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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Musculoskeletal System And Connective Tissue 710-739 > Dorsopathies 720-724 > Spondylosis And Allied Disorders 721.* > 2008 ICD-9-CM Diagnosis 721.9 Spondylosis of unspecified site  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 Therefore, this code may be out of date.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 721.9 can be accessed here. 721.9 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 721.* hierarchy