Katherine C Ma, MD

At Optum, we help adults and children breathe easier and improve their overall health. With an office conveniently located in Jefferson Valley, NY, our allergists offer care for a wide range of issues including eczema, skin rashes, itchy eyes, hives, sinusitis and more. If you aren't sure what is causing your symptoms, our diagnostic testing can help poinpoint the problem. These tests include allergy skin/patch testing, asthma testing and environmental allergy testing. Optum accepts most major health plans.

Jim L Koo, MD is a board-certified physician, specializing in Internal medicine. With an office conveniently located in Jefferson Valley, NY, Dr. Koo can help with your everyday health needs, from regular checkups to caring for you when you’re injured or ill. At Optum, primary care physicians can oversee all your health care needs. We care for short-term health problems like the common cold or a sprained ankle. Or, long-term health problems, such as allergies, high blood pressure, heart disease and diabetes. Our doctors will work with specialists to make sure you get any extra care you might need. Optum accepts most major health plans.