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The entity responsible for maintaining the official guidelines for ICD-10-CM is the National Center for Health Statistics (NCHS). The NCHS is a part of the Centers for Disease Control and Prevention (CDC) and works closely with the Centers for Medicare & Medicaid Services (CMS) to oversee the coding system including the development and update of coding guidelines.

While AHIMA (American Health Information Management Association) is an influential organization within the health information management community and plays a role in coding education and the promotion of best practices, it is not the official maintainer of the ICD-10-CM guidelines. Instead, AHIMA provides resources, training, and support for coders and health information professionals in using these guidelines effectively.

CMS, as a federal agency, does play a significant role in the implementation and use of ICD-10-CM within Medicare and Medicaid programs but does not maintain the official guidelines. The American Hospital Association (AHA) also contributes to healthcare coding and billing practices but is not directly responsible for the guidelines themselves.

Understanding which organization specifically oversees these guidelines is crucial for anyone working in the medical coding field, as it helps ensure compliance and accuracy in coding practices.