4A100BZMonitoring of Central Nervous Pressure, Open Approach
- Billable / Specific Code
4A100BZ is a billable ICD-10-PCS procedure code for Monitoring of Central Nervous Pressure, Open Approach. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027). The root operation Monitoring involves determining the level of a physiological or physical function repetitively over a period of 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 | 1 | Monitoring |
| 4 | BodySystem | 0 | Central Nervous |
| 5 | Approach | 0 | Open |
| 6 | Function/Device | B | Pressure |
| 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 monitoring of the pressure central nervous, open the FY 2027 ICD-10-PCS Alphabetic Index at Monitoring, then the subterms Central Nervous, Pressure. The entry lists 4A100BZ directly as a complete, billable code.
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 4A100BZ
Is 4A100BZ a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Monitoring of Central Nervous Pressure, Open Approach on inpatient claims from October 1, 2026 through September 30, 2027.
What is the ICD-10-PCS code for monitoring of the pressure central nervous?
The FY 2027 ICD-10-PCS Alphabetic Index entry Monitoring, Central Nervous, Pressure is a direct entry for 4A100BZ, Monitoring of Central Nervous Pressure, Open Approach, billable on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in 4A100BZ 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 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 B is the Function/Device (Pressure); the 7th character Z is the Qualifier (No Qualifier).
What is the ICD-9-PCS equivalent of 4A100BZ?
Under the General Equivalence Mappings, Monitoring of Central Nervous Pressure, Open Approach crosswalks to ICD-9-PCS 89.15 (Other nonoperative neurologic function tests). The mapping is approximate, so confirm it fits the documentation.
