The description is somehow vague, and it would help if you could provide us with more details of how the app should look like and what functions it should be able to perform. There are tons of apps on how to do the health stuff.
If you want to make an app that would follow the changes in the patient’s insurance plan, then I recommend taking a look at
https://www.lifeinsuranceblog.net/5-mil ... licy-cost/. They have tons of nice articles there that would help you understand how the insurance policy works and what algorithms you could use to represent it in the app.