4A00X2ZMeasurement of Central Nervous Conductivity, External Approach
- Billable / Specific Code
4A00X2Z is a billable ICD-10-PCS procedure code for Measurement of Central Nervous Conductivity, External Approach. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027). The root operation Measurement involves determining the level of a physiological or physical function at a point in time. In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under ICP and other CNS monitoring (excluding EEG).
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 | 0 | Measurement |
| 4 | BodySystem | 0 | Central Nervous |
| 5 | Approach | X | External |
| 6 | Function/Device | 2 | Conductivity |
| 7 | Qualifier | Z | No Qualifier |
In the ICD-10-PCS Alphabetic Index
These FY 2027 ICD-10-PCS Alphabetic Index entries lead to this code:
To code guidance of the EKG catheter placement, open the FY 2027 ICD-10-PCS Alphabetic Index at Guidance, then the subterms catheter placement, EKG. The index leads to table 4A0, where the approach, Function/Device and qualifier values shown in the breakdown above complete the seven-character code 4A00X2Z.
Clinical Classification (CCSR)
AHRQ groups this procedure code into these clinical categories.
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for this code under the General Equivalence Mappings.
Similar Procedure Codes
Questions About 4A00X2Z
Is 4A00X2Z a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Measurement of Central Nervous Conductivity, External Approach on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in 4A00X2Z mean?
The code 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 0 is the Operation (Measurement); the 4th character 0 is the BodySystem (Central Nervous); the 5th character X is the Approach (External); the 6th character 2 is the Function/Device (Conductivity); the 7th character Z is the Qualifier (No Qualifier).
What is the ICD-9-PCS equivalent of 4A00X2Z?
Under the General Equivalence Mappings, Measurement of Central Nervous Conductivity, External Approach crosswalks to ICD-9-PCS 89.15 (Other nonoperative neurologic function tests). The mapping is approximate, so confirm it fits the documentation.
