ICD-9-CM Vol. 1 Diagnostic Codes →
7. DISEASES OF THE CIRCULATORY SYSTEM (390-459) →
section notes
HYPERTENSIVE DISEASE (401-405) →
section notes
401 Essential hypertension →
section notes
401.0   Malignant hypertension
401.1   Benign hypertension
401.9   Hypertension NOS
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