Medical Coding Practice Test

ICD-9-CM (International Classification of Diseases, 9th Revision, Clinical Modification) is the coding system used to report diagnoses, diseases, and reasons for encounters on insurance claims. This is because ICD-9-CM is the official system used for documenting and reporting diagnoses in the United States. CPT Level III and Level II HCPCS are both coding systems used for procedures and services, not diagnoses. While CPT Level II can be used for reporting medical services, it does not specifically focus on diagnoses. Therefore, B is the correct answer.