How do you get cridentials for medical billing and coding?

You must go to a College/ University and take many modules on Medical Insurance, Medical Billing, and Coding and then you must work really hard at school to get to know What Medical Billing is and stands for, wish Insurance companies will you be billing, Then you need to study on ALL the Procedural codes and Diagnostic codes as well. Last but not least you need to know about all your Medical Insurance's like your HMO's PPO's Medicare and Medical and what they are willing to cover out of pocket for their Patients.