ICD-10-CM Tabular Index · Chapter 9 · FY 2026 I10–I1A
Hypertensive diseases (I10-I1A) ICD-10-CM
The I10–I1A section covers hypertensive diseases with 25 ICD-10-CM diagnosis codes, of which 18 are billable in fiscal year 2026. The section is organized into the 7 code ranges listed below.
✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
7
Code Ranges
25
Diagnosis Codes
18
Billable Codes
I10–I1A
Code Range
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.
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.
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 O10O11O13O16
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the I10–I1A Code Range
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.
Questions About This Page
How many codes are in the I10-I1A range?
The I10-I1A range contains 25 ICD-10-CM diagnosis codes in FY 2026. 18 of them are billable, and the rest are category headers that organize the section.
What conditions does I10-I1A cover?
The range covers hypertensive diseases. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
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.
hypertensive disease complicating pregnancy, childbirth and the puerperium O10O11O13O16
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.
essential primary hypertension involving vessels of brain I60I69
essential primary hypertension involving vessels of eye H35.0
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.
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.
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
underlying condition
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.
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.
secondary hypertension involving vessels of brain I60I69
secondary hypertension involving vessels of eye H35.0
