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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John J O'Connor, M.D.

Family Medicine Physician in O Fallon, MO · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1356392310

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Registry record

Entity type Individual (Type 1)
Name Dr. John J O'Connor
Credential M.D.
Sex Male
Practice address 1002 Peruque Crossing Ct, Suite 101, O Fallon, MO, 63366
Phone (636) 294-5900
Fax (636) 294-5908
Enumeration date May 15, 2006
Last updated in NPPES Nov 13, 2014

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 35988 (MO) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
11310762 Other - CAQH
MA1721004 Other MO MEDICARE PTAN

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify John O'Connor's NPI record?
Cross-check NPI 1356392310 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1356392310 active?
Yes, as of the latest NPPES snapshot, NPI 1356392310 is active (record last updated 2014-11-13).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-11-13.