Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Sean C Osullivan, PHYSICIAN ASSISTANT
Physician Assistant in Brewster, NY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1437103090
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Registry record
Entity type Individual (Type 1)
Name Sean C Osullivan
Credential PHYSICIAN ASSISTANT
Sex Male
Practice address 111 Clock Tower Cmns, Northern Medical Group, Pllc, Brewster, NY, 10509
Phone (845) 592-4915
Fax (845) 592-4914
Enumeration date May 19, 2006
Last updated in NPPES Feb 11, 2017
Taxonomy & licenses
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 009491 (NY) Primary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 02532709 | Medicaid | NY | - |
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.
Frequently asked questions
What is the NPI number for Sean Osullivan?
The National Provider Identifier (NPI) for Sean Osullivan is 1437103090, a Type 1 (individual) record in the CMS NPPES registry.
Where does Sean Osullivan practice?
The practice location on file with NPPES is in Brewster, NY. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Carl Reimers Cardiovascular Disease Physician · Brewster, NY NPI 1639161037 Maddipoti Choudry Cardiovascular Disease Physician · Brewster, NY NPI 1053398495 Thomas Castiglia Family Medicine Physician · Brewster, NY NPI 1457326845 Patrick Grippo Podiatrist · Brewster, NY NPI 1255449518 Sadhis Rivas Endocrinology, Diabetes & Metabolism Physician · Brewster, NY NPI 1659445427 Marcie Wolinsky-Friedland Rheumatology Physician · Brewster, NY NPI 1023138518 Bernadette Dwyer Family Nurse Practitioner · Brewster, NY NPI 1336523851 Northern Medical Group, Pllc Internal Medicine Physician · Brewster, NY NPI 1174994826
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-02-11.