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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of Blood And Blood-Forming Organs 280-289 > Diseases Of White Blood Cells 288.* > 2007 ICD-9-CM Diagnosis 288.5 Decreased white blood cell count  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 Therefore, this code may be out of date.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 288.5 can be accessed here. 288.5 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 288.* hierarchy 288.5 excludes: neutropenia (288.01-288.09)