New Search John R. Fontanilla MD Primary Specialties Internal Medicine Nephrology Address: 4453 Castor Ave., Ste. B Philadelphia, PA 19124 Phone: (215) 744-2266 Fax: (215) 743-9247 Recommend this Physician Education Medical Education - New Jersey Medical School (RE) Residency - Thomas Jefferson University Hospital - Center City Fellowship - Thomas Jefferson University Hospital - Center City