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ICD-10-PCS 2027 procedure code

0N964ZZDrainage of Left Temporal Bone, Percutaneous Endoscopic Approach

✓ Valid for 2027O.R. procedure

Short description: Drainage of Left Temporal Bone, 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 0N964ZZ

0N964ZZ is the ICD-10-PCS code for a drainage procedure on the left temporal bone using a percutaneous endoscopic approach. In ICD-10-PCS, drainage means taking or letting out fluids and/or gases from a body part.

In plain terms, this corresponds to incision and drainage of cranial sinus, the ICD-9-CM procedure title it maps to (01.21).

For a different body part, codes include 0N904ZZ (skull), 0N914ZZ (frontal bone), 0N934ZZ (right parietal bone), 0N944ZZ (left parietal bone), 0N954ZZ (right temporal bone), 0N974ZZ (occipital bone) and 16 more.

The same procedure with a different approach is coded 0N960ZZ (open) and 0N963ZZ (percutaneous).

With a different device, use 0N9640Z (drainage 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 955 (Craniotomy for Multiple Significant Trauma), under the surgical categories “Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis”, “Craniotomy and endovascular intracranial procedures” and “Craniotomy for Multiple Significant Trauma”.

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
NHead and Facial Bones
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
6Temporal Bone, Left

Includes: Mastoid process; Petrous part of temporal bone; Tympanic part of temporal bone; Zygomatic process of temporal bone

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

Different device

Different qualifier

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 →
  • 01.21Incision and drainage of cranial sinusapproximate

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 0N964ZZ

Is 0N964ZZ a valid ICD-10-PCS code for 2027?

Yes. 0N964ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0N964ZZ an O.R. procedure?

Yes. 0N964ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0N964ZZ group to?

Depending on the principal diagnosis, 0N964ZZ can group to MS-DRG 023, MS-DRG 024, MS-DRG 025, MS-DRG 026, MS-DRG 027 and MS-DRG 955.

What is the ICD-9 procedure code for 0N964ZZ?

The CMS GEMs map 0N964ZZ to ICD-9-CM 01.21 (Incision and drainage of cranial sinus).