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ICD-10-PCS 2027 procedure code

4A09XCZMeasurement of Respiratory Rate, 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 4A09XCZ

4A09XCZ is the ICD-10-PCS code for a measurement procedure on the respiratory using an external approach with rate. 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).

For a different body part, codes include 4A02XCZ (cardiac) and 4A0HXCZ (products of conception, cardiac).

The same procedure with a different approach is coded 4A097CZ (via natural or artificial opening) and 4A098CZ (via natural or artificial opening endoscopic).

With a different device, use 4A09X1Z (capacity), 4A09X5Z (flow), 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
CRate
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 4A09XCZ

Is 4A09XCZ a valid ICD-10-PCS code for 2027?

Yes. 4A09XCZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A09XCZ?

The CMS GEMs map 4A09XCZ to ICD-9-CM 89.38 (Other nonoperative respiratory measurements).