Similar to Part B, eligible individuals who do not enroll in Part D at the first opportunity will face a late enrollment penalty when they do join. The late enrollee penalty is 1% for every month of delayed enrollment. They may avoid the penalty if they maintain "creditable" prescription drug coverage outside Medicare (through an employer's retiree plan, for example). If an individual loses creditable coverage, a special enrollment period commences during which the person may join Part D without being subject to the late penalty.
Note: Gap plans H-I-J will no longer be creditable 1-1-2006.
Note:Creditable coverage in this context is different from the HIPAA definition