Final answer:
The correct root operation term used in ICD-10-PCS for the application of a free skin graft to the nose post excision of a malignant neoplasm is the transfer (option D). This term describes the procedure where the material is used to take the place and restore the function of a body part.
Step-by-step explanation:
The correct root operation term used in ICD-10-PCS for the application of a free skin graft to the nose following the excision of a malignant neoplasm is a replacement. In the context of ICD-10-PCS, replacement means putting in or on biological or synthetic material that physically takes the place and/or function of all or a portion of a body part. This procedure is performed to restore the function of the nose by covering the defect created after the malignant neoplasm was removed.
The root operation term 'transfer' is used when a body part is moved to a different location without cutting off its blood supply. In this case, a free skin graft is transferred from one location (typically the thigh or buttocks) to the nose after the excision of a malignant neoplasm.