Sean C. Osullivan, PHYSICIAN ASSISTANT
Physician Assistant · Brewster, NY
Sean C. Osullivan, PHYSICIAN ASSISTANT is a physician assistant with a practice address in Brewster, New York, and NPI 1437103090, issued on May 19, 2006. Check the license (New York 009491, as entered in NPPES) with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Sean C. Osullivan
- Credential
- PHYSICIAN ASSISTANT
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 009491 NY
Self-reported in NPPES; status is on the state search - Practice location
- 111 Clock Tower Cmns, Brewster, NY 10509
- Phone
- (845) 592-4915
- Enumerated
- May 19, 2006
- Record last updated
- Feb 11, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (845) 592-4914
- Medicaid ID
- 02532709 NY
- Medicare enrollment
- Enrolled (PECOS I20040723000050); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 15,555 in New York → Look up another NPI →
Also registered at 111 Clock Tower Cmns
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Thomas Castiglia, M.D.Family Medicine Physician1457326845
- Maddipoti Choudry, M.D.Cardiovascular Disease Physician1053398495
- Justin Chua, MDFamily Medicine Physician1154856755
- Nicole Cruci, NPFamily Nurse Practitioner1710348263
- Bernadette Dwyer, NPFamily Nurse Practitioner1336523851
- Jamie FontanaPhysician Assistant1396507711
Verify Sean C. Osullivan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New York board licenses this profession
Search for license 009491Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
44% fewer Medicare Part D claims than the average physician assistant in 2024
466 Medicare Part D claims for 327 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
Most prescribed
- Doxycycline Hyclate72 claims
- Amoxicillin-Clavulanate Potass60 claims
- Fluticasone Propionate54 claims
- Cefdinir37 claims
- Azithromycin35 claims
- Prednisone23 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Optum Medical Care PCMount Kisco, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sean C. Osullivan among 15,555 physician assistant records in New York
Sean C. Osullivan, PHYSICIAN ASSISTANT is one of 15,555 physician assistant records with a practice address in New York. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 1% of them.
- NPI issued2006 · 1% of these records are older, 87% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated2003 · median 2018 among the 8,158 with a school on file
- Record last updated2017 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
5 physician assistant records list a practice address in Brewster
They are 5 of the 577 NPPES records with a practice address in Brewster, and 15,555 physician assistant records in New York.
All 15,555 in New York → Every provider in Brewster → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Lisa Boston, PABrewster, NY 105091841327939
- Jamie FontanaBrewster, NY 105091396507711
- Makayla KoehlerBrewster, NY 105091861357261
- Joseph Medwid, PA-CBrewster, NY 105091033970793
- Lindsay Trainham, PA-CBriarcliff Manor, NY 105101760604615
- Julie Cohen, PA-CBedford Hills, NY 105071639588924
- Colleen McNameeBedford Hills, NY 105071356115364
- Karolyn Chang, PACarmel, NY 105121972862845
Common questions
What is Sean C. Osullivan, PHYSICIAN ASSISTANT's NPI number?
Sean C. Osullivan, PHYSICIAN ASSISTANT's National Provider Identifier (NPI) is 1437103090, issued on May 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Sean C. Osullivan, PHYSICIAN ASSISTANT located?
The NPPES record lists a practice address at 111 Clock Tower Cmns, Brewster, NY, 10509. Phone: (845) 592-4915. Providers update this record themselves, so call before visiting.
How can I verify Sean C. Osullivan, PHYSICIAN ASSISTANT's license?
NPPES lists New York license number 009491, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.
How much does Sean C. Osullivan, PHYSICIAN ASSISTANT prescribe under Medicare Part D?
In 2024, Sean C. Osullivan, PHYSICIAN ASSISTANT had 466 Medicare Part D claims for 327 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.