2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Hypertensive Disease 401-405 > Essential Hypertension 401.* > 2006 ICD-9-CM Diagnosis 401.9 Unspecified essential hypertension View the most recent version of ICD-9-CM 401.9 401.9 is a specific code that can be used to specify a diagnosis 401.9 contains 10 index entries View the ICD-9-CM Volume 1 401.* hierarchy  Index entries containing 401.9: Blood pressure high (see also Hypertension) 401.9 incidental reading (isolated) (nonspecific), without diagnosis of hypertension 796.2 Disease, diseased - see also Syndrome Huchard's (continued arterial hypertension) 401.9 hypertensive (see also Hypertension) 401.9 Elevation blood pressure (see also Hypertension) 401.9 reading (incidental) (isolated) (nonspecific), no diagnosis of hypertension 796.2 High artery (arterial) tension (see also Hypertension) 401.9 without diagnosis of hypertension 796.2 blood pressure (see also Hypertension) 401.9 incidental reading (isolated) (nonspecific), no diagnosis of hypertension 796.2 Huchard's disease (continued arterial hypertension) 401.9 Hyperpiesia (see also Hypertension) 401.9 Hyperpiesis (see also Hypertension) 401.9 Tension arterial, high (see also Hypertension) 401.9 without diagnosis of hypertension 796.2