Wiki modifier needed for 73564?

LauraNewYork

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A commercial insurer is denying payment for 73564 (xray knee, 4 view) that was billed with dx code of right knee pain (M25.561) saying that a modifier is required. I'm at a loss. What modifier might they want?
 
If you didn't bill it with a laterality modifier (RT/LT/50), that is most likely what they are asking for. If you did bill it with a laterality modifier already, then perhaps review to see if there were other x-rays it could bundle to or if a 26/TC is appropriate.
 
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