ICD 9 code for hypertension

Posted by adminDecember 20, 2013ICD 9, ICD 9 code
ICD 9 code for hypertension

Hypertension or high blood pressure is a chronic condition in which pressure exhibited by blood on the arteries is elevated. It is measured in terms of systolic (contracting) and diastolic (relaxing) pressures. The normal blood pressure is generally observed in the range of 140/90 mmHg. High blood pressure exists if systolic and diastolic measurements are constantly above the mentioned limit.

Hypertension can be classified as;

-          Primary hypertension

  • This categorizes hypertension under no underlying medical causes
  • Constitutes more than 90% of the cases

-          Secondary hypertension

  • This categorizes hypertension occurring due to conditions which affect arteries, kidneys and endocrine system
  • Constitutes remaining 10% of the cases

Signs and symptoms of hypertension

As such primary hypertension does not exhibit clear symptoms, it is identified while screening of any health related issue. Most people suffering from hypertension report headache, vertigo, discomfort in ear, blurred vision and fainting, as well.  Hypertension can only be assumed on the basis of physical examination of the eye with ophthalmoscopy. It can identify the period for which the person has been hypertensive. In contrast to the primary hypertension, secondary hypertension may have some additional signs and symptoms because it can be caused due to disorders of kidney and endocrine system.

In ICD9 coding, all the hypertensive diseases were classified under 401 to 405. Primary hypertension is classified under the category 401 (Essential hypertension).

401 Essential hypertension
402 Hypertensive heart disease
403 Hypertensive chronic kidney disease
404 Hypertensive heart and chronic kidney disease
405 Secondary hypertension


All these categories (401 – 405) are sub-classified based on the type of hypertension. This sub-classification is represented with the fourth digit in the code.

0 Malignant
1 Benign
9 Unspecified

General hypertension is represented with the code 997.91 and classified under the category 997 (Complications affecting specified body systems, not elsewhere classified).

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