The “Risk Adjustment Coding and HCC Guide by Optum360 (2021, Trade Paperback)” is a textbook published in 2021 by Optuminsight, Incorporated. It is a comprehensive guide in English focusing on medical coding and billing, specifically tailored for Allied Health Services professionals. The book, authored by Optum360, is designed to provide insights and guidance on risk adjustment coding and HCC (Hierarchical Condition Categories) for medical billing purposes. It serves as a valuable resource for those in the healthcare industry looking to enhance their understanding of coding practices.