401 Essential hypertension
Includes:
high blood pressure
hyperpiesia
hyperpiesis
hypertension (arterial) (essential) (primary) (systemic)
hypertensive vascular:
degeneration
disease
Excludes:
elevated blood pressure without diagnosis of hypertension (796.2)
pulmonary hypertension (416.0-416.9)
that involving vessels of:
brain (430-438)
eye (362.11)