Ismanie Guillaume, M.D.
Internal Medicine Physician · Newark, DE
Ismanie Guillaume, M.D. is an internal medicine physician with a practice address in Newark, Delaware, and NPI 1326571126, issued on Apr 7, 2017. Check the license (Delaware C1-0024308, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- Ismanie Guillaume
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- C1-0024308 DE
Self-reported in NPPES; status is on the state search - Practice location
- 4755 Ogletown Stanton RD, Newark, DE 19718
- Phone
- (908) 977-7695
- Enumerated
- Apr 7, 2017
- Record last updated
- Jun 25, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20211102000300); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 2017
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 600 in Delaware → Look up another NPI →
Also registered at 4755 Ogletown Stanton RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ismanie Guillaume in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDelaware Board of Medical Licensure and Discipline
Search for license C1-0024308Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
231 Medicare Part D claims for 106 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 15 claims were for opioids.
Most prescribed
- Atorvastatin Calcium14 claims
- Cefpodoxime Proxetil14 claims
- Omeprazole12 claims
- Prednisone11 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.
2 hospitals and group practices
- Union Hospital OF Cecil CountyElkton, MD · Acute Care Hospitals4 of 5 stars
- Christiana Care Health Services IncNewark, DE
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.
Ismanie Guillaume among 600 internal medicine physician records in Delaware
Ismanie Guillaume, M.D. is one of 600 internal medicine physician records with a practice address in Delaware. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 66% of them.
- NPI issued2017 · 66% of these records are older, 30% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2017 · median 2008 among the 414 with a school on file
- Record last updated2021 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Delaware practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
240 internal medicine physician records list a practice address in Newark
They are 240 of the 4,662 NPPES records with a practice address in Newark, and 600 internal medicine physician records in Delaware.
All 600 in Delaware → Every provider in Newark → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ramesh Adabala, M.D.,Newark, DE 197181902898596
- Mohammed Ali, MD,FACPNewark, DE 197181982769394
- Diane Bohner, MDNewark, DE 197181538144266
- Christian Coletti, M.D.Newark, DE 197181821133257
- Kevin Copeland, D.O.Newark, DE 197181265563571
- Roshni Guerry, MDNewark, DE 197181801808308
- Azhar Khan, M.D.Newark, DE 197181851362909
- Asma Mian, M.D.Newark, DE 197181144290453
Common questions
What is Ismanie Guillaume, M.D.'s NPI number?
Ismanie Guillaume, M.D.'s National Provider Identifier (NPI) is 1326571126, issued on Apr 7, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Ismanie Guillaume, M.D. located?
The NPPES record lists a practice address at 4755 Ogletown Stanton RD, Newark, DE, 19718. Phone: (908) 977-7695. Providers update this record themselves, so call before visiting.
How can I verify Ismanie Guillaume, M.D.'s license?
NPPES lists Delaware license number C1-0024308, as entered by the provider. Search the Delaware Board of Medical Licensure and Discipline at https://delpros.delaware.gov/OH_VerifyLicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ismanie Guillaume, M.D. prescribe under Medicare Part D?
In 2024, Ismanie Guillaume, M.D. had 231 Medicare Part D claims for 106 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.