If I only focus on monthly premium, what am I missing about Medicare?

A low premium can feel like a win, but it does not tell the whole story. Medicare costs come in several forms, and the premium is often the smallest part for people who actually use their coverage.Deductibles are what you pay before coverage kicks in. Copays and coinsurance are what you pay each time you get care or fill a prescription. An out-of-pocket maximum, which is the most you would pay in a year under a Medicare Advantage plan, caps your exposure but varies a lot by plan. A plan with a $0 premium and a high out-of-pocket maximum can cost you far more than a plan with a moderate premium and better cost-sharing.Drug coverage is another area people underestimate. Part D plans and Medicare Advantage plans each have their own formularies, meaning the lists of drugs they cover at different cost tiers. If your medications are on a high cost tier or not covered at all, you can end up paying hundreds or thousands more per year regardless of what your premium looks like.Network matters too. Some plans restrict which doctors and hospitals you can see at the in-network rate. Seeing an out-of-network provider can be expensive or simply not covered depending on the plan type. Always verify current plan details since costs and coverage change annually.