4A1Measurement and Monitoring, Physiological Systems, Monitoring

Measurement and Monitoring›Physiological Systems›Monitoring
  • Non-Billable Header
ICD-10-PCS 4A1
CMS Source: FY 2026 ICD-10-PCS dataset. Effective Oct 1, 2025 – Sep 30, 2026.FacebookXLinkedInPrint

4A1 is a non-billable ICD-10-PCS code that heads the group for Measurement and Monitoring, Physiological Systems, Monitoring, so it cannot be submitted on a claim; a more specific seven-character code is required. The root operation Monitoring involves determining the level of a physiological or physical function repetitively over a period of time.

Code Identity

ICD-10-PCS Code
4A1
Billable Status
No — Non-Billable Header
Code Describes
Measurement and Monitoring, Physiological Systems, Monitoring
Short Description
Msrmt & Monitor, Physiological Sys, Monitor

PCS Table Breakdown

Each ICD-10-PCS code is built from seven characters, each an axis of the procedure. Hover or tap the icons for the official CMS definitions.

PositionDesignationValueMeaning
1Section4Measurement and Monitoring
2Body SystemAPhysiological Systems
3Operation1Monitoring

Similar Procedure Codes

Questions About 4A1

Is 4A1 a billable code?

No. 4A1 is an incomplete heading for Measurement and Monitoring, Physiological Systems, Monitoring and cannot be submitted on a claim. A complete seven-character code is required, such as 4A1002Z, 4A1004G, and 4A1004Z.