Gillian Brennan, PA
Medical Physician Assistant · Syosset, NY
Gillian Brennan, PA is a medical physician assistant with a practice address in Syosset, New York, and NPI 1639210750, issued on Feb 9, 2007. Check the license (New York 009844, as entered in NPPES) with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gillian Brennan
- Credential
- PA
- Primary taxonomy
- Medical Physician Assistant 363AM0700X
- License number
- 009844 NY
Self-reported in NPPES; status is on the state search - Practice location
- 221 Jericho Tpke, Syosset, NY 11791
- Phone
- (516) 496-2752
- Enumerated
- Feb 9, 2007
- Record last updated
- Jun 24, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20071204000843); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest medical physician assistant records → All 3,670 in New York → Look up another NPI →
Also registered at 221 Jericho Tpke
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Daniel BosshartAnesthesiology Physician1174529044
- Nancy Bromberg, PAPhysician Assistant1497871370
Verify Gillian Brennan 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 009844Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average medical physician assistant in 2024
17 Medicare Part D claims for 12 beneficiaries, against an average of 1,148 among the 23,801 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
The MIPS final score for 2023 (Medicare payment program): 91.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- North Shore-Lij Medical PCGlen Cove, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gillian Brennan among 3,670 medical physician assistant records in New York
Gillian Brennan, PA is one of 3,670 medical physician assistant records with a practice address in New York. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 19% of them.
- NPI issued2007 · 19% of these records are older, 71% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 49% of these records are
- Graduated2003 · median 2014 among the 1,802 with a school on file
- Record last updated2014 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AM0700X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Physician Assistant providers in New York
There are 3,670 medical physician assistant records in New York.
All 3,670 in New York → Every provider in Syosset → Medical Physician Assistant nationwide →
The 8 medical physician assistant records with the nearest ZIP codes
- Sabrina Bacchus, P.A.Syosset, NY 117911972972826
- Kyle Godden, PA-CSyosset, NY 117911588228860
- Milan Patel, PASyosset, NY 117911932577194
- Anthony Piccinone, P.A.Syosset, NY 117911508915109
- Jamie Shein, PASyosset, NY 117911306078175
- Haley Wipper, PA-CSyosset, NY 117911164160107
- Guy-Philippe BeauzileWading River, NY 117921528476082
- Patricia Clark, RPA-CWading River, NY 117921316170574
Common questions
What is Gillian Brennan, PA's NPI number?
Gillian Brennan, PA's National Provider Identifier (NPI) is 1639210750, issued on Feb 9, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gillian Brennan, PA located?
The NPPES record lists a practice address at 221 Jericho Tpke, Syosset, NY, 11791. Phone: (516) 496-2752. Providers update this record themselves, so call before visiting.
How can I verify Gillian Brennan, PA's license?
NPPES lists New York license number 009844, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.
How much does Gillian Brennan, PA prescribe under Medicare Part D?
In 2024, Gillian Brennan, PA had 17 Medicare Part D claims for 12 beneficiaries; the average among medical physician assistant prescribers was 1,148. Part D covers Medicare prescriptions only.
What is Gillian Brennan, PA's MIPS final score?
The 2023 MIPS final score is 91.3 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.