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2007 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 330-338 > Disorders Of The Autonomic Nervous System 337.* > 2007 ICD-9-CM Diagnosis 337.21 Reflex sympathetic dystrophy of the upper limb  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 Therefore, this code may be out of date.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 337.21 can be accessed here. 337.21 is a specific code that can be used to specify a diagnosis 337.21 contains 1 index entry View the ICD-9-CM Volume 1 337.* hierarchy Index entries containing 337.21: Dystrophy, dystrophia 783.9 sympathetic (posttraumatic) (reflex) 337.20 upper limb 337.21