Anesthesia Modifiers Chart
The chart below lists the ASA ranking of patient physical status and the modifiers and added unit values associated with the rankings. It also shows three special circumstance modifiers and their added units of value.
| Patient Physical Status |
HCPCS Modifier | Added Units of Value | |||||
| 1. Normal, healthy patient or patient with mild systemic disease | P1 Elective ZB Emergency |
0 1 |
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| 2. Patient with severe systemic disease | P3 Elective or Emergency | 2 | |||||
| 3. Patient with severe systemic disease that is a constant threat to life | P4 Elective ZD Emergency |
2 3 |
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| 4. Moribund patient who is not expected to survive without the operation | P5 Elective or P5 with -ET (Emergency) |
4 5 |
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| Special Circumstances | |||||||
| Other Hypothermia due to anesthesia | P4 with ICD-9 diagnosis code 995.89 | 5 | |||||
| Unusual position/field avoidance | ZA | 1 | |||||
| Extracorporeal circulation | ZC | 10 | |||||
