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2008 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.* > 2008 ICD-9-CM Diagnosis 987.4 Toxic effect of freon 987.4 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 987.* hierarchy 987.4 also known as: Dichloromonofluoromethane