Cornelius John Oneill, M.D.
Internal Medicine Physician · Jackson, MS
Cornelius John Oneill, M.D. is an internal medicine physician with a practice address in Jackson, Mississippi, and NPI 1962420257, issued on Jul 17, 2006. Check the license (Mississippi 09997, as entered in NPPES) on the Mississippi State Board of Medical Licensure; the Medicare figures below come from public CMS files.
- Name
- Cornelius John Oneill
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 09997 MS
Self-reported in NPPES; status is on the state search - Practice location
- 1500 E Woodrow Wilson Ave, Jackson, MS 39216
- Phone
- (601) 362-4471
- Enumerated
- Jul 17, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (601) 368-4089
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 972 in Mississippi → Look up another NPI →
Also registered at 1500 E Woodrow Wilson Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Cornelius John Oneill in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMississippi State Board of Medical Licensure
Search for license 09997Check 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 internal medicine physician in 2024
31 Medicare Part D claims, against an average of 3,176 among the 108,855 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.
Cornelius John Oneill among 972 internal medicine physician records in Mississippi
Cornelius John Oneill, M.D. is one of 972 internal medicine physician records with a practice address in Mississippi. 82% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 63% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2007 · 52% 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 Mississippi practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
328 internal medicine physician records list a practice address in Jackson
They are 328 of the 6,997 NPPES records with a practice address in Jackson, and 972 internal medicine physician records in Mississippi.
All 972 in Mississippi → Every provider in Jackson → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mark Enderle, MDJackson, MS 392161477598522
- Barbara Fedor, MDJackson, MS 392161366472896
- James Glisson, M.D.Jackson, MS 392161245274281
- Jo Harbour, MDJackson, MS 392161609809771
- Denise Harkins, MDJackson, MS 392161124094453
- Richard Jackson, M.D.Jackson, MS 392161134153687
- Harriet Jones, M.DJackson, MS 392161184672750
- Robert Lynch, M.D.Jackson, MS 392161780614339
Common questions
What is Cornelius John Oneill, M.D.'s NPI number?
Cornelius John Oneill, M.D.'s National Provider Identifier (NPI) is 1962420257, issued on Jul 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Cornelius John Oneill, M.D. located?
The NPPES record lists a practice address at 1500 E Woodrow Wilson Ave, Jackson, MS, 39216. Phone: (601) 362-4471. Providers update this record themselves, so call before visiting.
How can I verify Cornelius John Oneill, M.D.'s license?
NPPES lists Mississippi license number 09997, as entered by the provider. Search the Mississippi State Board of Medical Licensure at https://www.msbml.ms.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cornelius John Oneill, M.D. prescribe under Medicare Part D?
In 2024, Cornelius John Oneill, M.D. had 31 Medicare Part D claims; 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.