NPPES file of Aug 9, 2026

Gianmarco O'Brien, D.D.S.

Prosthodontics · Orange, CA

Gianmarco O'Brien, D.D.S. is a prosthodontics with a practice address in Orange, California, and NPI 1336338847, issued on Oct 20, 2007. Check the license (California 51630, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1336338847
Name
Gianmarco O'Brien
Credential
D.D.S.
Primary taxonomy
Prosthodontics 1223P0700X
License number
51630 CA
Self-reported in NPPES; status is on the state search
Practice location
1140 W LA Veta Ave, Orange, CA 92868
Phone
(714) 953-1000
Enumerated
Oct 20, 2007
Record last updated
Nov 8, 2010 (not updated in 16 years: call before relying on the address or phone)
Fax
(714) 953-9957
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest prosthodontics records → All 474 in California → Look up another NPI →

Also registered at 1140 W LA Veta Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Edwin Alexander, M.D.Internal Medicine Physician1659315752
  2. Faramarz Alizadeh-Shabdiz, M.DOtolaryngology Physician1790955052
  3. Navin Amin, M.D.Otolaryngology Physician1851390314
  4. Shruti Ariza, MDGastroenterology Physician1962657023
  5. Jeffrey Ballard, M.D.Vascular Surgery Physician1205837200
  6. Anjan Batra, MDPediatric Cardiology Physician1558453258

Verify Gianmarco O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 51630    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Industry payments in 2024: $1,717.51

6 payments; by number, the most common kind was food and beverage; the largest payer was Kuraray America Inc. The 1,408 providers of this specialty with any payment received $3,465.28 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Gianmarco O'Brien$1,717.51
  2. Specialty average$3,465.28

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Gianmarco O'Brien among 474 prosthodontics records in California

Gianmarco O'Brien, D.D.S. is one of 474 prosthodontics records with a practice address in California. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 25% of them.

  • NPI issued2007 · 25% of these records are older, 45% newer
  • In a Medicare fileYes · 61% of these records are
  • In the CMS Doctors and Clinicians fileNo · 3% of these records are
  • Record last updated2010 · 80% 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 California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Prosthodontics providers in California

There are 474 prosthodontics records in California.

All 474 in California → Every provider in Orange → Prosthodontics nationwide →

The 8 prosthodontics records with the nearest ZIP codes

  1. Mark George, D.D.S.Orange, CA 928681225031735
  2. David Guichet, D.D.S.Orange, CA 928681831262120
  3. Gregory Guichet, D.D.S.Orange, CA 928681437222718
  4. Zahra Hashemi, D.D.S., M.S.Orange, CA 928681093904732
  5. Carlos Munoz, DDSOrange, CA 928691649294422
  6. Anthony Gabriel, D.M.D.Norco, CA 928601700294766
  7. Gregory Kuwabara, D.D.S.Yorba Linda, CA 928861902026586
  8. Dinh Vo, DDS.Garden Grove, CA 928401528280252

Common questions

What is Gianmarco O'Brien, D.D.S.'s NPI number?

Gianmarco O'Brien, D.D.S.'s National Provider Identifier (NPI) is 1336338847, issued on Oct 20, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Gianmarco O'Brien, D.D.S. located?

The NPPES record lists a practice address at 1140 W LA Veta Ave, Orange, CA, 92868. Phone: (714) 953-1000. Providers update this record themselves, so call before visiting.

How can I verify Gianmarco O'Brien, D.D.S.'s license?

NPPES lists California license number 51630, as entered by the provider. Search the California 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. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.