Merrill Gershwin is a Rheumatologist and an Allergy and Immunologist in Sacramento, California. Dr. Gershwin is highly rated in 5 conditions, according to our data. His top areas of expertise are Selective Deficiency of IgA, IgG4-Related Disease, Systemic Lupus Erythematosus (SLE), Tissue Biopsy, and Splenectomy.