Cassis Guy, M.D.
Emergency Medicine Physician · Brooklyn, NY
Cassis Guy, M.D. is an emergency medicine physician with a practice address in Brooklyn, New York, and NPI 1629418058, issued on Jun 30, 2013. Check the license on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Cassis Guy
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 56269 CT
Self-reported in NPPES; status is on the state search - Practice location
- 450 Clarkson Ave # 1228, Brooklyn, NY 11203
- Phone
- (718) 245-3318
- Enumerated
- Jun 30, 2013
- Record last updated
- Mar 24, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (718) 245-4799
- Medicare enrollment
- Enrolled (PECOS I20170828000505); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Stony Brook, School Of Medicine, 2013
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 5,025 in New York → Look up another NPI →
Also registered at 450 Clarkson Ave # 1228
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jennifer Ballinger, MDEmergency Medicine Physician1174775449
- Gabrielle Fonteneaux, MDStudent in an Organized Health Care Education/Training Program1477016871
- David Gurley, M.D.Emergency Medicine Physician1457577751
- Jessica Kim, DOStudent in an Organized Health Care Education/Training Program1073208120
- Sally Liang, MDEmergency Medicine Physician1992145254
Verify Cassis Guy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the ProfessionsCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average emergency medicine physician in 2024
47 Medicare Part D claims for 39 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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.
One hospital affiliation
- Bridgeport HospitalBridgeport, CT · Acute Care Hospitals4 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Cassis Guy among 5,025 emergency medicine physician records in New York
Cassis Guy, M.D. is one of 5,025 emergency medicine physician records with a practice address in New York. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 56% of them.
- NPI issued2013 · 56% of these records are older, 41% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2013 · median 2013 among the 3,232 with a school on file
- Record last updated2020 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
719 emergency medicine physician records list a practice address in Brooklyn
They are 719 of the 64,057 NPPES records with a practice address in Brooklyn, and 5,025 emergency medicine physician records in New York.
All 5,025 in New York → Every provider in Brooklyn → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Konstantinos AgoritsasBrooklyn, NY 112031720070600
- Bonnie ArquillaBrooklyn, NY 112031295727170
- Gerard Casey, MDBrooklyn, NY 112031194717868
- Joseph Chirayil, MDBrooklyn, NY 112031023000916
- Ian Desouza, MDBrooklyn, NY 112031659363448
- Rachel GeorgeBrooklyn, NY 112031588656052
- Aleksandr Gleyzer, MDBrooklyn, NY 112031417949165
- Ernst Gustave, MDBrooklyn, NY 112031124010871
Common questions
What is Cassis Guy, M.D.'s NPI number?
Cassis Guy, M.D.'s National Provider Identifier (NPI) is 1629418058, issued on Jun 30, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Cassis Guy, M.D. located?
The NPPES record lists a practice address at 450 Clarkson Ave # 1228, Brooklyn, NY, 11203. Phone: (718) 245-3318. Providers update this record themselves, so call before visiting.
How can I verify Cassis Guy, M.D.'s license?
Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cassis Guy, M.D. prescribe under Medicare Part D?
In 2024, Cassis Guy, M.D. had 47 Medicare Part D claims for 39 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.