John Andrew O'Brien, DDS
General Practice Dentistry · Rockford, IL
John Andrew O'Brien, DDS is a general practice dentistry with a practice address in Rockford, Illinois, and NPI 1629120209, issued on Jan 17, 2007. Check the license with the Illinois board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Andrew O'Brien
- Credential
- DDS
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- Practice location
- 5301 E State St, Rockford, IL 61108
- Phone
- (815) 399-2542
- Enumerated
- Jan 17, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest general practice dentistry records → All 5,276 in Illinois → Look up another NPI →
Also registered at 5301 E State St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Andrew O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Andrew O'Brien among 5,276 general practice dentistry records in Illinois
John Andrew O'Brien, DDS is one of 5,276 general practice dentistry records with a practice address in Illinois. 64% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 32% of them.
- NPI issued2007 · 32% of these records are older, 43% newer
- In a Medicare fileNo · 64% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2007 · 75% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223G0001X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
94 general practice dentistry records list a practice address in Rockford
They are 94 of the 3,893 NPPES records with a practice address in Rockford, and 5,276 general practice dentistry records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 5,276 in Illinois → Every provider in Rockford → General Practice Dentistry nationwide →
The 8 general practice dentistry records with the nearest ZIP codes
- Gary Anderson, D.D.S.Rockford, IL 611081861578882
- Ksenia Andronova, DDSRockford, IL 611081801948443
- Louis Antonacci, D.D.SRockford, IL 611081245274893
- Anthony Benassi, D.D.S.Rockford, IL 611081174676779
- Jon Conklin, DDSRockford, IL 611081619048741
- Kavitha Gowda, D.D.S.Rockford, IL 611081235292301
- David Johnson, D.D.S.Rockford, IL 611081225165889
- Yu-Jin Lee, D.M.D.Rockford, IL 611081427114875
Common questions
What is John Andrew O'Brien, DDS's NPI number?
John Andrew O'Brien, DDS's National Provider Identifier (NPI) is 1629120209, issued on Jan 17, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Andrew O'Brien, DDS located?
The NPPES record lists a practice address at 5301 E State St, Rockford, IL, 61108. Phone: (815) 399-2542. Providers update this record themselves, so call before visiting.
How can I verify John Andrew O'Brien, DDS's license?
Search the Illinois board that licenses this profession; the NPPES record confirms identity 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. 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.