Thousands of people with HIV received mailed letters from Aetna last month that may have disclosed their HIV status on the envelope. The letters, which Aetna said were sent to approximately 12,000 people, were meant to relay a change in pharmacy benefits. Text visible through a small window on the envelopes listed the patients’ names and suggested a change in how they would fill the prescription for their treatment for the virus. “People have been devastated. We’ve had a number of people tell us they had chosen not to disclose their HIV status to family members — but this is...