Wiki ABN conditon/occurence code usuage

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Hello. I am a CPC-H student and I am sightly confused. In our text book, it states that an ABN is never used with condition code 20 or 21 therefore, occurrence code 32 should never be used on the same bill with either of these codes.
We are then given a situation where a patient is sent for lab testing that is not covered by Medicare. He asks that the bill be submitted for denial because of secondary insurance and signs an ABN.
When asked what condition/occurrence code we should use, the answer was:
condition code 20 with occurrence code 32.
When I asked why, I was told it could be done in this situation. No other explanation.
I am concerned that when I take my test, this could be a problem for me. Does anyone have any other information regarding this??
Thank you,
Stephanie
 
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