Nelly Leon-Chisen, RHIA, is the Executive Director, Coding and Classification/Executive Editor Coding Clinic Publications at the American Hospital Association where she is responsible for leading the AHA Central Office on ICD-10-CM and ICD-10-PCS and Central Office on HCPCS. She represents the AHA as one of the four ICD-10 Cooperating Parties. She is also the executive editor of AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS and AHA Coding Clinic® for HCPCS, and author of ICD-10-CM and ICD-10-PCS Coding Handbook published by AHA Press. She has over 30 years’ experience in the health information management field including consulting, teaching, technical and management experience in hospital medical record departments. She is a Past President of the Chicago Area Health Information Management Association and a recipient of the Professional Achievement Award from the Illinois Health Information Management Association. She has lectured extensively on coding, DRG and data quality issues throughout the United States and internationally. She has also testified on behalf of the American Hospital Association at numerous National Committee on Vital and Health Statistics hearings on ICD-10-CM and ICD-10-PCS.