ICD-9-CM Vol. 1 Diagnostic Codes

7. DISEASES OF THE CIRCULATORY SYSTEM (390-459)

section notes

HYPERTENSIVE DISEASE (401-405)

section notes
401.0401.9   401 Essential hypertension
402.00402.91   402 Hypertensive heart disease
403.00403.91   403 Hypertensive chronic disease
404.00404.93   404 Hypertensive heart and chronic disease
405.01405.99   405 Secondary hypertension
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