This is another weird combination of words that most of us can understand, but we would also group the words in a different order to make more sense. Clearly the popular term here would be "temporary medical insurance." I think we can all imagine what this is, even if we've never needed it. If you're between jobs and you do not have medical insurance, you might want to consider something like this. I'm sure the cost per day (if you want to do the math that way) is much higher than regular medical insurance. This is how pretty much anything works. Think about it, if you rent a car you pay more per day than if you lease it. The profit margins for temporary medical insurance is obviously going to be very high, so they are willing to pay a lot for potential customers.
This page of Insurance Medical Temporary information is intended to show you why it is a high paying keyword, so you might be able to understand what you'll need to know to make a website centered around it. Other sites just give you a list, I am just trying to explain why each keyword is on those lists. I do not claim to be a Insurance Medical Temporary expert, and I encourage you to do your own research. The price for each keyword comes from a variety of high paying keyword lists, and I do not guarantee it is accurate at the time of your visit. It is the average price paid to get that keyword listed in the advertisers results. It is not the price that adsense pays per click. That price fluctuates and is against their terms to disclose.