ICD-9-CM Vol. 1 Diagnostic Codes →
7. DISEASES OF THE CIRCULATORY SYSTEM (390-459) →
section notes
HYPERTENSIVE DISEASE (401-405) →
section notes
401.0‑401.9   401 Essential hypertension
402.00‑402.91   402 Hypertensive heart disease
403.00‑403.91   403 Hypertensive chronic disease
404.00‑404.93   404 Hypertensive heart and chronic disease
405.01‑405.99   405 Secondary hypertension
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