A clinical coder is someone who looks through medical documents and notes and then gives each item a special code number that a computer can understand. The code number is like a way of putting a label on the information so that the computer can find it quickly. The code number also helps doctors and nurses quickly know what kind of care a patient needs. Clinical coders make sure that the code numbers are used in the right way. It's an important job that helps doctors, nurses and other healthcare professionals take care of patients in the best way possible.