Inpatient Procedure Code
4A09X5Z
Measurement of Respiratory Flow, External 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 Operation0 | Measurement Determining the level of a physiological or physical function at a point in time |
| 4 | Body System9 | Respiratory |
| 5 | ApproachX | External |
| 6 | Function / Device5 | Flow |
| 7 | QualifierZ | No Qualifier |
Contextual Map
Every relationship of 4A09X5Z 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
- 4A0[PCS table]
- [object Object] — Section: [object Object] [Section]: “[object Object]”
- [object Object] — Body System: [object Object] [Body System]: “[object Object]”
- [object Object] — Operation: [object Object] [Operation]: “[object Object]”
Nearest codes
- 4A0975Z — Measurement of Respiratory Flow, Via Natural or Artificial Opening [One axis away]
- 4A0985Z — Measurement of Respiratory Flow, Via Natural or Artificial Opening Endoscopic [One axis away]
- 4A09X1Z — Measurement of Respiratory Capacity, External Approach [One axis away]
- 4A09XCZ — Measurement of Respiratory Rate, External Approach [One axis away]
- 4A09XDZ — Measurement of Respiratory Resistance, External Approach [One axis away]
- 4A09XLZ — Measurement of Respiratory Volume, External Approach [One axis away]
- 4A09XMZ — Measurement of Respiratory Total Activity, External Approach [One axis away]
Change history
No changes recorded for this code — unchanged since the FY2026 (April) baseline of the change ledger.