Focuses on the use of the book `International Classification of Diseases, Ninth Revision, Clinical Modification ICD-9-CM) in coding diseases for reimbursement claims in the United States. Differences from `Current Procedural Terminology' codes; Organization of ICD-9 codes; Challenges in coding patients with multiple diagnoses; Coding of suspected diagnoses. INSETS: ICD-9 coding challenges;FPM resources for ICD-9 coding.