Medical billing is a payment practice within the United States health system. The process involves a healthcare provider submitting, and following up on, claims with health insurance companies in order to receive payment for services rendered; such as treatments and investigations. The same process is used for most insurance companies, whether they are private companies or government sponsored programs: Medical coding reports what the diagnosis and treatment were, and prices are applied accordingly. Medical billers are encouraged, but not required by law, to become certified by taking an exam such as the CMRS Exam, RHIA Exam and others. Certification schools are intended to provide a theoretical grounding for students entering the medical billing field. Some community colleges in the United States offer certificates, or even associate degrees, in the field. Those seeking advancement may be cross-trained in medical coding or transcription or auditing, and may earn a bachelor’s or graduate degree in medical information science and technology.