Resistant hypertension

This code represents hypertension that remains above goal despite concurrent use of three or more antihypertensive agents of different classes, including a diuretic, at optimal doses. It also applies to patients whose blood pressure is controlled but requires four or more medications. This condition indicates a more complex and challenging form of high blood pressure.

Use this code when documentation explicitly states "resistant hypertension" or describes a patient meeting the criteria for resistant hypertension (e.g., uncontrolled BP on 3+ meds including a diuretic, or controlled BP on 4+ meds). This code is appropriate for ongoing management and evaluation of such cases.

• Do not confuse with uncontrolled hypertension (I10) or refractory hypertension; resistant hypertension has specific medication criteria.
• Always sequence this code as the primary diagnosis if it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting treatment.
• Ensure the medical record clearly supports the diagnosis with details on medication regimen and blood pressure readings.