International Classifier of Diseases, Clinical Modification (ICD-9 CM diagnosis and procedure codes)
If you do not want to rummage through the pages of a paper classifier you can use an electronic one, installed on your mobile phone. Easy search will help you to find the necessary section in seconds. A favorites list allows you to highlight the sections that are frequently used during your work in order to make a search even faster.
This program contains a full version of an International classifier of diseases, Ninth Revision, Clinical Modification (ICD-9 CM, 2011 release).