Physiological Devices (4B) ICD-10-PCS
The 4B body system covers Measurement and Monitoring procedures on physiological devices, with 16 ICD-10-PCS codes across 1 root operations, 14 of them billable in fiscal year 2026. Each root operation defines a distinct procedural objective, and the info icons show the official definition with a preview of the codes inside.
Root Operations in This Body System 1 operations · 16 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| 4B0 | MeasurementDetermining the level of a physiological or physical function at a point in time | 16 | 14 |
The info icon shows the official root operation definition and previews the codes in that range.
About the 4B Body System
The ICD-10-PCS root operation Physiological Devices (character 4B) involves the use of devices to measure or monitor physiological functions. This operation belongs to the Measurement and Monitoring classification and focuses on determining the status of bodily functions.
Specifically, the code 4B0 represents the procedure of Measurement, which means assessing a physiological or physical function at a particular point in time. This could include evaluating vital signs or other body system activities without interfering with their underlying structure. Accurately coding the ICD-10-PCS Physiological Devices operation ensures proper documentation of procedures that gather important clinical data through monitoring equipment or measurements, essential for patient care management.
Questions About This Page
How many codes are in the 4B body system?
The 4B body system contains 16 ICD-10-PCS codes in FY 2026, organized into 1 root operations. 14 of them are billable on inpatient claims.
What is a root operation?
The root operation is the third character of every ICD-10-PCS code and names the objective of the procedure. Drainage takes fluid out, Excision cuts out a portion of a body part, and Resection removes all of one. Picking the right root operation is the central skill of PCS coding, so each one above carries its official CMS definition.
Related References
Source: CMS FY 2026 ICD-10-PCS order file and code tables, effective October 1, 2025 through September 30, 2026.
