Medicare.gov - 3 ways to avoid the Part D late enrollment penalty
You have got to get that verification of creditable coverage either from the employer or the actual prescription drug plan which you were on under the employer health insurance.
This is what you should have been getting each year while under the employer prescription drug plan.
Medicare.gov - Notice of Creditable Coverage
Perhaps contact the actual plan provider for a statement that you were covered for prescription drug coverage - Medicare will have to determine if that is enough for creditable coverage.
From a recent conversation on this subject on Reddit/Medicare: Part D penalty
Under the Medicare Modernization Act, employers are required to provide a “creditable drug coverage letter” to anyone enrolled in the company’s group plan that is over age 65. The problem in that there is no monetary penalty if the employers don’t comply, so many do not.
Once you have the “creditable drug coverage letter or letters”. You will need to google “Medicare Part D Appeals” and find the private vendor that handles these. You will fill out an appeal form, send them copies of the letters and they should be able to reduce or eliminate the Part D Late Enrollment Penalty based on the number of month that can be documented with the “creditable drug coverage” letters from the form employer or employers.
Medicare.gov If you disagree with your late enrollment penalty
You should have gotten the form with the letter of notification.
Are you working with a Medicare insurance broker or agent for your new part D plan? If so, they may be able to help you get the info needed to file the appeal.
OR just keep calling the employers health plan for the documentation which you need to offset this Part D penalty (hopefully, it was creditable coverage)
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