What is Medical Coding? (opens in new window)According to the AAPC, "Medical coding professionals provide a key step in the medical billing process. Every time a patient receives professional health care in a physician’s office, hospital outpatient facility or ambulatory surgical center (ASC), the provider must document the services provided. The medical coder will abstract the information from the documentation, assign the appropriate codes, and create a claim to be paid, whether by a commercial payer, the patient, or CMS."