Directly selling to anyone independently is almost impossible if you haven't networked appropriately or have substantially impressive qualifications. Lots of the bigger corporations (in America at least) have a select list of approved consulting groups that they're willing to sign an SOW with. You're not gonna even get in the door if you don't work with one of them. Not as familiar with selling to the government but I'm sure it's similar and probably more hoops to jump(probably get paid a lot less too).

I'd work on formulating your idea more. Early warning systems for a diseases with ML seems like it could mean almost anything. Narrow it down to a specific use cause and a specific methodology. Why is it better than existing methods? What's the value it's going to bring to the government or corporation you sell to? Why should they believe you? How long will it take for you to have a viable product? What are the risks of using your product? (lots of false positives could make your idea more harmful then helpful) What's the performance monitoring plan?

I'd try networking with people that do consulting data integration/analytics in health care industry/medical device industry. Pitch your idea to them, see how they react (people might already be doing what you're thinking). Got to learn the industry, if you're going to be able to sell to them. Good luck!