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ICD-10-PCS 2027 procedure code

009640ZDrainage of Cerebral Ventricle with Drainage Device, Percutaneous Endoscopic Approach

✓ Valid for 2027O.R. procedure

Short description: Drainage of Cereb Vent with Drain Dev, Perc Endo Approach

Code unchanged since ICD-10-PCS took effect on October 1, 2015. Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data

About 009640Z

009640Z is the ICD-10-PCS code for a drainage procedure on the cerebral ventricle using a percutaneous endoscopic approach with drainage device. In ICD-10-PCS, drainage means taking or letting out fluids and/or gases from a body part.

In plain terms, this corresponds to insertion or replacement of external ventricular drain [EVD], the ICD-9-CM procedure title it maps to (02.21).

For a different body part, codes include 009040Z (brain), 009140Z (cerebral meninges), 009240Z (dura mater), 009340Z (epidural space, intracranial), 009440Z (subdural space, intracranial), 009540Z (subarachnoid space, intracranial) and 24 more.

The same procedure with a different approach is coded 009600Z (open) and 009630Z (percutaneous).

With a different device, use 00964ZZ (no device).

It is an operating-room procedure in the MS-DRG logic for DRG 023 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator), DRG 024 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC), DRG 025 (Craniotomy and Endovascular Intracranial Procedures with MCC), DRG 026 (Craniotomy and Endovascular Intracranial Procedures with CC), DRG 027 (Craniotomy and Endovascular Intracranial Procedures without CC/MCC) and DRG 820 (Lymphoma and Leukemia with Major O.R. Procedures with MCC), under the surgical categories “Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis”, “Craniotomy and endovascular intracranial procedures”, “Lymphoma and Leukemia with Major O.R. Procedures” and 3 more.

It has been valid since ICD-10-PCS took effect on October 1, 2015.

What each character means

1. Section
0Medical and Surgical
2. Body System
0Central Nervous System and Cranial Nerves
3. Operation
9Drainage

Taking or letting out fluids and/or gases from a body part

The qualifier DIAGNOSTIC is used to identify drainage procedures that are biopsies

Includes: Thoracentesis, incision and drainage

4. Body Part
6Cerebral Ventricle

Includes: Aqueduct of Sylvius; Cerebral aqueduct (Sylvius); Choroid plexus; Ependyma; Foramen of Monro (intraventricular); Fourth ventricle; Interventricular foramen (Monro); Left lateral ventricle; Right lateral ventricle; Third ventricle

5. Approach
4Percutaneous Endoscopic

Entry, by puncture or minor incision, of instrumentation through the skin or mucous membrane and any other body layers necessary to reach and visualize the site of the procedure

6. Device
0Drainage Device

Includes: Cystostomy tube; Foley catheter; Percutaneous nephrostomy catheter; Thoracostomy tube

7. Qualifier
ZNo Qualifier

Other versions of this procedure

Different device

MS-DRG v44.0 grouping

All DRGs →

Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.

MDC 24 · Multiple Significant Trauma · Craniotomy for Multiple Significant Trauma

ICD-9-CM equivalent

Converter →
  • 02.21Insertion or replacement of external ventricular drain [EVD]approximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about 009640Z

Is 009640Z a valid ICD-10-PCS code for 2027?

Yes. 009640Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 009640Z an O.R. procedure?

Yes. 009640Z is an O.R. procedure in MS-DRG v44.0.

What DRG does 009640Z group to?

Depending on the principal diagnosis, 009640Z can group to MS-DRG 023, MS-DRG 024, MS-DRG 025, MS-DRG 026, MS-DRG 027 and MS-DRG 820.

What is the ICD-9 procedure code for 009640Z?

The CMS GEMs map 009640Z to ICD-9-CM 02.21 (Insertion or replacement of external ventricular drain [EVD]).