Even if you've been happy with your Part D prescription-drug plan or Medicare Advantage plan, compare your options for 2017. Thinkstock By Kimberly Lankford, Contributing Editor November 4, 2016 QI signed up for a Medicare Part D prescription-drug plan last year. Do I need to do anything during open enrollment this year?AOpen enrollment for your Medicare Part D or Medicare Advantage plan for 2017 runs from October 15 to December 7. If you've been happy with your plan, you don't have to do anything; you'll automatically be reenrolled in your current plan if it is still available. But it's important to compare your options for 2017. Plans have been boosting premiums, increasing cost-sharing, imposing new hurdles before covering expensive medications, charging extra if you don’t use certain preferred pharmacies, and making other changes that could increase your out-of-pocket costs. Here's what you need to know when picking a plan for 2017. SEE ALSO: 11 Common Medicare Mistakes 1. Don't stay on autopilot. The average monthly premium for Part D is increasing only slightly -- from $32 this year to $34 in 2017 -- but you could still end up paying a lot more in out-of-pocket costs if your plan increases the co-payments for your drugs or drops them from its formulary (list of covered drugs). And there may be some new plan options in your area. Another plan may be a better deal for you now, especially if you have new prescriptions since you last shopped for a policy. Advertisement 2. Find out how much you'll pay for your drugs. Don't just ask if your plan covers your drugs; instead, find out how much you'll pay for your specific medications. Most Part D plans have four or five pricing tiers: The lowest costs are for preferred generic drugs (sometimes $5 or less for a 30-day supply); you pay slightly more for non-preferred generics (maybe $5 to $10 per month); you might need to pay a percentage of the cost for brand-name drugs – such as 20% for preferred brand-name drugs and 35% for non-preferred; and you might pay as much as 30% to 50% of the cost of expensive specialty medications. TAKE OUR QUIZ: Making Sense of Medicare The plan may change its cost-sharing amounts for each tier. More plans are moving from fixed-dollar co-payments to percentage-based coinsurance, and they may move your drugs from one tier to another. Use the Medicare Plan Finder to compare the total costs for each plan in your area, including the premiums plus out-of-pocket costs for your specific drugs and dosages. The tool also shows when in the year you're likely to reach the doughnut hole (the coverage gap in which you have to pay the bulk of your drug costs). See How the Medicare Part D Coverage Gap Will Affect You in 2017 for more information. 3. Find out if you can save money at a preferred pharmacy – and if the rules have changed. Most Part D plans now have preferred pharmacies, where you will pay a much lower share of the costs than you would through other pharmacies. The preferred pharmacies can change from year to year. The AARP MedicareRx Walgreens plan, for example, charges a $0 copay for a 30-day supply of preferred generic drugs at Walgreens or Duane Reade or through the OptumRx mail-order service, but it charges a $15 co-pay at standard pharmacies. Preferred brand-name drugs cost $27 for a 30-day supply through Walgreens and Duane Reade, but $44 through standard pharmacies, or $81 for a 90-day supply through the OptumRx mail-order pharmacy. SEE ALSO: 7 Ways to Save on Prescriptions 4. Shop separately from your spouse. You and your spouse might have very different needs, depending on your prescriptions. Each of you should plug your drugs and dosages into the Medicare Plan Finder to see what each of you would pay under the plans in your area. If you choose different plans, however, see whether you’ll need to use different preferred pharmacies to get the lowest costs. Advertisement 5. Find out if there are hurdles to cross to get your drugs covered. More plans are requiring you to take extra steps before they will cover pricey brand-name or specialty medications. You might need to get preauthorization (your doctor must fill out a form explaining why you need that drug) or use step therapy (you must try a less-expensive drug first before the plan will cover the pricier medication). 6. Ask your doctor about lower-cost drugs. You can save a lot of money by switching to a generic medication, and new generics come on the market every year. If no generic is available, ask your doctor if you can use a "therapeutic alternative," which is another drug that might have a similar result but costs less, has lower cost-sharing or has a generic version. It's best to ask your doctor about drug alternatives before you choose a Part D plan for the year because the plan with the best deal for generics may be different from the plan with the best deal for the brand-name drug. For more information about saving money on prescription drugs, see 7 Ways to Save on Prescriptions. SEE ALSO: 5 Ways to Ease the Pain of Health Care Costs in Retirement 7. Consider whether you want to switch to Medicare Advantage. Medicare Advantage plans provide both medical and drug coverage through a private insurer. Premiums for these policies tend to be a lot lower than premiums if you fill in Medicare's gaps with a Medicare supplement policy and a Part D plan (some Medicare Advantage plans don't charge anything beyond what you pay for Medicare Part B). But you'll generally have a limited network of doctors and hospitals, and you might have more cost-sharing for your medical care. You have from October 15 to December 7 to switch to a Medicare Advantage plan or to change plans for 2017, and you can compare the plans available in your area with the Medicare Plan Finder (click on "Medicare Health Plans" for Medicare Advantage plans). See What Retirees Must Know About Medicare Advantage Plans for more information about the coverage and rules. For more information about choosing a 2017 Part D or Medicare Advantage plan during open enrollment, see Guide to Medicare Open Enrollment for 2017. Got a question? Ask Kim at email@example.com.