Peter Merkel is a Rheumatologist in Philadelphia, Pennsylvania. Merkel has been practicing medicine for over 35 years and is rated as an Elite expert by MediFind in the treatment of Granulomatosis with Polyangiitis. He is also highly rated in 24 other conditions, according to our data. His top areas of expertise are Granulomatosis with Polyangiitis, Vasculitis, Microscopic Polyangiitis, Takayasu Arteritis, and Tissue Biopsy. He is licensed to treat patients in Massachusetts and Pennsylvania. Merkel is currently accepting new patients.