ICD-10 Code I15.8 – Other secondary hypertension (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I15.8 – Other secondary hypertension
What it is
I15.8 identifies secondary hypertension caused by another underlying condition or factor, but not one of the more specific secondary hypertension codes. Use it when documentation states hypertension is secondary and no narrower category is provided.
Clinical signs
Clinical features vary; refer to documentation. Patients typically have elevated blood pressure linked to an identifiable cause, such as another disease process or medication effect, rather than primary essential hypertension.
When to use this code
Use I15.8 when the provider documents secondary hypertension and the cause does not fit a more specific ICD-10 code. It is appropriate when the record confirms a secondary form of hypertension but does not name a different indexed category. Check documentation for the underlying condition and code it separately when instructed.
Do not use for
Do not use this code for primary hypertension or for secondary hypertension with a more specific code available. Do not assign it if the documentation only says “hypertension” without a secondary cause.
Coding tip
Verify the cause of hypertension in the record before selecting I15.8, and code the underlying condition when documented.