There are very many medical billing schools and colleges that prepare students for the medical billing certification examinations, a test that everyone must pass to have a reasonable chance of getting well-paying employment as a medical biller. This certification can be offered by a number of different training institutions including American Academy of Professional Coders, The Certified Coding Association and the Certified Coding Specialists. To pass these certification tests, a student must possess knowledge in medical billing practices, bookkeeping, medical terminology, various disease processes and pharmacology.