fɔːɹ ˈɪnstəns, ðə dˈɑːk ɡɹˈæf dˈeɪɾə sˈɛt ɪz ɐ kɹˈaʊdfʌndᵻd ˈoʊpən dˈeɪɾə sˈɛt ðæt diːtˈeɪlz hˌaʊ hˈɛlθkɛɹ pɹəvˈaɪdɚz kəlˈæbɚɹˌeɪt tə dᵻlˈɪvɚ kˈɛɹ ˈaɪ.ˈiː. ɹᵻfˈɜːɹəl pˈætɚnz ðæt jˈuːzᵻz ðɪ ˌɛnpˌiːˈaɪ æz ɪts dˈeɪɾə kˈiː.
For instance, the DocGraph data set is a crowdfunded open data set that details how healthcare providers collaborate to deliver care (i.e. referral patterns) that uses the NPI as its data key.