There have been no changes to ICD-9 CM since October 1, 2011; there have been no changes to the ICD-9 CM guidelines since October 1, 2011. There are no changes for 2015 for ICD-9 CM. Therefore the only ICD-9 CM book you need is the 2012 version, all the ones since that time are identical to the 2012. The last update to the ICD-10 CM code set was October 1, 2011. Since that time the October 2012, and 2013, updates for ICD-10 CM have been grammatical and spelling corrections. There are no updates for ICD-10 CM for October 1, 2014, the guidelines for ICD-10 CM have had additions each year since 2011. There is no announcement as of yet for ICD-10 CM guidelines for 2015, that usually comes out closer to August or September.
The next planed full update to the code set is planned for October 1, 2015 and it will be ICD-10 CM only.