The international classification of diseases coding system, 10th revision, which describes the numerical coding system used by doctors and clinics to describe every condition evaluated or treated, including health. The current system is known as ICD-9 and the ICD10 colds are scheduled to go intone effect, October 2015, after several postponements.all diagnoses require an ICD code in order to describe them. There are very specific ICD codes and some that are more general, although choosingThe proper code can be quite complicated. The proper code is ultimately important for insurance reimbursement or proper claim evaluation.