Gregory M. Singer, MD Specialties Primary CareFamily Medicine Make an Appointment Independent Cliniciani Accepting New Patients View Location LocationPhone Gregory M. Singer, MD, PC 227 S Route 100 Allentown, PA 18106-9212 United States Get Directions in Google Maps to 227 S Route 100, Allentown 18106-9212 Get Directions in Google Maps (Map) 610-366-1000 Gregory M. Singer, MD, PC 227 S Route 100 Allentown, PA 18106-9212 United States Get Directions in Google Maps to 227 S Route 100, Allentown 18106-9212 Get Directions in Google Maps (Map) 610-366-1000