2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Symptoms, Signs, And Ill-Defined Conditions 780-799 > Symptoms 780-789 > General Symptoms 780.* > 2008 ICD-9-CM Diagnosis 780.31 Febrile convulsions  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 Therefore, this code may be out of date.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 780.31 can be accessed here. Seizures that occur during a febrile episode. It is a common condition, affecting 2-5% of children aged 3 months to five years. An autosomal dominant pattern of inheritance has been identified in some families. The majority are simple febrile seizures (generally defined as generalized onset, single seizures with a duration of less than 30 minutes). Complex febrile seizures are characterized by focal onset, duration greater than 30 minutes, and/or more than one seizure in a 24 hour period. The likelihood of developing epilepsy (i.e., a nonfebrile seizure disorder) following simple febrile seizures is low. Complex febrile seizures are associated with a moderately increased incidence of epilepsy. (From Menkes, Textbook of Child Neurology, 5th ed, p784) 780.31 is a specific code that can be used to specify a diagnosis 780.31 contains 4 index entries View the ICD-9-CM Volume 1 780.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 780.31 also known as: Febrile seizures NOS Index entries containing 780.31: Convulsions (idiopathic) 780.39 febrile (simple) 780.31 complex 780.32 Febrile (see also Pyrexia) 780.6 convulsion (simple) 780.31 complex 780.32 seizure (simple) 780.31 atypical 780.32 complex 780.32 complicated 780.32 Seizure(s) 780.39 febrile (simple) 780.31 with status epilepticus 345.3 atypical 780.32 complex 780.32 complicated 780.32