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ICD-10-PCS 2027 procedure code

0N950ZXDrainage of Right Temporal Bone, Open Approach, Diagnostic

✓ 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 0N950ZX

0N950ZX is the ICD-10-PCS code for a drainage procedure on the right temporal bone using an open approach (qualifier: diagnostic). In ICD-10-PCS, drainage means taking or letting out fluids and/or gases from a body part.

In plain terms, this corresponds to biopsy of skull, the ICD-9-CM procedure title it maps to (01.15).

For a different body part, codes include 0N900ZX (skull), 0N910ZX (frontal bone), 0N930ZX (right parietal bone), 0N940ZX (left parietal bone), 0N960ZX (left temporal bone), 0N970ZX (occipital bone) and 16 more.

The same procedure with a different approach is coded 0N953ZX (percutaneous) and 0N954ZX (percutaneous endoscopic).

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 477 (Biopsies of Musculoskeletal System and Connective Tissue with MCC or Insertion of Antibiotic-eluting Bone Void Filler), under the surgical categories “Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis”, “Craniotomy and endovascular intracranial procedures”, “Biopsies of Musculoskeletal System and Connective Tissue” and 1 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
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
5Temporal Bone, Right
5. Approach
0Open

Cutting through the skin or mucous membrane and any other body layers necessary to expose the site of the procedure

6. Device
ZNo Device
7. Qualifier
XDiagnostic

Other versions of this procedure

Different qualifier

MS-DRG v44.0 grouping

All DRGs →

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

ICD-9-CM equivalent

Converter →
  • 01.15Biopsy of skullapproximate

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 0N950ZX

Is 0N950ZX a valid ICD-10-PCS code for 2027?

Yes. 0N950ZX is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0N950ZX an O.R. procedure?

Yes. 0N950ZX is an O.R. procedure in MS-DRG v44.0.

What DRG does 0N950ZX group to?

Depending on the principal diagnosis, 0N950ZX can group to MS-DRG 023, MS-DRG 024, MS-DRG 025, MS-DRG 026, MS-DRG 027 and MS-DRG 477.

What is the ICD-9 procedure code for 0N950ZX?

The CMS GEMs map 0N950ZX to ICD-9-CM 01.15 (Biopsy of skull).