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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Inflammatory Diseases Of The Central Nervous System 320-327 > Sleep Disorders 327.* > 2007 ICD-9-CM Diagnosis 327.21 Primary central sleep apnea  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 Therefore, this code may be out of date.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 327.21 can be accessed here. 327.21 is a specific code that can be used to specify a diagnosis 327.21 contains 1 index entry View the ICD-9-CM Volume 1 327.* hierarchy Index entries containing 327.21: Apnea, apneic (spells) 786.03 sleep 780.57 primary central 327.21