About Harinder Singh, MD. Harinder Singh, MD is a rheumatologist and geriatric internal medicine doctor who practices at Physicians' Clinic Of Iowa, PC located at 202 10th Street SE in Cedar Rapids, IA 52403 (Linn County). Dr. Harinder Singh may be affiliated with: Pruchno Medicine Llc. / Health Transitions Clinic in Cedar Rapids, IA 52403.