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 ModifierAdded Units of Value
1. Normal, healthy patient or patient with mild systemic diseaseP1   Elective
ZB   Emergency
2. Patient with severe systemic diseaseP3   Elective or Emergency2
3. Patient with severe systemic disease that is a constant threat to lifeP4   Elective
ZD   Emergency
4. Moribund patient who is not expected to survive without the operationP5   Elective or
P5 with -ET (Emergency)
Special Circumstances  
Other Hypothermia due to anesthesiaP4 with ICD-9 diagnosis code 995.895
Unusual position/field avoidanceZA1
Extracorporeal circulationZC10

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