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ICD-10-PCS 2027 procedure code

4A0ZXQZMeasurement of Sleep, External Approach

✓ 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 4A0ZXQZ

4A0ZXQZ is the ICD-10-PCS code for a measurement procedure on the none using an external approach with sleep. In ICD-10-PCS, measurement means determining the level of a physiological or physical function at a point in time.

In plain terms, this corresponds to other sleep disorder function tests, the ICD-9-CM procedure title it maps to (89.18).

With a different device, use 4A0ZX6Z (metabolism) and 4A0ZXKZ (temperature).

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
4Measurement and Monitoring
2. Body System
APhysiological Systems
3. Operation
0Measurement

Determining the level of a physiological or physical function at a point in time

4. Body System
ZNone
5. Approach
XExternal

Procedures performed directly on the skin or mucous membrane and procedures performed indirectly by the application of external force through the skin or mucous membrane

6. Function / Device
QSleep
7. Qualifier
ZNo Qualifier

Other versions of this procedure

Different function / device

ICD-9-CM equivalent

Converter →
  • 89.18Other sleep disorder function testsapproximate

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 4A0ZXQZ

Is 4A0ZXQZ a valid ICD-10-PCS code for 2027?

Yes. 4A0ZXQZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A0ZXQZ?

The CMS GEMs map 4A0ZXQZ to ICD-9-CM 89.18 (Other sleep disorder function tests).