Athena Health Patient Portal Login. Tel: 574-304-1519. Fax: 574-350-2441. We are a comprehensive, full-time interventional pain clinic Dr. Grewal is a plant based physician who believes in Lifestyle Medicine. Elkhart Office: 700 E Beardsley Ave Ste 4B. Elkhart, IN 46514 Plymouth Office: 1904 Lake Ave..