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ICD-10-PCS 2027 procedure code

00NK4ZZRelease Trigeminal Nerve, Percutaneous Endoscopic Approach

✓ Valid for 2027O.R. procedure

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 00NK4ZZ

00NK4ZZ is the ICD-10-PCS code for a release procedure on the trigeminal nerve using a percutaneous endoscopic approach. In ICD-10-PCS, release means freeing a body part from an abnormal physical constraint by cutting or by the use of force.

In plain terms, this corresponds to decompression of trigeminal nerve root, the ICD-9-CM procedure title it maps to (04.41).

For a different body part, codes include 00N04ZZ (brain), 00N14ZZ (cerebral meninges), 00N24ZZ (dura mater), 00N64ZZ (cerebral ventricle), 00N74ZZ (cerebral hemisphere), 00N84ZZ (basal ganglia) and 20 more.

The same procedure with a different approach is coded 00NK0ZZ (open) and 00NK3ZZ (percutaneous).

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 143 (Other Ear, Nose, Mouth and Throat 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”, “Other Ear, Nose, Mouth and Throat O.R. Procedures” and 2 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
NRelease

Freeing a body part from an abnormal physical constraint by cutting or by the use of force

Some of the restraining tissue may be taken out but none of the body part is taken out

Includes: Adhesiolysis, carpal tunnel release

4. Body Part
KTrigeminal Nerve

Includes: Fifth cranial nerve; Gasserian ganglion; Mandibular nerve; Maxillary nerve; Ophthalmic nerve; Trifacial nerve

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
ZNo Device
7. Qualifier
ZNo Qualifier

Other versions of this procedure

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 →
  • 04.41Decompression of trigeminal nerve rootapproximate

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 00NK4ZZ

Is 00NK4ZZ a valid ICD-10-PCS code for 2027?

Yes. 00NK4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 00NK4ZZ an O.R. procedure?

Yes. 00NK4ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 00NK4ZZ group to?

Depending on the principal diagnosis, 00NK4ZZ can group to MS-DRG 023, MS-DRG 024, MS-DRG 025, MS-DRG 026, MS-DRG 027 and MS-DRG 143.

What is the ICD-9 procedure code for 00NK4ZZ?

The CMS GEMs map 00NK4ZZ to ICD-9-CM 04.41 (Decompression of trigeminal nerve root).