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ICD-10-PCS 2027 procedure code

00BA0ZZExcision of Hypothalamus, Open 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 00BA0ZZ

00BA0ZZ is the ICD-10-PCS code for a excision procedure on the hypothalamus using an open approach. In ICD-10-PCS, excision means cutting out or off, without replacement, a portion of a body part.

In plain terms, this corresponds to operations on thalamus, the ICD-9-CM procedure title it maps to (01.41).

For a different body part, codes include 00B00ZZ (brain), 00B10ZZ (cerebral meninges), 00B20ZZ (dura mater), 00B60ZZ (cerebral ventricle), 00B70ZZ (cerebral hemisphere), 00B80ZZ (basal ganglia) and 20 more.

The same procedure with a different approach is coded 00BA3ZZ (percutaneous) and 00BA4ZZ (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 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
BExcision

Cutting out or off, without replacement, a portion of a body part

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

Includes: Partial nephrectomy, liver biopsy

4. Body Part
AHypothalamus

Includes: Mammillary body

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
ZNo Qualifier

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.

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

ICD-9-CM equivalent

Converter →
  • 01.41Operations on thalamusapproximate

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 00BA0ZZ

Is 00BA0ZZ a valid ICD-10-PCS code for 2027?

Yes. 00BA0ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 00BA0ZZ an O.R. procedure?

Yes. 00BA0ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 00BA0ZZ group to?

Depending on the principal diagnosis, 00BA0ZZ 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 00BA0ZZ?

The CMS GEMs map 00BA0ZZ to ICD-9-CM 01.41 (Operations on thalamus).