Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mrs. Cynthia J. Onufrak, NP

Adult Health Nurse Practitioner in East Setauket, NY · enumerated 2018 · practices at North Shore Hematology Oncology Associates.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1780153072

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Registry record

Entity type Individual (Type 1)

Name Mrs. Cynthia J. Onufrak

Credential NP

Sex Female

Practice address East Setauket, NY, 11733

Phone (631) 444-2599

Fax (631) 444-1474

Enumeration date Nov 16, 2018

Last updated in NPPES Apr 11, 2019

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

363LA2200X Adult Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 308827 (NY) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Cynthia Onufrak?

The National Provider Identifier (NPI) for Cynthia Onufrak is 1780153072, a Type 1 (individual) record in the CMS NPPES registry.

Where does Cynthia Onufrak practice?

The practice location on file with NPPES is in East Setauket, NY. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Martin Silverstein Radiation Oncology Physician · E Setauket, NY NPI 1952306391 Joseph Cirrone Radiation Oncology Physician · East Setauket, NY NPI 1023013117 Marcia Tonnesen Dermatology Physician · East Setauket, NY NPI 1205883238 Wojciech Kucharski Physician Assistant · East Setauket, NY NPI 1437106523 Bruce Meinhard Orthopaedic Surgery Physician · East Setauket, NY NPI 1750338943 Richard Clark Dermatology Physician · East Setauket, NY NPI 1700825429 Leonard Kristal Pediatric Dermatology Physician · East Setauket, NY NPI 1871533810 Michael Guido Neurology Physician · East Setauket, NY NPI 1477594034

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-04-11.