On a very general basis, it's always better to look for lifetime health plans. Plans that expire after a while isn't going to do anything more than leave you high and dry with expenses mounting. If you do want to get term plans, then look for one which has the longest renewal age. That is, you should be able to renew it even if you're at an advanced age. Consider that there will be limitations to how much you can claim for a particular problem. If there is a limit for a surgery or treatment, then you need to know how much the limit is. Look for this when you're browsing through your plans. When you're looking at plans, check whether you want to opt for co-pay and how much the percentage of co-pay is. Co-pay is the amount that you will be paying, with the company paying the rest. But remember that if your claim exceeds the limits of insurance, you'll be paying that as well as the co-pay percentage.
Remember that your health insurance plan needs to have a high coverage amount. There's a simple thing that makes your coverage insufficient: inflation. Chances are that while your coverage amount might seem like enough for today, it might not be even a year from now. You need to think in the long term, so get as high a coverage as you possibly can get. You could decide to upgrade later, but that is a questionable move. You might need to undergo several tests once more and any new illnesses would be automatically excluded, making the entire venture pointless.