4A100BZ ICD-10-PCS Code: Monitoring of Central Nervous Pressure, Open Approach
Axis Breakdown
Every ICD-10-PCS code is exactly seven characters, one per axis. Each character's meaning is defined by its position in the code.
| Position | Value | Meaning |
|---|---|---|
| 1 | Section4 | Measurement and Monitoring |
| 2 | Body SystemA | Physiological Systems |
| 3 | Root Operation1 | Monitoring Determining the level of a physiological or physical function repetitively over a period of time |
| 4 | Body System0 | Central Nervous |
| 5 | Approach0 | Open |
| 6 | Function / DeviceB | Pressure |
| 7 | QualifierZ | No Qualifier |
Related Codes
Same operation — other Body System
Same table and root operation, differing only in the body system character.
4A160BZ — Monitoring of Lymphatic Pressure, Open Approach
Same operation — other Function / Device
Same table and root operation, differing only in the function / device character.
4A1002Z — Monitoring of Central Nervous Conductivity, Open Approach, 4A1004Z — Monitoring of Central Nervous Electrical Activity, Open Approach
Same procedure category (CCSR), other tables
AHRQ's Clinical Classifications Software Refined groups these ICD-10-PCS procedures with this one under ICP and other CNS monitoring (excluding EEG) (Measurement and Monitoring); listed here are the members in other PCS tables. Source: Clinical Classifications Software Refined (CCSR), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, November 2025.
4A0002Z — Measurement of Central Nervous Conductivity, Open Approach, 4A000BZ — Measurement of Central Nervous Pressure, Open Approach, 4A003BD — Measurement of Intracranial Pressure, Percutaneous Approach, 4A003KD — Measurement of Intracranial Temperature, Percutaneous Approach, 4A003RD — Measurement of Intracranial Saturation, Percutaneous Approach, 4A007BD — Measurement of Intracranial Pressure, Via Natural or Artificial Opening, 4A007KD — Measurement of Intracranial Temperature, Via Natural or Artificial Opening, 4A007RD — Measurement of Intracranial Saturation, Via Natural or Artificial Opening, 4A008BD — Measurement of Intracranial Pressure, Via Natural or Artificial Opening Endoscopic, 4A008KD — Measurement of Intracranial Temperature, Via Natural or Artificial Opening Endoscopic, 4A008RD — Measurement of Intracranial Saturation, Via Natural or Artificial Opening Endoscopic, 4A00X2Z — Measurement of Central Nervous Conductivity, External Approach, 4B00XVZ — Measurement of Central Nervous Stimulator, External Approach, 4B00XW0 — Measurement of Central Nervous Cerebrospinal Fluid Shunt using Wireless Sensor, External Approach, XXE0X07 — Measurement of Intracranial Vascular Activity, Computer-aided Assessment, New Technology Group 7, XXE0X1A — Measurement of Intracranial Cerebrospinal Fluid Flow, Computer-aided Triage and Notification, New Technology Group 10
Contextual Map
Every relationship of 4A100BZ in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.
PCS table
- 4A1[PCS table]— CMS ICD-10-PCS tables
- Measurement and Monitoring — Section: Measurement and Monitoring[Section]: “Measurement and Monitoring”— CMS ICD-10-PCS tables
- Physiological Systems — Body System: Physiological Systems[Body System]: “Physiological Systems”— CMS ICD-10-PCS tables
- Monitoring — Operation: Monitoring[Operation]: “Monitoring”— CMS ICD-10-PCS tables
Clinical classification (CCSR)
- MAM012 — ICP and other CNS monitoring (excluding EEG)[CCSR category]: “ICP and other CNS monitoring (excluding EEG) — Measurement and Monitoring”— AHRQ CCSR for ICD-10-PCS Procedures (HCUP) · v2026.1
Nearest codes
- 4A1002Z — Monitoring of Central Nervous Conductivity, Open Approach[One axis away]— CMS ICD-10-PCS tables
- 4A1004Z — Monitoring of Central Nervous Electrical Activity, Open Approach[One axis away]— CMS ICD-10-PCS tables
- 4A160BZ — Monitoring of Lymphatic Pressure, Open Approach[One axis away]— CMS ICD-10-PCS tables
Change history
No changes recorded for this code. This ledger tracks additions, deletions and description changes from FY2026 (April) onward. Note changes are not tracked.
Read from: CMS ICD-10-PCS code tables, index and definitions — FY2026 (April); CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43; AHRQ HCUP Clinical Classifications Software Refined for ICD-10-PCS Procedures (hcup-us.ahrq.gov/toolssoftware/ccsr/PRCCSR_v2026-1.zip) — v2026.1. All data sources · How to read the labels