I have never really heard it called that but when I taught ICD-9 classes one of the things I always told the attendees was just because the provider assessed a diagnosis doesn't mean you will find it in the book exactly as stated.
ICD-9 has a lot of "other specified" codes, which means the doctor knows what it is and has assigned it but there is no code in the book for that specific condition.
This is the only scenario I am aware of where it may look like different diagnosis was billed than was documented.
Of course I did have a strange situation with one particular insurance carrier where they wouldn't pay for a procedure based on the specific cancer diagnosis, they wanted a more generic one. Which goes completely against ICD-9 coding guidelines but until they change their policy we have to play by their rules.
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