To become a medical billing specialist, you have to be a patient person with good organization skills since your job will entail posting, collecting and managing account payments for a medical institution or office. In order to get a medical billing certification, you have to complete a degree or a certificate from an accredited program including Medical Billing Practices, Office Coding, Legal Aspects and Medical Terminology. The Certified Medical Billing Specialist examination is an exam you can do through the Medical Association of Medical Biller to be accredited in this field.