This HND piece takes a look at the ubiquitous codes, and gets a little techie, while providing a bit of a historical perspective. As I note in the piece:
With a variety of free QR code reader apps available for camera-equipped smart phones, the technology was widely accepted within a short time. Deployed in this manner, QR Codes became the interface between print and digital media.
As such, there are dozens of health care related applications, ranging from publicizing a particular doctor's office or medical center, to all sorts of patient education.
Read the complete article.