As a lot of other posters have noted - hospital level deployments, where good data practices and IT are arguably the most needed due to the mission critical nature and the larger volumes of data generated, is hobbled by entrenched interests, IT policy dominated by insurance revenue concerns rather than driven by patient or practitioner needs, and being swallowed up by a oligopoly (soon to be monopoly) consisting of Cerner, McKesson and Epic.
All of these companies use antiquated databases (MUMPS forms the basis of the products of these companies for the most part, a data language invented in the basement of Massachusetts General that predates FORTRAN and COBOL). The UI/UX design is nonexistent (all of them would crush any of the Daring Fireball interfaces of shame posts).
More ominously - these companies protect their business AND their data formats ferociously. Epic is famous for lock ins - once you pay the $50-100 million contract for them to take over your IT, your data will not interface with any other system again, ever. They are good at generating numbers for Medicare and insurance billing revenue that make hospital CEO's giggle with glee (ignoring user experience and good data practices for the doctors, nurses, and patients on the line - which translates into lousy care administered to patients). Judy Faulkner, the CEO of Epic, is known for having much of the Wisconsin Congressional delegation in that company's back pocket, such that she sits on some congressionally mandated committee for EHR's promoting closed, proprietary systems as a means for "patient privacy" (lolwut).
The system I work in actually has a reasonable setup. Not nearly as sexy as some of the advanced hadoop/linkedin/facebook/netflix setups - it was build on an Oracle back end running MS IIS and ASP. But at least it's on the web and the database isn't creaking along on a system that looks like this: http://thedailywtf.com/comments/A_Case_of_the_MUMPS.aspx?pg=...
Yet swayed by whatever koolaid Epic fed them, they forked over the millions in contract to go 40 years back in time.
I think this industry is so so so ripe for disruption. Focus on the doctor/nurse/patient user experience, make EHR software that does what every facebook/google+/linkedin, heck even blogger user takes for granted, get the adoption rates up, and kill these greedy as sons of bitches at their own game.