There are numerous reference materials such as anatomical diagrams, surgical descriptions, and CPT Assistant to support accurate coding assignments.
Review a few of the resources available by starting at https://www.ama-assn.org and https://ahima.org and review the Body of Knowledge. Do your own search on CPT Coding or HCPCS at https://www.cms.gov/Medicare/medicare.html.
What have you learned? What kinds of resources are available? How will these reference tools improve your coding? Would you consider the website a credible source of a medical coding resource? Why or why not.