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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Hypertensive Disease 401-405 > 2008 ICD-9-CM Diagnosis 401 Essential 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 Therefore, this code may be out of date.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 401 can be accessed here. 401 is a non-specific code that cannot be used to specify a diagnosis 401 includes: high blood pressure hyperpiesia hyperpiesis hypertension (arterial) (essential) (primary) (systemic) hypertensive vascular: degeneration disease 401 excludes: elevated blood pressure without diagnosis of hypertension (796.2) pulmonary hypertension (416.0-416.9) that involving vessels of: brain (430-438) eye (362.11)