In other words, a medical coder translates the documents in a patient's chart into codes. They then categorize those diagnoses and procedures according to a national classification system, assigning a specific numeric or alphanumeric code to each diagnosis or procedure. Medical coders read a patient’s medical chart and analyze it, determining the patient's diagnoses and any procedures performed. The Andrews School training program prepares coders to the highest level of professional coding credentials so they are eligible to apply for medical coding jobs in any of those medical environments. The duties vary according to the type facility and the level of credentials of the medical coder. So do nursing homes and medical practice billing services. Medical insurance companies hire medical coders. Some work in hospitals, others in clinics and physician offices. Graduates of The Andrews School online training program for medical coders work in many different medical coding situations.