What are ICD-9 Codes? How can I find data on hospitalizations for asthma or drug abuse?
The 9th Revision of the International Classification of Diseases (ICD-9) classifies diseases and injuries into major grouping or Chapters. There are 17 Chapters plus the V Codes, supplementary classifications relating to health status and use of health services. The ICD-9 Chapters are further subdivided into Sections, which are groupings of diseases identified by three-digit codes. ThereThere are 121 Sections and 999 three-digit codes, plus 82 two-digit V-codes. As an example, the first Chapter, Infectious and Parasitic Diseases, is divided into 15 Sections including Intestinal Infectious Diseases (Codes 001-009), Tuberculosis (010-018), Zoonotic bacterial diseases (020-027), etc. For Drug Abuse, look under the ICD-9 Section for “Neurotic and other Nonpsychotic Mental Disorders (300-316)”. Asthma and other pulmonary diseases can be found in “Chronic Obstructive Pulmonary Disease and Allied Conditions (490-496)”. Why is there so little birth and death data for New York City after 1999?
