If you've been memorizing ICD-9 codes for the past few years, get ready for a dramatic change when you transition to ICD-10. These International Classification of Diseases (ICD) codes may be easy to remember if you're constantly making the same diagnosis or you're performing the same procedure. ICD-10 will be a major change and will confuse most people who are not ready for ICD-10.
Speaking of ICD-10, here's a nice blog post on ICD-10 Watch that talks about ICD-10 mobile apps.
You can also use this mobile website to access WHO ICD-10 for iPhone: http://www.fitodotnet.com/ICD10/