1. Procedure and CPT® Code Selection:

The procedure involves a tympanoplasty with a radical mastoidectomy to remove a cholesteatoma in the middle ear. Additionally, the procedure includes ossicular chain reconstruction and grafting to repair the eardrum.

CPT® Code 69646 is appropriate for tympanoplasty with a radical mastoidectomy, including removal of the cholesteatoma and ossicular chain reconstruction. This code accurately describes the combination of tympanoplasty, radical mastoidectomy, and ossicular chain reconstruction, making it the correct choice.

2. Rationale for Excluding Other Options:

Code 69643 describes a tympanoplasty with a simple mastoidectomy, which is not appropriate since a radical mastoidectomy was performed.

Code 69645 covers a tympanoplasty with radical mastoidectomy but does not include ossicular chain reconstruction, which was part of this procedure.

Code 69641 is for a tympanoplasty without mastoidectomy, making it incorrect for this case.

3. AAPC and CPT® Coding Guidelines:

According to AAPC and CPT® guidelines, 69646 is the appropriate code when a tympanoplasty includes a radical mastoidectomy with ossicular chain reconstruction, as documented in this case.

Therefore, the correct answer based on CPT® guidelines is D. 69646.