iPhone app for managing appointments, callbacks, etc

I'm looking for an app (if it even exists) that will allow me to manage a list of medical patients. In this app, ideally, I'd like to be able to enter an initial contact date as well as dates of followup appointments and phone calls and I'd like this app to have native calendar integration.

I've checked out Evernote, but not quite sure that this is the app I'm looking for as it lacks native calendar integration.

Anyone have any ideas of an app like this? Also, if it had a desktop version with syncing capabilities that would be wonderful too. Thank you very much!

You want a CRM program (Customer Relations Manager, just pretend its a Patient Relations Manager).

Google CRM iphone and I'm sure you'll find a few good options.