Find and verify NPI numbers, names, addresses, specialties, and more for doctors, groups, and organizations in the US. NPI Number Lookup is a free and easy-to-use tool that syncs with the official NPI Registry database. The NPI database contains over 6 million doctors & health care providers. Search the NPI database by name or NPI number. Use our NPI lookup to find any health care provider in the NPI Registry. Search and browse healthcare providers in the National Provider Identifier ( NPI ) registry. Find doctors, hospitals, medical groups, and other healthcare organizations. Find individual healthcare providers including physicians, nurses, therapists, and other practitioners.