due to structural abnormalities or lesions.
  • CSF Flow Obstruction - Situations where the natural pathways for CSF drainage are impeded, necessitating surgical intervention to restore normal flow.
  • Post-hemorrhagic Hydrocephalus - Hydrocephalus that develops following a hemorrhage, which can lead to scarring and obstruction of CSF pathways.

2. Procedure

The procedure for a stereotactic neuroendoscopic third ventriculostomy involves several critical steps:

  • Step 1: Scalp Incision and Burr Hole Creation - The procedure begins with an incision made in the scalp, followed by the creation of a skin flap that is retracted to expose the underlying skull. A single burr hole is then created using a perforator, providing access to the cranial cavity.
  • Step 2: Dura Perforation - Once the burr hole is established, the dura mater, which is the protective covering of the brain, is perforated using pinhole cautery. This step is crucial for accessing the ventricular system.
  • Step 3: Introduction of Neuroendoscope and Catheter - A neuroendoscope and a ventricular catheter system are introduced into the frontal horn of the lateral ventricle. The neuroendoscope allows for visualization of the ventricular anatomy.
  • Step 4: Measurement of Intracranial Pressures - After the neuroendoscope is removed, intracranial pressures are measured to assess the baseline pressure before proceeding with the intervention.
  • Step 5: Visualization and Advancement - The neuroendoscope is reinserted to visualize the foramen of Monro, and the ventricular catheter is advanced into the third ventricle, ensuring proper placement.
  • Step 6: Identification of Basilar Artery - The basilar artery is identified during the procedure, and care is taken to avoid puncturing it while opening the floor of the third ventricle.
  • Step 7: Fenestration of the Third Ventricle - The floor of the third ventricle is fenestrated using the neuroendoscope, allowing for the creation of an opening that facilitates CSF drainage into the subarachnoid space (cistern).
  • Step 8: Verification of CSF Flow - The opening in the floor of the third ventricle is enlarged using the ventricular catheter, and the flow of CSF is verified by observing CSF pulsation. This step confirms the success of the procedure.
  • Step 9: Additional Interventions if Necessary - If good CSF flow is not evidenced, a second opening may be created, or the prepontine cistern may be explored. Any obstructing arachnoid bands or an imperforate Liliequist's membrane may be disrupted using the ventricular catheter for gentle dissection.
  • Step 10: Closing Intracranial Pressures - After confirming good communication between the ventricles and the cistern, closing intracranial pressures are obtained. If these pressures are elevated, an external ventricular drain may be placed to manage the CSF flow.

3. Post-Procedure

Post-procedure care following a stereotactic neuroendoscopic third ventriculostomy includes monitoring the patient for any signs of complications, such as infection or bleeding. Patients are typically observed for changes in neurological status and intracranial pressure. The effectiveness of the procedure is assessed through imaging studies and clinical evaluation to ensure that CSF flow is adequately restored. If an external ventricular drain has been placed, it will be monitored and managed according to established protocols. Patients may require follow-up appointments to evaluate the long-term success of the procedure and to address any ongoing symptoms or concerns.

Short Descr BRAIN CAVITY SHUNT W/SCOPE
Medium Descr VENTRICULOCISTERNOSTOMY 3RD VNTRC NEURONDSC
Long Descr Ventriculocisternostomy, third ventricle; stereotactic, neuroendoscopic method
Status Code Active Code
Global Days 090 - Major Surgery
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 1 - Statutory payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Inpatient Procedures, not paid under OPPS
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P1G - Major procedure - Other
MUE 1
CCS Clinical Classification 2 - Insertion, replacement, or removal of extracranial ventricular shunt
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
52 Reduced services: under certain circumstances a service or procedure is partially reduced or eliminated at the discretion of the physician or other qualified health care professional. under these circumstances the service provided can be identified by its usual procedure number and the addition of modifier 52, signifying that the service is reduced. this provides a means of reporting reduced services without disturbing the identification of the basic service. note: for hospital outpatient reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well-being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
53 Discontinued procedure: under certain circumstances, the physician or other qualified health care professional may elect to terminate a surgical or diagnostic procedure. due to extenuating circumstances or those that threaten the well being of the patient, it may be necessary to indicate that a surgical or diagnostic procedure was started but discontinued. this circumstance may be reported by adding modifier 53 to the code reported by the individual for the discontinued procedure. note: this modifier is not used to report the elective cancellation of a procedure prior to the patient's anesthesia induction and/or surgical preparation in the operating suite. for outpatient hospital/ambulatory surgery center (asc) reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
GC This service has been performed in part by a resident under the direction of a teaching physician
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
Date
Action
Notes
2003-01-01 Changed Code description changed.
1990-01-01 Added First appearance in code book in 1990.
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