2006 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 > 2006 ICD-9-CM Diagnosis 799 Other ill-defined and unknown causes of morbidity and mortality View the most recent version of ICD-9-CM 799 799 is a non-specific code that cannot be used to specify a diagnosis