Secondary hypertension (I15) ICD-10-CM
The I15 code range covers secondary hypertension with 6 ICD-10-CM diagnosis codes. 5 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Code Also
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.
- postprocedural hypertension I97.3
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.
Codes in the I15 Range 6 codes · 5 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I15 range.
Hypertensive Crisis
A severe, acute increase in BLOOD PRESSURE that may result in STROKE or MYOCARDIAL ISCHEMIA.
About the I15 Code Range
ICD-10 code I15 and its subcategories cover secondary hypertension, a type of high blood pressure caused by an underlying condition. These codes are specifically used to identify and document hypertension resulting from renal, endocrine, or other distinct causes rather than primary hypertension.
The code I15.0 represents renovascular hypertension, also known as Goldblatt hypertension or renal arterial hypertension, caused by narrowing of arteries supplying the kidneys. Subcode I15.1 applies when hypertension is secondary to other kidney disorders, including various stages of chronic kidney disease, especially those related to diabetes or dialysis. The I15.2 code is specific for hypertension linked to endocrine disorders, such as congenital adrenal hyperplasia. I15.8 captures other forms of secondary hypertension caused by miscellaneous factors like drugs, transplantation, or congenital heart issues. When the exact cause isn’t specified, I15.9 is used. Using these codes helps precisely classify hypertension due to specific medical causes, which medical coders need when assigning the correct ICD-10 code for secondary hypertension scenarios.
Questions About This Page
How many billable codes are in the I15 range?
Of the 6 codes in this range, 5 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the I15 range classify?
The range classifies secondary hypertension. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
