Most pharmacies, including both independent and chain pharmacies, are participating in Part D, but not necessarily with all plans. You must use a pharmacy that is included in your plan’s network to fill your prescriptions. Plans are required to provide pharmacies within a reasonable distance from your home, but those who live in rural areas may find themselves traveling considerable distances to reach the pharmacy of a particular plan. If the choice of pharmacies is important to you, or particularly if transportation is an issue, you should make sure to pick a plan that will allow you to use the pharmacies you prefer. If you regularly spend part of the year in another state, you should consider enrolling in a national drug plan that includes pharmacies across the nation. Many plans also offer mail order services.