Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mary Katherine O'Sullivan, DNP, ARNP

Individual provider Acute Care Nurse Practitioner · NPI 1699389494

Mary Katherine O'Sullivan, DNP, ARNP is an Acute Care Nurse Practitioner in New York, New York. Licensed in New York and Washington. Registered with an NPI since 2020.

Licensed in
NY, WA
In the registry since
2020
Specialties on file
2
What do these letters mean?
DNP — Doctor of Nursing Practice
The highest clinical degree in nursing.
ARNP — Advanced Registered Nurse Practitioner
The title some states use for an advanced practice nurse.

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Practice location Address checks out

1275 York Ave
New York, NY 10065-6007
Phone: (347) 798-9213
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Acute Care Nurse Practitioner (primary) Taxonomy 363LA2100X · Licence 3290436 (NY)
Acute Care Nurse Practitioner Taxonomy 363LA2100X · Licence AP61441998 (WA)

Record details

NPI number1699389494
Entity typeIndividual (Type 1)
GenderFemale
Credentials DNP , ARNP
Sole proprietorNo
NPI enumeratedAugust 31, 2020
Last updated in NPPESMay 5, 2025
Certification dateMay 5, 2025

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