Anesthesia Modifiers Chart

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.

Physical Status
HCPCS Modifier Added Units of Value
1. Normal, healthy patient or patient with mild systemic disease P1   Elective
ZB   Emergency
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
4. Moribund patient who is not expected to survive without the operation P5   Elective or
P5 with -ET (Emergency)

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

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