Patients may have fill-in-the-gap insurance called?

The term "supplemental insurance" refers to additional coverage that helps fill in gaps in a patient's primary insurance plan. This type of insurance often covers costs that the primary plan does not fully cover, such as copayments, deductibles, or certain services that may not be included. Supplemental insurance is essential for patients who want to reduce out-of-pocket expenses and ensure comprehensive coverage for their healthcare needs.

While "secondary insurance" is a term that also describes insurance that pays after the primary policy has paid its share, it is more specifically used when a patient has two insurance plans. The primary insurance pays first, and the secondary insurance may cover remaining costs. However, supplemental insurance is broader in scope and includes plans designed to fill gaps irrespective of whether there is a secondary policy or not.

The remaining options, including the term "primary," do not apply in this context, as they refer to the main insurance plan a patient holds, and "none of these" does not represent any insurance type relevant to the question. Therefore, supplemental insurance is the most accurate answer as it encompasses the concept of filling in the financial gaps created by a primary insurance policy.