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ICD-10-PCS 2027 procedure code

4A09X1ZMeasurement of Respiratory Capacity, 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 4A09X1Z

4A09X1Z is the ICD-10-PCS code for a measurement procedure on the respiratory using an external approach with capacity. 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 Vital capacity determination, the ICD-9-CM procedure title it maps to (89.37).

The same procedure with a different approach is coded 4A0971Z (via natural or artificial opening) and 4A0981Z (via natural or artificial opening endoscopic).

With a different device, use 4A09X5Z (flow), 4A09XCZ (rate), 4A09XDZ (resistance), 4A09XLZ (volume) and 4A09XMZ (total activity).

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
1Capacity
7. Qualifier
ZNo Qualifier

Other versions of this procedure

ICD-9-CM equivalent

Converter →
  • 89.37Vital capacity determinationapproximate

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 4A09X1Z

Is 4A09X1Z a valid ICD-10-PCS code for 2027?

Yes. 4A09X1Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A09X1Z?

The CMS GEMs map 4A09X1Z to ICD-9-CM 89.37 (Vital capacity determination).