What is Medigap designed to do?

Medigap, or Medicare Supplement Insurance, is specifically designed to help cover the out-of-pocket costs that Medicare does not fully address. This includes deductibles, copayments, and coinsurance, effectively "filling the gap" in coverage that Medicare beneficiaries encounter. Medicare itself provides a range of services, but beneficiaries often face costs that are not covered, leading to potential financial strain. Medigap policies help to alleviate this burden by providing additional coverage to help manage these expenses.

The other options do not accurately represent the purpose of Medigap. For instance, it does not expand beneficiary eligibility for Medicare, as Medigap is only available to those already enrolled in Medicare. Similarly, Medigap does not provide coverage for all Medicare services without limitation, since it supplements Medicare rather than replacing it, and it does not offer coverage specifically for long-term care, which typically involves different types of insurance products altogether. Therefore, the role of Medigap is centered around assisting with the costs that remain after Medicare pays its share, making option C the correct choice.