It is crucial for you to understand medical billing and coding as a healthcare professional in order to prevent issues that could result from incorrect billing. The biggest billing challenge facing healthcare professionals today is keeping up with ever-changing healthcare laws and regulations. This has led to a surge in the number of medical billing companies in Los Angeles. Private insurance, Medicare, Medicaid, and Tricare are the four primary healthcare systems in the US. Medical billing is the process of submitting claims to health insurance providers and then following up to get payment for the services provided by a healthcare practitioner.