3The ICD-10-CM Coding Handbook is the only guide published in collaboration with the Central Office of the American Hospital Association. The Central Office is the official industry body that prepares the AHA Coding Clinic. The Handbook helps coders understand the principles behind the classification system so they can apply the official coding advice found in the Coding Manual. Academic and in-service instructors can easily arrange course outlines and study exercises around Handbook chapters to train new and experienced coders.