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ICD-10-PCS 2027 procedure code

4A09XMZMeasurement of Respiratory Total Activity, 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 4A09XMZ

4A09XMZ is the ICD-10-PCS code for a measurement procedure on the respiratory using an external approach with total activity. 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 nonoperative respiratory measurements, the ICD-9-CM procedure title it maps to (89.38).

The same procedure with a different approach is coded 4A097MZ (via natural or artificial opening) and 4A098MZ (via natural or artificial opening endoscopic).

With a different device, use 4A09X1Z (capacity), 4A09X5Z (flow), 4A09XCZ (rate), 4A09XDZ (resistance) and 4A09XLZ (volume).

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
9Respiratory
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
MTotal Activity
7. Qualifier
ZNo Qualifier

Other versions of this procedure

ICD-9-CM equivalent

Converter →
  • 89.38Other nonoperative respiratory measurementsapproximate

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 4A09XMZ

Is 4A09XMZ a valid ICD-10-PCS code for 2027?

Yes. 4A09XMZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A09XMZ?

The CMS GEMs map 4A09XMZ to ICD-9-CM 89.38 (Other nonoperative respiratory measurements).