2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Symptoms, Signs, And Ill-Defined Conditions 780-799 > Ill-Defined And Unknown Causes Of Morbidity And Mortality 797-799 > Sudden Death Cause Unknown 798.* > 2008 ICD-9-CM Diagnosis 798.1 Instantaneous death  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 Therefore, this code may be out of date.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 798.1 can be accessed here. 798.1 is a specific code that can be used to specify a diagnosis 798.1 contains 7 index entries View the ICD-9-CM Volume 1 798.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. Index entries containing 798.1: Death instantaneous 798.1 sudden (cause unknown) 798.1 cardiac (SCD) family history of V17.41 personal history of, successfully resuscitated V12.53 during delivery 669.9 under anesthesia NEC 668.9 infant, syndrome (SIDS) 798.0 puerperal, during puerperium 674.9 violent 798.1 Dropped dead 798.1 Fatal syncope 798.1 Sudden death, cause unknown (less than 24 hours) 798.1 cardiac (SCD) family history of V17.41 personal history of, successfully resuscitated V12.53 during childbirth 669.9 infant 798.0 puerperal, postpartum 674.9 Syncope (near) (pre-) 780.2 fatal 798.1