John H. Oneill, DO
Internal Medicine Physician · Newark, DE
John H. Oneill, DO is an internal medicine physician with a practice address in Newark, Delaware, and NPI 1265445233, issued on Aug 14, 2006. Check the license (Delaware C20003347, as entered in NPPES) on the Delaware Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- John H. Oneill
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- C20003347 DE
C2-0003347 DE
Self-reported in NPPES; status is on the state search - Practice location
- 4755 Ogletown Stanton RD Ste 5A43, Newark, DE 19718
- Phone
- (302) 623-0188
- Enumerated
- Aug 14, 2006
- Record last updated
- Sep 24, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicaid ID
- 1689862492 DE
- Medicare enrollment
- Enrolled (PECOS I20080305000512); accepts Medicare assignment
- Medical or professional school
- Des Moines University Of Osteopathic Medicine And Health Sciences, 1986
- 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 Ste 5A43
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John H. Oneill 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 C20003347Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
166 Medicare Part D claims for 78 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
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
- Christiana Care Health Services IncWilmington, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John H. Oneill among 600 internal medicine physician records in Delaware
John H. Oneill, DO 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 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 68% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1986 · median 2008 among the 414 with a school on file
- Record last updated2018 · 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 John H. Oneill, DO's NPI number?
John H. Oneill, DO's National Provider Identifier (NPI) is 1265445233, issued on Aug 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John H. Oneill, DO located?
The NPPES record lists a practice address at 4755 Ogletown Stanton RD Ste 5A43, Newark, DE, 19718. Phone: (302) 623-0188. Providers update this record themselves, so call before visiting.
How can I verify John H. Oneill, DO's license?
NPPES lists Delaware license number C20003347, 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 John H. Oneill, DO prescribe under Medicare Part D?
In 2024, John H. Oneill, DO had 166 Medicare Part D claims for 78 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.