In the cpt coding system, when there is no code to properly represent the work performed by the provider, the coder must use this code.

The multiple answers for the question above are

a) Not elsewhere classifiable
b) Unlisted procedure
c) Not otherwise specified
d) Miscellaneous code

The answer is b) Unlisted procedure
In the case where there is no Cat. I or Cat III code to describe the procedure, then Unlisted procedure is used

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