Reflecting from my experience.
I'm just relaying my personal experience. My first job was also coding in the hopsitals. I'm a CPC-A. I coded clinicals, outpatients, and emergency room records. My director and supervisor were ushering me towards becoming credentialed with AHIMA, and were wanting me to do so within the first year. They also paid more for being credentialed through AHIMA, and offered no benefits for AAPC members. I thought it was foolishness! I did just as good, as their AHIMA coders!!
As for the websites I gave above, there are online courses (with the exception of HCPro boot camps).
I also found some other interesting things.
www.ritecode.com has an online inpatient program, and AHIMA's distance learning program, has a DRG course. I still doing some more researching, but they might help you pursue your goal. Ciao!!