Medical diagnostic codes can be found online, notes the U.S. National Library of Medicine. Their website has codes available for viewing free of charge. There is no guarantee that these lists are complete or the most up to date versions, but access to medical diagnostic codes outside of medical offices is limited.
ICD-9 is the term used to refer to the medical diagnostic codes, along with the term CPT, which stands for current procedural terminology. The codes are in process of being changed to a new configuration which will be referred to as ICD-10, according to the ICD-9 site. This change was implemented by the Department of Health and Human Services in 2014 and will affect all diagnostic related codes and terminology going forward.