Understanding the basics of medical billing will make it easier to process claims and do your coding correctly, even if you don’t work in the industry full time or you are new to working in a practice. You will hear two terms over and over. ICD-9 and CPT. These are the two coding systems that are used to process medical billing forms. The first acronym is the one that identifies the type of disease or physical state of the patient being treated. Those are the ICD-9 codes which stands for International Classification of Diseases, 9th Revision, Clinical Modification, or shortened ICD-9-CM, codes) and another that describes the procedures, services or …