A 68-year-old member from Great Barrington, United States, developed worsening symptoms of acute mountain sickness with suspected high altitude pulmonary edema while on Mera Peak in Nepal. Her spouse reported increasing weakness, shortness of breath that worsened when lying flat due to congestion, a dry cough, persistent headache, nausea and multiple episodes of diarrhea. After remote assessment, the operations team approved a helicopter evacuation from Thagnak to a hospital in Lukla. She was safely transported, evaluated and diagnosed with acute mountain sickness, then monitored for several hours. As her condition improved she was discharged with medications and detailed instructions on warning signs to watch for after discharge. The member and her spouse declined further check-ins but understood they could contact the operations team if her condition changed.