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ICD-10-PCS 2027 procedure code

6A4Z1ZZHypothermia, Multiple

✓ Valid for 2027

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 6A4Z1ZZ

6A4Z1ZZ is the ICD-10-PCS code for a hypothermia procedure on the none using a multiple approach with no qualifier. In ICD-10-PCS, hypothermia means extracorporeal lowering of body temperature.

In plain terms, this corresponds to hypothermia (central) (local), the ICD-9-CM procedure title it maps to (99.81).

The same procedure with a different approach is coded 6A4Z0ZZ (single).

It doesn't appear in the MS-DRG procedure index, so on its own it doesn't change the DRG assignment.

It has been valid since ICD-10-PCS took effect on October 1, 2015.

What each character means

1. Section
6Extracorporeal or Systemic Therapies
2. Body System
APhysiological Systems
3. Operation
4Hypothermia

Extracorporeal lowering of body temperature

4. Body System
ZNone
5. Duration
1Multiple
6. Qualifier
ZNo Qualifier
7. Qualifier
ZNo Qualifier

Other versions of this procedure

Different duration

ICD-9-CM equivalent

Converter →
  • 99.81Hypothermia (central) (local)approximate

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 6A4Z1ZZ

Is 6A4Z1ZZ a valid ICD-10-PCS code for 2027?

Yes. 6A4Z1ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 6A4Z1ZZ?

The CMS GEMs map 6A4Z1ZZ to ICD-9-CM 99.81 (Hypothermia (central) (local)).