The Coders’ Desk Reference for Diagnoses (ICD-10-CM) is a 2020 textbook published by Optum360 and published by Optuminsight, Incorporated. This essential guide is designed for healthcare professionals looking to reference diagnosis codes using the International Classification of Diseases, 10th Revision Clinical Modification (ICD-10-CM). Focused on medical terminology and coding, this English language textbook provides detailed information on various medical conditions and codes, making it a valuable resource for coders and healthcare professionals alike.