ICD-9 coding is numerical way of identifying medical conditions for billing and statistical purposes With regard to Medical conditions.....In medical technology ICD-9 codes stands for International Statistical Classification of diseases and related Health problems. for e.g:-001-139 lists infectious and parasitic diseases 680-709 lists Diseases of the skin and subcutaneous tissue for eg:- 680 carbuncle and furuncle 680.0 Boil face 680.1 Boil neck 680.2 Boil Trunk