Creditable coverage means that your current prescription drug plan through your employer, union or another group is just as good as the standard Medicare prescription drug plan. It is especially important to check this year’s notice because some drug plans that were previously considered as good as Medicare’s plan no longer meet that standard. Each year, by Oct. 15, your health plan must let you know whether your coverage is still considered as good as Medicare’s standard coverage. If you find out that your prescription drug plan is no longer creditable, you will need to sign up for a Medicare prescription drug plan to avoid a late enrollment penalty. If your plan is no longer creditable, you get a special enrollment period (SEP) that starts in the month you lose that coverage and lasts for the next two months. Enrolling in Medicare Part D during this time means you won’t face a late enrollment penalty.