John J. O'Brien, DDS
General Practice Dentistry · Marshfield, WI
John J. O'Brien, DDS is a general practice dentistry with a practice address in Marshfield, Wisconsin, and NPI 1811208333, issued on Jun 30, 2010. Check the license (Wisconsin 6543, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John J. O'Brien
- Credential
- DDS
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- License number
- 6543 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1307 N Saint Joseph Ave, Marshfield, WI 54449
- Phone
- (715) 221-5600
- Enumerated
- Jun 30, 2010
- Record last updated
- Jun 10, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicaid ID
- APPR WI
- Entity
- Type 1 · individual
8 nearest general practice dentistry records → All 2,305 in Wisconsin → Look up another NPI →
Also registered at 1307 N Saint Joseph Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Aditi Bharatkumar, D.D.S.Dentist1164830014
- Melissa Goldberg, RNCase Management Registered Nurse1043874456
- Nicole KaiserPhysician Assistant1568028876
- Meredith Kean, PHARMDPharmacist1962123703
- Rebecca Kizewski, RPHPharmacist1528789369
- Deepak Neelagiri, DDSGeneral Practice Dentistry1093026791
Verify John J. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 6543Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% more Medicare Part D claims than the average general practice dentistry in 2024
130 Medicare Part D claims for 85 beneficiaries, against an average of 83 among the 70,290 providers of this specialty who prescribed in Part D. 13 claims were for opioids.
Most prescribed
- Amoxicillin76 claims
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.
John J. O'Brien among 2,305 general practice dentistry records in Wisconsin
John J. O'Brien, DDS is one of 2,305 general practice dentistry records with a practice address in Wisconsin. 57% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 65% of them.
- NPI issued2010 · 65% of these records are older, 34% newer
- In a Medicare fileYes · 57% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2013 · 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 Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
General Practice Dentistry providers in Wisconsin
There are 2,305 general practice dentistry records in Wisconsin.
All 2,305 in Wisconsin → Every provider in Marshfield → General Practice Dentistry nationwide →
The 8 general practice dentistry records with the nearest ZIP codes
- Reena Abraham, DMDMarshfield, WI 544491457589491
- Barry Cole, D.D.S.Marshfield, WI 544491316151210
- Brandyn Deitz, DDSMarshfield, WI 544491346176658
- Wesley DittmanMarshfield, WI 544491942906631
- David Mabeus, DDSMarshfield, WI 544491952432452
- Gary Martin, DDSMarshfield, WI 544491609970730
- Deepak Neelagiri, DDSMarshfield, WI 544491093026791
- Tiffany O'Brien, DDSMarshfield, WI 544491477878304
Common questions
What is John J. O'Brien, DDS's NPI number?
John J. O'Brien, DDS's National Provider Identifier (NPI) is 1811208333, issued on Jun 30, 2010. An NPI identifies a provider in billing; it is not a license.
Where is John J. O'Brien, DDS located?
The NPPES record lists a practice address at 1307 N Saint Joseph Ave, Marshfield, WI, 54449. Phone: (715) 221-5600. Providers update this record themselves, so call before visiting.
How can I verify John J. O'Brien, DDS's license?
NPPES lists Wisconsin license number 6543, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does John J. O'Brien, DDS prescribe under Medicare Part D?
In 2024, John J. O'Brien, DDS had 130 Medicare Part D claims for 85 beneficiaries; the average among general practice dentistry prescribers was 83. 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.