Which item or service may require service line prior authorization?

The correct answer is hearing aids, as this item often requires prior authorization due to the nature of their usage and the associated costs. Hearing aids can be expensive, and insurance providers typically have specific criteria that must be met to ensure the medical necessity of the device. This may include providing documentation from a healthcare provider verifying the patient's auditory impairment and that a hearing aid is the recommended treatment.

In contrast, the other options typically do not require prior authorization. Contact lenses are generally considered a vision correction option that may fall under standard vision care without the need for pre-approval. Physical therapy sessions may be subject to authorization, but it often depends on the number of sessions and the specific insurance plan; hence, it doesn't apply universally like hearing aids. Routine checkups are usually preventive services that typically do not require authorization, making them accessible without additional pre-approval steps.