Physiological Systems and Anatomical Regions (3E) ICD-10-PCS
The 3E body system covers Administration procedures on physiological systems and anatomical regions, with 2,289 ICD-10-PCS codes across 2 root operations, 2,285 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 2 operations · 2,289 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| 3E0 | IntroductionPutting in or on a therapeutic, diagnostic, nutritional, physiological or prophylactic substance except blood or blood products | 2,125 | 2,123 |
| 3E1 | IrrigationPutting in or on a cleansing substance | 164 | 162 |
The info icon shows the official root operation definition and previews the codes in that range.
About the 3E Body System
The ICD-10-PCS root operation in the Administration classification within the Physiological Systems and Anatomical Regions section involves procedures that introduce substances into or onto the body for therapeutic or diagnostic purposes. Two main operations are distinguished: Introduction and Irrigation.
Introduction refers to putting in or on substances such as therapeutic, diagnostic, nutritional, physiological, or prophylactic agents, excluding blood and blood products. This operation encompasses a broad range of treatments where substances are delivered to support or alter physiological functions. In contrast, Irrigation pertains specifically to putting in or on a cleansing substance intended to wash out or clean a body area or system.
Examples include codes like 3E0 for Introduction of these substances and 3E1 for Irrigation using cleansing agents. Understanding and applying these codes accurately is crucial for documenting the administration of various substances within physiological or anatomical contexts.
Questions About This Page
How many codes are in the 3E body system?
The 3E body system contains 2,289 ICD-10-PCS codes in FY 2026, organized into 2 root operations. 2,285 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.
