Abstract

The Hypertension Table found under the main term “Hypertension” in the Alphabetic Index, of the ICD-9-CM contains a complete listing of all conditions due to or associated with hypertension and classifies them according to malignant, benign, and unspecified. Assign hypertension (arterial) (essential) (primary) (systemic) (NOS) to category code 401 with the appropriate fourth digit to indicate malignant (.0), benign (.1), or unspecified (.9). Do not use either .0 malignant (severely elevated blood pressure) or .1 benign (mildly elevated blood pressure) unless medical record documentation supports such a designation.

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