CPC medical coding is essential for accurate and reliable health-care industry records. A person who is interested in providing this type of service can get as much as 20 percent more pay if he or she is a certified professional coder. Individuals can receive this certificate after receiving the proper training and passing a rigorous assessment. Knowledge of medical codes for the use of diagnosis and services provided in the medical field is a requirement for this type of work. In addition, people who perform this service should have a thorough understanding of regulations in coding practices. Knowledge of biology and anatomy is also needed.