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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Supplementary Classification Of External Causes Of Injury And Poisoning E800-E999 > Other Accidents E916-E928 > ICD-9-CM Diagnosis E921 Accident caused by explosion of pressure vessel E921 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis E921.0 Accident caused by explosion of boilers E921.0 is a specific code that can be used to specify a diagnosis ICD-9-CM Diagnosis E921.1 Accident caused by explosion of gas cylinders E921.1 is a specific code that can be used to specify a diagnosis ICD-9-CM Diagnosis E921.8 Accident caused by explosion of other specified pressure vessels E921.8 is a specific code that can be used to specify a diagnosis ICD-9-CM Diagnosis E921.9 Accident caused by explosion of unspecified pressure vessel E921.9 is a specific code that can be used to specify a diagnosis