The classification system is largely used for the purpose of health recording and data collection, among other uses. International Classification of Diseases (ICD): The World Health Organization (WHO) created this internationally used code. There are three types of universally known medical alphanumeric codes: A medical coder transforms this information into universal medical alphanumeric codes. Medical coding is the process of taking a patient’s health care information like medical procedures, diagnosis, necessary medical equipment, and medical services information from the physician's notes. Learn more about what a medical coder does and whether this career path is right for you. This administrative role is an important one within the in-demand healthcare industry. Healthcare providers and insurance companies use these standardized codes for billing and record-keeping. A medical coder translates details from a patient’s medical documents, such as physician's notes, lab reports, procedures, and diagnoses into universal medical codes to maintain accurate medical records.