4A123FZMonitoring of Cardiac Rhythm, Percutaneous Approach
- Billable / Specific Code
4A123FZ is a billable ICD-10-PCS procedure code for Monitoring of Cardiac Rhythm, Percutaneous Approach. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). 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 |
| 4 | BodySystem | 2 | Cardiac |
| 5 | Approach | 3 | Percutaneous |
| 6 | Function/Device | F | Rhythm |
| 7 | Qualifier | Z | No Qualifier |
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for 4A123FZ under the General Equivalence Mappings.
Code History
Similar Procedure Codes
Questions About 4A123FZ
Is 4A123FZ a billable code?
Yes. 4A123FZ is a complete seven-character ICD-10-PCS code, specific enough to report Monitoring of Cardiac Rhythm, Percutaneous Approach on inpatient claims from October 1, 2025 through September 30, 2026.
What do the characters in 4A123FZ mean?
4A123FZ breaks down character by character: the 1st character 4 is the Section (Measurement and Monitoring); the 2nd character A is the Body System (Physiological Systems); the 3rd character 1 is the Operation (Monitoring); the 4th character 2 is the BodySystem (Cardiac); the 5th character 3 is the Approach (Percutaneous); the 6th character F is the Function/Device (Rhythm); the 7th character Z is the Qualifier (No Qualifier).
What is the ICD-9-PCS equivalent of 4A123FZ?
Under the General Equivalence Mappings, Monitoring of Cardiac Rhythm, Percutaneous Approach crosswalks to ICD-9-PCS 89.59. The mapping is approximate, so confirm it fits the documentation.
