Diagnosis codes, such as the ICD-10-CM, are officially called the International Classification of Diseases, 10th Revision, Clinical Modification. These codes describe an individual's disease or medical condition. Physicians determine the patient's diagnosis and document this in the medical record, while trained billers assign the diagnosis code numbers to the physician-documented diagnosis for use on hospital forms such as a superbill, the CMS 1500, and the UB-04.
