The International Statistical Classification of Diseases and Related Health Problems (most commonly known by the abbreviation ICD) is a medical classification that provides codes to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances, and external causes of injury or disease. ...
The International Classification of Diseases is published by the World Health Organization (WHO) and used worldwide for morbidity and mortality statistics, reimbursement systems, and automated decision support in medicine.
ICD-9 code 313.83: Academic underachievement disorder
--The official WHO proclamation that that A-minus is a disease