The month in which you enrolled in Medicare, you ceased being eligible to contribute to your HSA, even if you also had an HDHP (High Deductible Health Plan).
There are certain minor health coverages that don't eliminate your eligibility to contribute to an HSA, but Medicare is not one of them.
Your HSA contribution limit will be limited by the number of months you were on Medicare. If you were on Medicare all year, then all HSA contributions will be considered excess contributions and you will have to withdraw them.
The month in which you enrolled in Medicare, you ceased being eligible to contribute to your HSA, even if you also had an HDHP (High Deductible Health Plan).
There are certain minor health coverages that don't eliminate your eligibility to contribute to an HSA, but Medicare is not one of them.
Your HSA contribution limit will be limited by the number of months you were on Medicare. If you were on Medicare all year, then all HSA contributions will be considered excess contributions and you will have to withdraw them.
The help menus in TurboTax states that there are exemption like dental and vision that is provided by my HDHP, and still qualifies as HSDP, so can I make contribution to my HAS base on these exceptions?
Certain dental and vision plans are permitted coverage that does not *disqualify* you from being eligible to contribute to an HSA. Being covered by Medicare is not permitted insurance and *does* disqualify you. Having dental or vision insurance does *not* cause you to become qualified when you are otherwise disqualified. If you are disqualified for any reason, you are disqualified and nothing can change that.