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ICD-10-PCS 2027 procedure code

4A020N8Measurement of Cardiac Sampling and Pressure, Bilateral, Open Approach

✓ Valid for 2027Non-O.R. procedure

Short description: Measure Cardiac Sampl & Pressure, Bilateral, Open

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 4A020N8

4A020N8 is the ICD-10-PCS code for a measurement procedure on the cardiac using an open approach with sampling and pressure (qualifier: bilateral). 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 combined right and left heart cardiac catheterization, the ICD-9-CM procedure title it maps to (37.23).

The same procedure with a different approach is coded 4A023N8 (percutaneous), 4A027N8 (via natural or artificial opening) and 4A028N8 (via natural or artificial opening endoscopic).

It is a non-O.R. procedure that is part of the MS-DRG logic for DRG 212 (Concomitant Aortic and Mitral Valve Procedures), DRG 216 (Cardiac Valve and Other Major Cardiothoracic Procedures with Cardiac Catheterization with MCC), DRG 217 (Cardiac Valve and Other Major Cardiothoracic Procedures with Cardiac Catheterization with CC), DRG 218 (Cardiac Valve and Other Major Cardiothoracic Procedures with Cardiac Catheterization without CC/MCC), DRG 233 (Coronary Bypass with Cardiac Catheterization or Open Ablation with MCC) and DRG 234 (Coronary Bypass with Cardiac Catheterization or Open Ablation without MCC), under the surgical categories “Concomitant Aortic and Mitral Valve Procedures”, “”, “Cardiac Defibrillator Implant with Cardiac Catheterization” and 1 more.

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
2Cardiac
5. Approach
0Open

Cutting through the skin or mucous membrane and any other body layers necessary to expose the site of the procedure

6. Function / Device
NSampling and Pressure
7. Qualifier
8Bilateral

Other versions of this procedure

MS-DRG v44.0 grouping

All DRGs →

Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.

MDC 05 · Diseases and Disorders of the Circulatory System · Concomitant Aortic and Mitral Valve Procedures

MDC 05 · Diseases and Disorders of the Circulatory System · Cardiac Defibrillator Implant with Cardiac Catheterization

MDC 05 · Diseases and Disorders of the Circulatory System · Circulatory Disorders Except AMI, with Cardiac Catheterization

ICD-9-CM equivalent

Converter →
  • 37.23Combined right and left heart cardiac catheterizationapproximate

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 4A020N8

Is 4A020N8 a valid ICD-10-PCS code for 2027?

Yes. 4A020N8 is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 4A020N8 an O.R. procedure?

No. 4A020N8 is designated non-O.R. in MS-DRG v44.0.

What DRG does 4A020N8 group to?

Depending on the principal diagnosis, 4A020N8 can group to MS-DRG 212, MS-DRG 216, MS-DRG 217, MS-DRG 218, MS-DRG 233 and MS-DRG 234.

What is the ICD-9 procedure code for 4A020N8?

The CMS GEMs map 4A020N8 to ICD-9-CM 37.23 (Combined right and left heart cardiac catheterization).