This matches referral principles for resistant or complex hypertension and suspected secondary hypertension. The
Textbook of Family Medicine advises considering referral when BP remains above goal on 3 antihypertensives including a diuretic at near-maximal doses (Textbook of Family Medicine 9e, p. 3441-3444), and
ESC guidance specifically flags hypertension with an adrenal incidentaloma for endocrine evaluation.