Jeanna Welborn is a Hematologist Oncology specialist and a Medical Genetics doctor in Merced, California. Dr. Welborn has been practicing medicine for over 42 years is highly rated in 49 conditions, according to our data. Her top areas of expertise are Polycythemia Vera, Chronic Myelogenous Leukemia (CML), Philadelphia-Negative Chronic Myeloid Leukemia, Multiple Myeloma, and Bone Marrow Aspiration.