2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Hereditary And Degenerative Diseases Of The Central Nervous System 330-337 > Other Extrapyramidal Disease And Abnormal Movement Disorders 333.* > 2008 ICD-9-CM Diagnosis 333.1 Essential and other specified forms of tremor  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 Therefore, this code may be out of date.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 333.1 can be accessed here. A relatively common disorder characterized by a fairly specific pattern of tremors which are most prominent in the upper extremities and neck, inducing titubations of the head. The tremor is usually mild, but when severe may be disabling. An autosomal dominant pattern of inheritance may occur in some families (i.e., familial tremor). (Mov Disord 1988;13(1):5-10) 333.1 is a specific code that can be used to specify a diagnosis 333.1 contains 7 index entries View the ICD-9-CM Volume 1 333.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 333.1 also known as: Benign essential tremor Familial tremor Medication-induced postural tremor Use additional E code to identify drug, if drug-induced 333.1 excludes: tremor NOS (781.0) Index entries containing 333.1: Disorder - see also Disease tic 307.20 organic origin 333.1 Tremor 781.0 essential (benign) 333.1 familial 333.1 hereditary 333.1 intention 333.1 medication-induced postural 333.1 specified type NEC 333.1