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ICD-9-CM
7. DISEASES OF THE CIRCULATORY SYSTEM (390-459)
HYPERTENSIVE DISEASE (401-405)
HYPERTENSIVE DISEASE (401-405)
401 Essential hypertension
401.0-401.9
402 Hypertensive heart disease
402.00-402.91
403 Hypertensive chronic disease
403.00-403.91
404 Hypertensive heart and chronic disease
404.00-404.93
405 Secondary hypertension
405.01-405.99