Wiki Physical Status Modifiers

The descriptions are in the front of the Anesthesia section of the CPT book:

Physical Status Modifiers

P1: A normal healthy person
P2: A patient with mild systemic disease
P3: A patient with severe systemic disease
P4: A patient with severe systemic disease that is a constant threat to life
P5: A moribund patient who is not expected to survive without the operation
P6: A declared brain-dead patient whose organs are being removed for donor purposes


So a P3 is a patient with severe systemic disease. To bill it, you would add the P3 modifier to your selected code.
 
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