4A1004ZMonitoring of Central Nervous Electrical Activity, Open Approach

Measurement and Monitoring›Physiological Systems›Monitoring
  • Billable / Specific Code
ICD-10-PCS 4A1004Z
CMS Source: FY 2026 ICD-10-PCS dataset. Effective Oct 1, 2025 – Sep 30, 2026.FacebookXLinkedInPrint

4A1004Z is a billable ICD-10-PCS procedure code for Monitoring of Central Nervous Electrical Activity, Open 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

ICD-10-PCS Code
4A1004Z
Billable Status
Yes — Valid for Submission
Code Describes
Monitoring of Central Nervous Electrical Activity, Open Approach
Parent Code
4A1
Short Description
Monitoring of Central Nervous Electr Activity, Open Approac

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
4BodySystem0Central Nervous
5Approach0Open
6Function/Device4Electrical Activity
7QualifierZNo Qualifier

Convert to ICD-9-PCS

Closest ICD-9-PCS equivalents for 4A1004Z under the General Equivalence Mappings.

89.14
Approximate match.

Similar Procedure Codes

Questions About 4A1004Z

Is 4A1004Z a billable code?

Yes. 4A1004Z is a complete seven-character ICD-10-PCS code, specific enough to report Monitoring of Central Nervous Electrical Activity, Open Approach on inpatient claims from October 1, 2025 through September 30, 2026.

What do the characters in 4A1004Z mean?

4A1004Z 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 0 is the BodySystem (Central Nervous); the 5th character 0 is the Approach (Open); the 6th character 4 is the Function/Device (Electrical Activity); the 7th character Z is the Qualifier (No Qualifier).

What is the ICD-9-PCS equivalent of 4A1004Z?

Under the General Equivalence Mappings, Monitoring of Central Nervous Electrical Activity, Open Approach crosswalks to ICD-9-PCS 89.14. The mapping is approximate, so confirm it fits the documentation.