Just like summer, spring, fall and winter, Medicare open enrollment season is a sure thing. The annual review process runs from November 15-December 31 every year. Seniors interested in the insurance program can visit Medicare.gov for information and assistance. But according to HelathNews.com those who want to find out if they’re eligible should just head to that site. You’ll also be able to research the plans that would be the best fit for you.

Interested in joining Medicare? You have four options to choose from:

• Medicare Part A

This is is hospital insurance. The premium cost is based on the number of quarters you were employed. If you or your spouse worked more than 40 quarters of Medicare-covered employment you will probably not have to pay a monthly premium for this coverage.

• Medicare Part B

This is medical insurance that typically costs around $100 a month if your income is less than $85,000 or $170,000 for a couple. Expect about a 4% increase in costs in 2011 compared to 2010.

• Medicare Part C

This is the Medicare Advantage Plan, similar to an HMO or PPO. It covers both Part A and Part B services and is offered by private insurance companies. These premiums aren’t government-regulated.

• Medicare Part D

This is Medicare Prescription Drug Coverage that is provided by private insurance companies. This can help people reduce their drug costs and is typically added on to Medicare Part A or Part B coverage.

Even if you’re already enrolled in Medicare, you may want to revisit the plans and make sure you’re in the one that is a good fit for you. Just as with any kind of insurance– auto, home, life or health– revisiting your plan can be a good way to cut costs. “This year there are substantial savings available to beneficiaries in Medicare Part D, so it’s important they learn as much as possible about their options to realize these benefits,” said Richard Ashworth, Walgreens vice president of pharmacy operations, in a news release. “Our pharmacists are among the most trusted and accessible sources for help with making an informed plan choice. They can’t make the decision for you, but they can certainly be a resource to help you understand your options. This is another way our pharmacists are helping people stay well in all the communities we serve.” Cheryl Matheis, senior vice president for health strategy at AARP, told HealthNews.com, “It always pays to do the search again, if your plan’s cost is going up, then you really do need to make sure you have the best deal.”Another way to cut costs is to shop around to other pharmacies. You may be able to find your prescriptions available at a lower price elsewhere. Not all drugs cost the same at each location.