Wiki waterproof liner

In our office, we have the patient pay cash if they are asking for a water proof casting,,,$40.00..
Since the cast would be included if there is a fx charge.
 
What code should be used for a waterproof liner? any suggestions?

we use Q4050 , we do have patients either pay cash, or have them sign form that it may not be covered, we put note in box 19 stating waterproof materials, this is assuming it is not the first cast w/ fx care or global.

I have had commercial payors pay for it .
 
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