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ICD-10-PCS 2027 procedure code

00KA0ZZMap 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 00KA0ZZ

00KA0ZZ is the ICD-10-PCS code for a map procedure on the hypothalamus using an open approach. In ICD-10-PCS, map means locating the route of passage of electrical impulses and/or locating functional areas in a body part.

In plain terms, this corresponds to other diagnostic procedures on brain and cerebral meninges, the ICD-9-CM procedure title it maps to (01.18).

For a different body part, codes include 00K00ZZ (brain), 00K70ZZ (cerebral hemisphere), 00K80ZZ (basal ganglia), 00K90ZZ (thalamus), 00KB0ZZ (pons), 00KC0ZZ (cerebellum) and 1 more.

The same procedure with a different approach is coded 00KA3ZZ (percutaneous) and 00KA4ZZ (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
KMap

Locating the route of passage of electrical impulses and/or locating functional areas in a body part

Applicable only to the cardiac conduction mechanism and the central nervous system

Includes: Cardiac mapping, cortical mapping

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

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 →
  • 01.18Other diagnostic procedures on brain and cerebral meningesapproximate

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 00KA0ZZ

Is 00KA0ZZ a valid ICD-10-PCS code for 2027?

Yes. 00KA0ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 00KA0ZZ an O.R. procedure?

Yes. 00KA0ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 00KA0ZZ group to?

Depending on the principal diagnosis, 00KA0ZZ 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 00KA0ZZ?

The CMS GEMs map 00KA0ZZ to ICD-9-CM 01.18 (Other diagnostic procedures on brain and cerebral meninges).