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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Other And Unspecified Effects Of External Causes 990-995 > ICD-9-CM Diagnosis 990 Effects of radiation unspecified Biological consequences of radiation. The effects of ionizing and nonionizing radiation upon living organisms, organs and tissues, and their constituents, and upon physiologic processes. It includes the effect of irradiation on drugs and chemicals. 990 is a specific code that can be used to specify a diagnosis 990 contains 43 index entries