William O'Brien, DDS
NPI 1285657957 · Prosthodontics · Milwaukee, WI
William O'Brien, DDS is a Prosthodontics provider in Milwaukee, WI (NPI 1285657957).
Provider details
- NPI number
- 1285657957
- Entity type
- Individual
- Primary specialty
- ProsthodonticsDental Providers
- Credential
- DDS
- Sex
- Male
- Sole proprietor
- No
- License
- 4279 - 15 (WI)
Specialties & taxonomies
Dental Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin | 31 | 23 |
| Fluoride (sodium)brand: Sodium Fluoride | 17 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-25
- Last updated
- 2007-07-08
Frequently asked questions
- What is William O'Brien's NPI number?
- William O'Brien's National Provider Identifier (NPI) is 1285657957, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William O'Brien's specialty?
- William O'Brien is listed in the NPPES registry with a primary specialty of Prosthodontics (Dental Providers).
- Where is William O'Brien located?
- William O'Brien's practice location on file with NPPES is 5900 N Port Washington Rd, Milwaukee, WI 53217-4503.
- What is William O'Brien's phone number?
- The practice phone number listed in the NPPES registry for William O'Brien is (414) 332-7450.
- Is William O'Brien's NPI active?
- Yes — William O'Brien's NPI (1285657957) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.