Razmik Thomassian, M.D.
Internal Medicine Physician · Duarte, CA
Razmik Thomassian, M.D. is an internal medicine physician with a practice address in Duarte, California, and NPI 1518351733, issued on Mar 25, 2015. Check the license (California A152242, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Razmik Thomassian
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A152242 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1227 Buena Vista St Ste F, Duarte, CA 91010
- Phone
- (877) 254-4496
- Enumerated
- Mar 25, 2015
- Record last updated
- Dec 19, 2022
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1227 Buena Vista St Ste F
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jennifer Dong, MS, L.ACPhysician Assistant1215442207
Verify Razmik Thomassian in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A152242Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average internal medicine physician in 2024
193 Medicare Part D claims for 70 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Celecoxib13 claims
- Quetiapine Fumarate13 claims
- Azithromycin11 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.
Razmik Thomassian among 17,696 internal medicine physician records in California
Razmik Thomassian, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 76% of them.
- NPI issued2015 · 76% of these records are older, 21% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2022 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in California
There are 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Duarte → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Karam Ashouri, MDDuarte, CA 910101518616200
- Houman Badrzadeh, DODuarte, CA 910101295380517
- Stan Mathioulakis, MDDuarte, CA 910101912080847
- Ulin Sargeant, M.D., MPHDuarte, CA 910101992878151
- Tyler Seto, M.D.Duarte, CA 910101669579579
- Indravadan Shah, MDDuarte, CA 910101932126497
- Koral Shah, MDDuarte, CA 910101124672613
- Mohammed Siddiqui, MDDuarte, CA 910101861056251
Common questions
What is Razmik Thomassian, M.D.'s NPI number?
Razmik Thomassian, M.D.'s National Provider Identifier (NPI) is 1518351733, issued on Mar 25, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Razmik Thomassian, M.D. located?
The NPPES record lists a practice address at 1227 Buena Vista St Ste F, Duarte, CA, 91010. Phone: (877) 254-4496. Providers update this record themselves, so call before visiting.
How can I verify Razmik Thomassian, M.D.'s license?
NPPES lists California license number A152242, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Razmik Thomassian, M.D. prescribe under Medicare Part D?
In 2024, Razmik Thomassian, M.D. had 193 Medicare Part D claims for 70 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.