Gary R. O'Brien, D.D.S.
Dentist · Glendale, CA
Gary R. O'Brien, D.D.S. is a dentist with a practice address in Glendale, California, and NPI 1477729747, issued on May 6, 2008. Check the license (California 29639, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gary R. O'Brien
- Credential
- D.D.S.
- Primary taxonomy
- Dentist 122300000X
- License number
- 29639 CA
Self-reported in NPPES; status is on the state search - Practice location
- 411 N Central Ave, Glendale, CA 91203
- Phone
- (818) 956-0639
- Enumerated
- May 6, 2008
- Record last updated
- May 6, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (818) 246-1542
- Entity
- Type 1 · individual
8 nearest dentist records → All 14,729 in California → Look up another NPI →
Also registered at 411 N Central Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Melineha Arakelian, DDSDentist1114120458
- Stephen Goldman, DDSPeriodontics1508873167
- Tyler Hendry, D.D.S.Periodontics1285897660
- Koharik Janoyan, DDSDentist1720209919
- Mehrdad JoukarAcupuncturist1376963033
Verify Gary R. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 29639Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% fewer Medicare Part D claims than the average dentist in 2024
50 Medicare Part D claims for 27 beneficiaries, against an average of 86 among the 51,021 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 11 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass21 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.
Gary R. O'Brien among 14,729 dentist records in California
Gary R. O'Brien, D.D.S. is one of 14,729 dentist records with a practice address in California. 56% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 42% of them.
- NPI issued2008 · 42% of these records are older, 52% newer
- In a Medicare fileYes · 56% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2008 · 73% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 122300000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
117 dentist records list a practice address in Glendale
They are 117 of the 4,742 NPPES records with a practice address in Glendale, and 14,729 dentist records in California.
All 14,729 in California → Every provider in Glendale → Dentist nationwide →
The 8 dentist records with the nearest ZIP codes
- Melineha Arakelian, DDSGlendale, CA 912031114120458
- Bella Baydian, DDSGlendale, CA 912031164568093
- Ryan Candelora, DDSGlendale, CA 912031982707568
- Mark De Leon, DDSGlendale, CA 912031336279710
- Anna Hubler, DDSGlendale, CA 912031245415579
- Koharik Janoyan, DDSGlendale, CA 912031720209919
- Chi Leung, DDSGlendale, CA 912031053511519
- Rafik Meserkhani, D.D.SGlendale, CA 912031801004676
Common questions
What is Gary R. O'Brien, D.D.S.'s NPI number?
Gary R. O'Brien, D.D.S.'s National Provider Identifier (NPI) is 1477729747, issued on May 6, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Gary R. O'Brien, D.D.S. located?
The NPPES record lists a practice address at 411 N Central Ave, Glendale, CA, 91203. Phone: (818) 956-0639. Providers update this record themselves, so call before visiting.
How can I verify Gary R. O'Brien, D.D.S.'s license?
NPPES lists California license number 29639, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Gary R. O'Brien, D.D.S. prescribe under Medicare Part D?
In 2024, Gary R. O'Brien, D.D.S. had 50 Medicare Part D claims for 27 beneficiaries; the average among dentist prescribers was 86. 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.