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 993.4 Effects of air pressure caused by explosion  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 Therefore, this code may be out of date.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 993.4 can be accessed here. 993.4 is a specific code that can be used to specify a diagnosis 993.4 contains 1 index entry View the ICD-9-CM Volume 1 993.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. Index entries containing 993.4: Effect, adverse NEC atmospheric pressure 993.9 due to explosion 993.4