About MARY PASTERNACKI. Mary Pasternacki is a provider established in Flagstaff, Arizona and her medical specialization is nurse practitioner (family) with more than 25 years of experience. The NPI number of Mary Pasternacki is 1275690331 and was assigned on January 2007. The practitioner's primary taxonomy code is 363LF0000X with license number AZ0647 (AZ)..