Adagio Health Seneca is located at: 3292 State Route 257 PO Box 409 Seneca, PA 16346. Our hours are Monday through Friday, 8am - 4:30pm. Same day appointments or telehealth visits are available by calling 814-676-1811.Walk-ins are welcome, and we are now offering the COVID-19 vaccine to patients ages 12 and up..