Final answer:
A client can enroll in a Medigap plan during the Guaranteed Issue window anytime within six months of turning 65 and being enrolled in Medicare Part B. This period is crucial as it allows individuals to obtain Medigap insurance without health underwriting.
Step-by-step explanation:
The correct answer to when a client can enroll in a Medigap plan during the Guaranteed Issue window is D) Anytime within six months of turning 65. The Guaranteed Issue window is a period that allows individuals to enroll in a Medigap policy without health underwriting. This enrollment period begins on the first day of the month in which an individual turns 65 and is enrolled in Medicare Part B and lasts for six months. It is important for those approaching the age of 65 to be aware of this time-sensitive opportunity, as it is a one-time chance to get Medigap coverage regardless of health status. Medicare is a significant aspect of healthcare for the elderly, with about 40 million people covered under this government program. As individuals transition into the senior category of society, they must learn how to navigate Medicare and the supplementary options available, such as Medigap, to ensure they have comprehensive health coverage.