If you are looking to access de-identified healthcare data, in Scotland, the NHS data are made available for research through eDRIS

http://www.isdscotland.org/Products-and-Services/EDRIS/

Thanks Corri! This certainly is precisely what I was requesting.

Thomas, you might want to review the Centers for Disease Control and Prevention, Bahavioral Risk Factor and Surveillance System database at  http://www.cdc.gov/brfss/ it represents a database relate to a series of health questions targeting population health studies. Also SEER data which another set captures data related to disease prevalance, incidence and mortality rates by gender, race and ethnic status. I hope this helps.  Michele

How will you compare the data from various sources? Do they match semantically? Perhaps have a look at detailed clinical models. See e.g. www.openCIMI.org

Thanks Michele - will look at that too.

@ William Goossen - I have not looked at comparing yet - currently just wanting data to test my text-mining tool.

Thanks Nicholas! Will do.

The MIT has just released a new version of their anonymised open access Intensive Care database: MIMIC-3. I have worked with version 2, and I can confirm the high quality of the data. Many incredible papers have been produced from MIMIC. The version 3 now contains nearly 60,000 ICU admissions, and the data structure has been simplified. Highly recommended! 

http://mimic.physionet.org/