Wiki ASC facility billing getting denial from insurance 45378 with mod-74 diagnosis Z21.11 and Z53.8. Does anyone see error, reason for denial?

shayden

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ACS facility billing 45378 with modifier 74 diagnosis Z21.11 andZ53.8. Does anyone see error or reason for denial?
 
What is the payer and what reason are they giving for the denial? The only thing I can guess without additional information is that if the payer is Medicare or follows Medicare guidelines, then with this diagnosis the procedure should be G0121 instead of 45378.
 
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