Which of the following is a form of medical identity theft?

The correct selection indicates that both billing for services not rendered and using someone else's insurance to obtain medical services are forms of medical identity theft.

Medical identity theft occurs when an individual's personal health information is used without their permission to obtain medical services, prescriptions, or to engage in health-related fraud. This makes the first part of the correct answer significant; utilizing someone else's insurance to access medical care directly involves impersonating that individual, highlighting a clear violation of their personal medical identity.

Billing for services not rendered also falls within the realm of medical identity theft, as it often involves fraudulently stating that services were provided when they were not. This act can lead to financial loss and damage to the legitimate patient’s medical record, displaying deceptive practices that exploit both the individual and healthcare systems.

The combination of both actions reinforces the understanding that medical identity theft encompasses a range of fraudulent activities that misuse personal health information. Hence, the answer includes both elements of misrepresentation in the medical context.