William Joseph O'Brien, DDS
Prosthodontics · Milwaukee, WI
William Joseph O'Brien, DDS is a prosthodontics with a practice address in Milwaukee, Wisconsin, and NPI 1285657957, issued on Jul 25, 2006. Check the license (Wisconsin 4279 - 15, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Joseph O'Brien
- Credential
- DDS
- Primary taxonomy
- Prosthodontics 1223P0700X
- License number
- 4279 - 15 WI
Self-reported in NPPES; status is on the state search - Practice location
- 5900 N Port Washington RD, Milwaukee, WI 53217
- Phone
- (414) 332-7450
- Enumerated
- Jul 25, 2006
- 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 prosthodontics records → All 67 in Wisconsin → Look up another NPI →
Verify William Joseph 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 4279 - 15Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% fewer Medicare Part D claims than the average prosthodontics in 2024
73 Medicare Part D claims for 44 beneficiaries, against an average of 90 among the 1,779 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Amoxicillin31 claims
- Sodium Fluoride17 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.
William Joseph O'Brien among 67 prosthodontics records in Wisconsin
William Joseph O'Brien, DDS is one of 67 prosthodontics records with a practice address in Wisconsin. 45% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 55% newer
- In a Medicare fileYes · 45% of these records are
- In the CMS Doctors and Clinicians fileNo · 3% of these records are
- Record last updated2007 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223P0700X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Prosthodontics providers in Wisconsin
There are 67 prosthodontics records in Wisconsin.
All 67 in Wisconsin → Every provider in Milwaukee → Prosthodontics nationwide →
The 8 prosthodontics records with the nearest ZIP codes
- David Lubar, D.D.S.Milwaukee, WI 532171710061080
- James Podnar, DDSWauwatosa, WI 532221568488641
- George Rooney, DDSWauwatosa, WI 532221265451744
- Daniel Moos, DDSMilwaukee, WI 532111386790921
- David Kachelmeyer, D.D.S.Milwaukee, WI 532091912143439
- Geoffrey Heinrich, D.D.S.Wauwatosa, WI 532261720133853
- Mark Boldt, DDSWest Allis, WI 532271831291996
- Barry Franzen, D.D.S.West Allis, WI 532271225077910
Common questions
What is William Joseph O'Brien, DDS's NPI number?
William Joseph O'Brien, DDS's National Provider Identifier (NPI) is 1285657957, issued on Jul 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Joseph O'Brien, DDS located?
The NPPES record lists a practice address at 5900 N Port Washington RD, Milwaukee, WI, 53217. Phone: (414) 332-7450. Providers update this record themselves, so call before visiting.
How can I verify William Joseph O'Brien, DDS's license?
NPPES lists Wisconsin license number 4279 - 15, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does William Joseph O'Brien, DDS prescribe under Medicare Part D?
In 2024, William Joseph O'Brien, DDS had 73 Medicare Part D claims for 44 beneficiaries; the average among prosthodontics prescribers was 90. 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.