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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Toxic Effects Of Substances Chiefly Nonmedicinal As To Source 980-989 > Toxic Effect Of Other Gases Fumes Or Vapors 987.* > 2007 ICD-9-CM Diagnosis 987.2 Toxic effect of nitrogen oxides  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 987.2 can be accessed here. 987.2 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 987.* hierarchy 987.2 also known as: Nitrogen dioxide Nitrous fumes