Five medical coding systems are commonly used to manage and identify medical codes. HCPCS, ICD 10, and CPT are codes that correspond to individual diagnoses and procedures. These are used to track the patient’s disease and health condition information and are also crucial in the medical billing process. These are used not only in hospitals but also in government healthcare programs like Medicare. Insurance companies use these codes to ensure that patient healthcare policy covers the services before payment. These included ICD 10 PCS, CPT, ICD 11, ICD 10 CM and HCPCS. In the contemporary healthcare industry, understanding these coding systems has become crucial for the medical billing and coding profession. In this article, the focus will be on exploring the three medical coding systems.