Well, .io domains have become quite trendy amongst tech startups.
Your domain name is a generic name, and the question is whether you can sell a company on the benefits of a generic domain.
See if you can identify some target companies, then send them an e-mail and see if you get any interest. That will tell you value.
If you want my honest opinion, I don't think it will be that easy to sell because its generic nature means it's non-distinctive. That said, a company may still be interested because it is a simple and straightforward domain to remember for a health tech purpose. The response you get from companies will give you an idea of value.