Mario performs surgery on a patient to replace a bone.

Detailed Explanation:

Rationale for Correct Answer: This is unbundling , where services that should be billed under a single comprehensive code are split into multiple components to inflate reimbursement.

Analysis of Incorrect Options:

A. Fictitious services – Charging for services not performed.

B. False diagnosis – Fabricating diagnoses to justify billing.

C. Upcoding – Billing for more expensive services than provided.

Key Concept: Health care billing fraud — unbundling .