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MA plan members can disenroll from their Medicare Advantage (MA) plan during the Open Enrollment Period (OEP) and return to original Medicare. This option is particularly beneficial for individuals who find that the MA plan does not meet their healthcare needs or preferences, allowing them to revert to the traditional Medicare program, which provides coverage for hospital and medical services.

During the OEP, which typically occurs from January 1 to March 31 each year, members have the opportunity to assess their current plan's performance and make a change if necessary. Returning to original Medicare is a crucial option for members who need flexibility in their healthcare choices or who wish to access services that their MA plan may not cover.

The other responses do not accurately reflect the actions available to MA plan members during this specific enrollment period. Members do not have the ability to enroll in any Medicare plan or change their Part B plan only during OEP, and extending their current plan for another year is not an option available during this time frame. The focus of the OEP is primarily on the ability to disenroll from MA plans and switch back to original Medicare.