ICD-10 Code I16.1 – Hypertensive emergency (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I16.1 – Hypertensive emergency
What it is
Hypertensive emergency is a severe rise in blood pressure with acute target-organ damage. It requires urgent medical evaluation because the high pressure is causing immediate harm.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include acute neurologic, cardiac, or renal injury, such as encephalopathy, chest pain, pulmonary edema, or worsening kidney function.
When to use this code
Use I16.1 when the record clearly states hypertensive emergency or describes severe hypertension with acute end-organ damage. The diagnosis should be supported by provider documentation, not just an elevated blood pressure reading.
Assign this code when the emergency is the focus of care or is being actively evaluated during the encounter. Check documentation if the chart only mentions hypertensive urgency, uncontrolled hypertension, or a history of hypertension without acute injury.
Do not use for
Do not use I16.1 for isolated elevated blood pressure without acute organ damage. Do not confuse it with hypertensive urgency or chronic hypertension.
Coding tip
Always look for explicit provider wording or documented target-organ damage before assigning I16.1.