Monday - Friday 8 AM - 5 PM Yale Trained Purba Biswas, MD Board Certified Nephrologist (Kidney Specialist) New Patients Welcome 1840 Paseo San Luis, Sierra Vista AZ 85635 520-459-5959 Monday - Friday 8 AM - 5 PM Yale Trained Purba Biswas , MD Board Certified Nephrologist ( Kidney Specialist ) New Patients Welcome 1840 Paseo San Luis , Sierra Vista AZ 85635 520-459-5959