In Dr. Appel's practice, he is particularly interested in glomerulonephritis, lupus, and nephrotic syndrome. He has a 4.5 out of 5 star average patient rating. Aetna EPO, POMCO, and Blue Cross/Blue Shield are among the insurance carriers that Dr. Appel takes. Before performing his residency at New York-Presbyterian Hospital and Columbia University Medical Center, Dr. Appel attended Albert Einstein College of Medicine of Yeshiva University for medical school. Dr. Appel has received professional recognition including the following: New York Super Doctors; Listed in "Best Doctors in New York" New York Magazine; and 1994-2104 Listed in "Best Doctors in American" Text. He is affiliated with ColumbiaDoctors. He is accepting new patients.