ðɪ ˌɛnpˌiːˈaɪ ɪz ɐ dˈeɪɾə kˈiː ðæt aɪdˈɛntᵻfˌaɪz ɐ səbstˈænʃəl pˈoːɹʃən ʌv hˈɛlθkɛɹ pɹəvˈaɪdɚz ænd ˈʌðɚɹ ˈɛntᵻɾiz ɪnðə jˌuːˈɛs, ɪɾ ɪz ɐ fɹˈiːkwəntli jˈuːzd dˈeɪɾə kˈiː ɪn ˈʌðɚ dˈeɪɾə sˈoːɹsᵻz.
The NPI is a data key that identifies a substantial portion of healthcare providers and other entities in the US, it is a frequently used data key in other data sources.