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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Hypertensive Disease 401-405 > Secondary Hypertension 405.* > 2007 ICD-9-CM Diagnosis 405.91 Unspecified renovascular hypertension  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 Therefore, this code may be out of date.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 405.91 can be accessed here. 405.91 is a specific code that can be used to specify a diagnosis 405.91 contains 1 index entry View the ICD-9-CM Volume 1 405.* hierarchy Index entries containing 405.91: Elevation renin 790.99 in hypertension (see also Hypertension, renovascular) 405.91