4A1Measurement and Monitoring, Physiological Systems, Monitoring
- Non-Billable Header
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
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.
| Position | Designation | Value | Meaning |
|---|---|---|---|
| 1 | Section | 4 | Measurement and Monitoring |
| 2 | Body System | A | Physiological Systems |
| 3 | Operation | 1 | Monitoring |
In the ICD-10-PCS Alphabetic Index
These FY 2027 ICD-10-PCS Alphabetic Index entries lead to this code:
To code testing of the intra-operative neurophysiologic monitoring, open the FY 2027 ICD-10-PCS Alphabetic Index at Testing, then the subterms Neurophysiologic monitoring, intra-operative. The index leads to table 4A1, where the approach, device and qualifier values shown in the breakdown above complete the seven-character code 4A1.
