Michael Peter Koumjian, MD
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · La Mesa, CA
Michael Peter Koumjian, MD is a thoracic surgery (cardiothoracic vascular surgery) physician with a practice address in La Mesa, California, and NPI 1366403321, issued on Mar 30, 2006. Check the license (California G37886, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Peter Koumjian
- Credential
- MD
- Primary taxonomy
- Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician 208G00000X
- License number
- G37886 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5525 Grossmont Center Dr, La Mesa, CA 91942
- Phone
- (619) 466-5700
- Enumerated
- Mar 30, 2006
- Record last updated
- Feb 2, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (619) 460-8975
- Medicaid ID
- GR0066270 CA
- Medicare enrollment
- Enrolled (PECOS I20060301000763); accepts Medicare assignment
- Medical or professional school
- Rutgers New Jersey Medical School, 1977
- Entity
- Type 1 · individual
8 nearest thoracic surgery (cardiothoracic vascular surgery) physician records → All 634 in California → Look up another NPI →
Also registered at 5525 Grossmont Center Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Cynthia Adams, PA-CMedical Physician Assistant1447564141
- Alicia Afrah-Boateng, PA-CPhysician Assistant1174073886
- Sonal Agrawal, M.D.Pediatrics Physician1881702348
- Mary Alexander, M.D.Internal Medicine Physician1538177845
- James Amberg, MDFamily Medicine Physician1265497093
Verify Michael Peter Koumjian in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G37886Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
27% fewer Medicare Part D claims than the average thoracic surgery (cardiothoracic vascular surgery) physician in 2024
74 Medicare Part D claims for 35 beneficiaries, against an average of 101 among the 2,587 providers of this specialty who prescribed in Part D. 30 claims were for opioids.
Most prescribed
- Enoxaparin Sodium15 claims
- Oxycodone-Acetaminophen13 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.
Industry payments in 2024: $3,230.16
46 payments; by number, the most common kind was food and beverage; the largest payer was Abiomed. The 4,047 providers of this specialty with any payment received $7,828.84 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- ON Call Specialists Medical Group OF San Diego IncChula Vista, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Peter Koumjian among 634 thoracic surgery (cardiothoracic vascular surgery) physician records in California
Michael Peter Koumjian, MD is one of 634 thoracic surgery (cardiothoracic vascular surgery) physician records with a practice address in California. 75% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 45% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1977 · median 1997 among the 408 with a school on file
- Record last updated2018 · 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 208G00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers in California
There are 634 thoracic surgery (cardiothoracic vascular surgery) physician records in California.
All 634 in California → Every provider in La Mesa → Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician nationwide →
The 8 thoracic surgery (cardiothoracic vascular surgery) physician records with the nearest ZIP codes
- Hugo Gomez-Engler, M.D.La Mesa, CA 919421144508995
- Frantz Derenoncourt, MDNational City, CA 919501194736884
- Jose Hernandez, M.D.Chula Vista, CA 919111477838779
- Alexandra KharaziChula Vista, CA 919101962704734
- Albert Macksood, M.D.Carlsbad, CA 920101184861171
- Robert Reichman, MDEscondido, CA 920251902879505
- Julie Swain, M.D.Fallbrook, CA 920281295816171
- Jeffrey RosenburgEscondido, CA 920291972576189
Common questions
What is Michael Peter Koumjian, MD's NPI number?
Michael Peter Koumjian, MD's National Provider Identifier (NPI) is 1366403321, issued on Mar 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael Peter Koumjian, MD located?
The NPPES record lists a practice address at 5525 Grossmont Center Dr, La Mesa, CA, 91942. Phone: (619) 466-5700. Providers update this record themselves, so call before visiting.
How can I verify Michael Peter Koumjian, MD's license?
NPPES lists California license number G37886, 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 Michael Peter Koumjian, MD prescribe under Medicare Part D?
In 2024, Michael Peter Koumjian, MD had 74 Medicare Part D claims for 35 beneficiaries; the average among thoracic surgery (cardiothoracic vascular surgery) physician prescribers was 101. 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.