Gregory Garabed Simsarian, M.D
Emergency Medicine Physician · Laguna Hills, CA
Gregory Garabed Simsarian, M.D is an emergency medicine physician with a practice address in Laguna Hills, California, and NPI 1144250713, issued on Jul 3, 2006. Check the license (California G65647, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory Garabed Simsarian
- Credential
- M.D
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- G65647 CA
Self-reported in NPPES; status is on the state search - Practice location
- 24451 Health Center Dr, Laguna Hills, CA 92653
- Phone
- (714) 837-4500
- Enumerated
- Jul 3, 2006
- Record last updated
- Feb 6, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 00G656470 CA
- Medicare enrollment
- Enrolled (PECOS I20100331000014); accepts Medicare assignment
- Medical or professional school
- Un Of California, Irvine, College Of Medicine, 1986
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 24451 Health Center Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jessica Alva, R.N.F.A.Registered Nurse First Assistant1265848733
- Jordan Amato, PHARMDPharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1154279511
- Dwight Arakaki, M.DEmergency Medicine Physician1376653360
- Saryna Bahadarakhann, RNRegistered Nurse1861775116
- Joshua Bobko, MDEmergency Medicine Physician1235397621
- Brianna Brown, LCSWClinical Social Worker1144982000
Verify Gregory Garabed Simsarian in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G65647Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% fewer Medicare Part D claims than the average emergency medicine physician in 2024
218 Medicare Part D claims for 172 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 44 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen20 claims
- Oxycodone-Acetaminophen20 claims
- Ondansetron Odt18 claims
- Cephalexin14 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 94.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Cep America - CaliforniaLaguna Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Garabed Simsarian among 7,751 emergency medicine physician records in California
Gregory Garabed Simsarian, M.D is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1986 · median 2011 among the 4,560 with a school on file
- Record last updated2008 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Laguna Hills → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Dwight Arakaki, M.DLaguna Hills, CA 926531376653360
- Joshua Bobko, MDLaguna Hills, CA 926531235397621
- Randall Chong, M.DLaguna Hills, CA 926531124056387
- William Fields, M.DLaguna Hills, CA 926531699703801
- Edward Mescher, M.DLaguna Hills, CA 926531942246897
- Jennifer Newton, MDLaguna Hills, CA 926531053377697
- Martin Ogle, M.DLaguna Hills, CA 926531407884505
- Mark Reynolds, M.D.Laguna Hills, CA 926531831124577
Common questions
What is Gregory Garabed Simsarian, M.D's NPI number?
Gregory Garabed Simsarian, M.D's National Provider Identifier (NPI) is 1144250713, issued on Jul 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Garabed Simsarian, M.D located?
The NPPES record lists a practice address at 24451 Health Center Dr, Laguna Hills, CA, 92653. Phone: (714) 837-4500. Providers update this record themselves, so call before visiting.
How can I verify Gregory Garabed Simsarian, M.D's license?
NPPES lists California license number G65647, 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 Gregory Garabed Simsarian, M.D prescribe under Medicare Part D?
In 2024, Gregory Garabed Simsarian, M.D had 218 Medicare Part D claims for 172 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Gregory Garabed Simsarian, M.D's MIPS final score?
The 2023 MIPS final score is 94.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.