Here's some good news for anyone who doesn't want to buy, read,
or use the DSM-5.
The World Health Organizatio (WHO) provides free online ICD-10 access, and free online ICD-10 training. I worked through most of the training, and it's a bit dull, but pretty intuitive.
Fittingly, Mental and Behavioral Disorders are in chapter V.
Here's a peak at how depression is described, ICD-10 style:
ICD-10 codes are very different from ICD-9 codes, which are structured like DSM codes. Will insurance companies accept them? Looks like they will, starting October 1, 2014. Until then, ICD-9 will have to do.