Fiona Ringholz, MB BCHIR, PhDMB BCHIR, PHDUnclaimed · claim itPediatric PulmonologyCambridge, MA10+ years experienceRegistered with an NPI since 2016. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.(617) 355-1900NPI 1851845432View Profile Claim