This course provides an overview of coding and reporting guidelines for diagnostic and screening services. It will cover documentation requirements and medical necessity criteria that help differentiate between screening and diagnostic services. The information in this course applies to facility-based outpatient coders, billers, and revenue cycle managers. This lesson will include outpatient coding information using the International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) diagnosis codes and guidelines. ICD-10-CM codes establish medical necessity by communicating the reason for the screening or diagnostic exam. Learners should have a basic knowledge of facility-based outpatient coding and/or billing regulations before completing this course. The goal of this course is to provide an overview of coding and reporting guidelines for screening and diagnostic testing.