Michael J. Ostolski, FNP earned a degree of a Family Nurse Practitioner. Licenses and Affiliations. Michael J. Ostolski, FNP has been registered with the National Provider Identifier database since April 17, 2006, and his NPI number is 1851355747. Book an Appointment. To schedule an appointment with Mr. Michael J. Ostolski, please call (585 ....