You have a flow of 'patients' through a system. You also have a flow of information about those 'patients'. Some people need access to (some of) that information (doctors, the patients, their carers) but the information needs to be kept private from others.
Already there's an interesting problem that plays to the strength of many people on HN.
Given that health care spending is so large - about £120bn in the UK[1], about $800bn US[2] - it would seem that big money is available for a good solution to these problems.
There are people doing interesting things in health care IT. But I don't know what a minimum viable product looks like when you're aiming at over 60 million records (UK population) or 300 million records (US population).
[1] (http://www.ukpublicspending.co.uk/uk_health_care_budget_2009...)
[2] (http://www.usfederalbudget.us/health_care_budget_2012_1.html)
I know, it's hard to tell, but given that you are a Hacker News reader and find it interesting (and it got upvoted) I think it hit that.