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  3. I00–I99
  4. Hypertensive diseases (I10-I1A)

Hypertensive diseases (I10-I1A)

ICD-10 codes I10 through I1A are used to classify different types of hypertensive diseases, covering essential hypertension, hypertensive complications involving the heart and kidneys, secondary hypertension caused by underlying conditions, and hypertensive crises. These codes help specify the presence, severity, and associated damage caused by high blood pressure.

Essential hypertension (I10) includes primary high blood pressure known as benign hypertension or malignant hypertension, often called "high blood pressure" or "hypertensive crisis." Codes I11 through I13 address hypertension complications affecting the heart, kidneys, or both, such as hypertensive heart disease with or without heart failure (I11.0, I11.9), and chronic kidney disease due to hypertension (I12). Combined cardiac and renal involvement is detailed under I13, distinguishing between stages of kidney disease and heart failure presence. Secondary hypertension (I15) covers high blood pressure resulting from identifiable causes like renovascular disease (I15.0), endocrine disorders (I15.2), or other secondary causes, including drug-induced hypertension. Hypertensive crises (I16) split into urgencies and emergencies requiring prompt treatment. Lastly, other hypertension forms such as resistant hypertension (I1A.0) reflect cases not responding to standard therapies.

Instructional Notations

Use Additional Code

The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.

  • code to identify:
  • exposure to environmental tobacco smoke Z77.22
  • history of tobacco dependence Z87.891
  • occupational exposure to environmental tobacco smoke Z57.31
  • tobacco dependence F17
  • tobacco use Z72.0

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

  • neonatal hypertension P29.2
  • primary pulmonary hypertension I27.0

Type 2 Excludes

A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

  • hypertensive disease complicating pregnancy, childbirth and the puerperium O10 O11 O13 O16