John J. O'Connor, M.D.
Family Medicine Physician · O Fallon, MO
John J. O'Connor, M.D. is a family medicine physician with a practice address in O Fallon, Missouri, and NPI 1356392310, issued on May 15, 2006. Check the license (Missouri 35988, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John J. O'Connor
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 35988 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1002 Peruque Crossing CT, O Fallon, MO 63366
- Phone
- (636) 294-5900
- Enumerated
- May 15, 2006
- Record last updated
- Nov 13, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (636) 294-5908
- Entity
- Type 1 · individual
Also registered at 1002 Peruque Crossing CT
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Julia Branco, FNP-CFamily Nurse Practitioner1245669316
- Jennifer Hinton, MDPediatrics Physician1881655454
- Matthew MeierInternal Medicine Physician1578574372
- Kevin Weikart, M.D.Internal Medicine Physician1902864986
Verify John J. O'Connor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 35988Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37 family medicine physician records list a practice address in O Fallon
They are 37 of the 1,225 NPPES records with a practice address in O Fallon, and 2,991 family medicine physician records in Missouri. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 37 in O Fallon → All 2,991 in Missouri → Every provider in O Fallon →
Other family medicine physician records in Missouri
- Mohammad Abbas, DOKirksville, MO1518537679
- Brandon Abbott, D.O.Kansas City, MO1356875702
- Ann Abbott Marin, DOArnold, MO1477132421
- Mohamed Abdalaziz, MDKansas City, MO1538578075
- Karam Abdelmasih, MD, APFestus, MO1093288508
- Afsheen Abdullah Patel, MDLees Summit, MO1598070377
- Christopher Abercrombie, DOArnold, MO1093787558
- Avery Abernathy, D.O.Kansas City, MO1013207836
- Kristia Abernathy, MDSaint Louis, MO1710545405
- Grant Abkemeier, DOColumbia, MO1922933712
Common questions
What is John J. O'Connor, M.D.'s NPI number?
John J. O'Connor, M.D.'s National Provider Identifier (NPI) is 1356392310, issued on May 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John J. O'Connor, M.D. located?
The NPPES record lists a practice address at 1002 Peruque Crossing CT, O Fallon, MO, 63366. Phone: (636) 294-5900. Providers update this record themselves, so call before visiting.
How can I verify John J. O'Connor, M.D.'s license?
NPPES lists Missouri license number 35988, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.