Secondary hypertension (I15)
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.
Instructional Notations
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.
- secondary hypertension involving vessels of brain I60 I69
- secondary hypertension involving vessels of eye H35.0
Clinical Terms
The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.
Hypertensive Crisis
A severe, acute increase in BLOOD PRESSURE that may result in STROKE or MYOCARDIAL ISCHEMIA.
