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ICD-10-PCS 2027 procedure code

4A1971ZMonitoring of Respiratory Capacity, Via Natural or Artificial Opening

✓ Valid for 2027

Short description: Monitoring of Respiratory Capacity, Via Opening

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 4A1971Z

4A1971Z is the ICD-10-PCS code for a monitoring procedure on the respiratory using a via natural or artificial opening approach with capacity. In ICD-10-PCS, monitoring means determining the level of a physiological or physical function repetitively over a period of 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 4A19X1Z (external).

With a different device, use 4A1975Z (flow), 4A197CZ (rate), 4A197DZ (resistance) and 4A197LZ (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
1Monitoring

Determining the level of a physiological or physical function repetitively over a period of time

4. Body System
9Respiratory
5. Approach
7Via Natural or Artificial Opening

Entry of instrumentation through a natural or artificial external opening to reach the site of the procedure

6. Function / Device
1Capacity
7. Qualifier
ZNo Qualifier

Other versions of this procedure

Different approach

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 4A1971Z

Is 4A1971Z a valid ICD-10-PCS code for 2027?

Yes. 4A1971Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 4A1971Z?

The CMS GEMs map 4A1971Z to ICD-9-CM 89.37 (Vital capacity determination).