Pen-Laing Chang, MDMDUnclaimed · claim itPediatric Neonatal-Perinatal…Rancho Cucamonga, CA21+ years experienceRegistered with an NPI since 2005. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.(909) 989-3875NPI 1457358897View Profile Claim