Gianmarco O'Brien, D.D.S.
NPI 1336338847 · Prosthodontics · Orange, CA
Gianmarco O'Brien, D.D.S. is a Prosthodontics provider in Orange, CA (NPI 1336338847).
Provider details
- NPI number
- 1336338847
- Entity type
- Individual
- Primary specialty
- ProsthodonticsDental Providers
- Credential
- D.D.S.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 51630 (CA)
Specialties & taxonomies
Dental Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
18 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,718 across 6 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-10-20
- Last updated
- 2010-11-08
Frequently asked questions
- What is Gianmarco O'Brien's NPI number?
- Gianmarco O'Brien's National Provider Identifier (NPI) is 1336338847, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gianmarco O'Brien's specialty?
- Gianmarco O'Brien is listed in the NPPES registry with a primary specialty of Prosthodontics (Dental Providers).
- Where is Gianmarco O'Brien located?
- Gianmarco O'Brien's practice location on file with NPPES is 1140 W La Veta Ave, Orange, CA 92868-4223.
- What is Gianmarco O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Gianmarco O'Brien is (714) 953-1000.
- Is Gianmarco O'Brien's NPI active?
- Yes — Gianmarco O'Brien's NPI (1336338847) is active in the NPPES registry as of the last update on 2010-11-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.