re: Do Health IT Hires Need A Clinical Background?
I'd recommend that you look into CPT codes, ICD-9 codes, and ICD-10 codes, and the differences between them. You don't need to be an expert, but it might help if you are conversant and can mention a few codes from memory and what they reference. That might catch the interviewer off-guard just enough to impress them. Typically, the codes are among the very few things that will be standard across different medical facilities, making this the most "portable" suggestion.
I'd also recommend that you look into the workflows and features of some specific medical workflow software, such as Intersystems Cache. See if you can find some walkthroughs or video how-tos for the software. Look for workflow patterns. Naturally, you'll want to be as conversant as possible on your core competencies, but expanding into their realm will help show them that you are willing to grow for them and address their needs.
I would also recommend learning about encryption software and other ways of protecting privacy data, in the name of HIPAA compliance. Especially focus on data protection on tablets and other portable electronics. Most doctors are chomping at the bit to use their iPads at work for convenience, and most IT shops are dreading the additional support. Data security and portable electronics haven't completely intersected yet, so learning more about both will make you more valuable. Patient Record protection and compliance are always popular subjects in Healthcare because they can directly affect the bottom line.