When is Mary's Medicare Supplement Open Enrollment period if she turns 65 on September 23, 2021?

Mary's Medicare Supplement Open Enrollment period begins on her 65th birthday and extends for six months. Since she turns 65 on September 23, 2021, her enrollment period starts on that day, September 23, 2021. The six-month window for her Open Enrollment period will conclude on March 31, 2022.

This timeframe is significant because it is designed to allow individuals to enroll in a Medicare Supplement plan without discrimination based on pre-existing conditions. Thus, the correct answer captures this specific enrollment window, which aligns perfectly with Mary's 65th birthday.

Other options reflect incorrect periods, either beginning too early or concluding too late, preventing these choices from accurately representing Mary’s specific enrollment timeline.