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If 0 or Null, check Level I and II code/modifiers only. If >0, check Level I, II, and III code/modifiers. CDT = date to check modifier status, Fileman format. If 0 or Null, return all the modifiers for a code. Else return only modifiers active on the date of CDT. If CDT is prior to 1/1/1989, 1/1/1989 will be used ................
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