To determine which modifier applies to your physician’s claim, check out the following list of what Medicare and other payers include in each description:

Class A Finding:Nontraumatic amputation of foot or integral skeletal portion thereof

Class B Findings:Absent posterior tibial pulse
Advanced trophic changes such as (three of the following sub-categories qualify as one class finding): hair growth (decrease or absence), nail changes (thickening), pigmentary changes (discoloration), skin texture (thin, shiny), skin color (rubor or redness)
Absent dorsalis pedis pulse

Class C Findings: Claudication
Temperature changes (e.g., cold feet)
Edema
Paresthesias (abnormal spontaneous sensations in the feet, e.g., numbness, prickling, or tingling)
Burning

For proper use, be sure to place the Q modifiers to indicate class findings before modifiers LT (Left side) and RT (Right side). Additionally, not all carriers will require it but it is a good idea to include detailed documentation about the necessity of the foot care and tie in the use of the Q modifier.