As of now, Medicare does not cover the cost of purchasing a Fitbit for its beneficiaries. Traditional Medicare typically covers healthcare services deemed necessary for diagnosis or treatment by doctors or other healthcare professionals. However, it may be possible for private Medicare Advantage plans or certain supplemental plans to offer additional benefits such as fitness trackers as part of their coverage package. It is always recommended to review the individual plan documents or contact the insurance provider directly to determine if there are any specific benefits related to purchasing a Fitbit through Medicare.