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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 > Effects Of Air Pressure 993.* > 2008 ICD-9-CM Diagnosis 993.9 Unspecified effect of air pressure  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 Therefore, this code may be out of date.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 993.9 can be accessed here. 993.9 is a specific code that can be used to specify a diagnosis 993.9 contains 1 index entry View the ICD-9-CM Volume 1 993.* hierarchy Index entries containing 993.9: Effect, adverse NEC atmospheric pressure 993.9 due to explosion 993.4 high 993.3 low - see Effect, adverse, high altitude specified effect NEC 993.8