Dr. Michael Peter Koumjian, MD

Dr. Koumjian practices at Loma Linda University Medical Center - Murrieta in Murrieta, California, part of Seventh-day Adventist Church.

Dr. Koumjian's NPI, 1366403321, was assigned on March 30, 2006. Dr. Koumjian graduated from Rutgers New Jersey Medical School in 1977. Dr. Koumjian holds California license G37886.

Dr. Koumjian's primary practice is Loma Linda University Medical Center - Murrieta, at 28062 Baxter Road, Murrieta, CA 92563 in Riverside County. The practice phone is (951) 290-4000.

Dr. Koumjian's primary practice is Loma Linda University Medical Center - Murrieta in Murrieta, California, part of Seventh-day Adventist Church. Dr. Koumjian is also affiliated with Southwest Healthcare Rancho Springs Hospital. The medical group on file is Scripps Clinic Medical Group. Dmand AI also links Dr. Koumjian to 2 more hospitals, 3 group practices and clinics, 3 medical groups and 1 physician office, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Koumjian practices, 8 sites in all. Vendor and product names are available with a free account.

Thoracic surgery (cardiothoracic vascular surgery) is Dr. Koumjian's primary specialty in the NPI Registry, under taxonomy code 208G00000X. Dr. Koumjian is board certified in thoracic and cardiac surgery by the American Board of Thoracic Surgery. Dmand AI has Dr. Koumjian's licenses on file in 5 states: California, Oregon, Florida, Tennessee and Washington.

Dmand AI lists heart bypass surgery, heart device and aorta surgery, heart valve surgery and lung resection among the conditions Dr. Koumjian treats.

CMS data shows 891 Medicare services from Dr. Koumjian across 12 procedure codes in 2024, for 131 Medicare patients. Medicare paid $65,565 for them.

CMS counts 131 Medicare patients who saw Dr. Koumjian in 2024. The largest group is 65 to 74, with 53 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 30% are also on Medicaid. Their average risk score is 2.53, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Koumjian's median patient age at 72, with 41% women.

In 2024, Dr. Koumjian wrote 74 Medicare Part D claims for 35 patients. 99% of them were for generic drugs. CMS names the drug for 28 of them, across 2 drugs with 11 or more claims each, at $812 in total drug cost. In 2023, CMS named 12 claims across 1 drug.

Dr. Koumjian accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 12 procedures of coronary artery bypass graft (cabg) by Dr. Koumjian, more than 47% of the clinicians it reports for that procedure.

Leg revascularization (restoring blood flow): 1 to 10 procedures (CMS shows small counts as a range)

Melanoma (skin cancer) excision: 1 to 10 procedures (CMS shows small counts as a range)

Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)

CMS Open Payments shows 409 general payments to Dr. Koumjian from 52 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 58% of the total. Medtronic, Inc. paid the most, $10,743.

Dmand AI lists 1 award for Dr. Koumjian.

Dr. Koumjian graduated from Rutgers New Jersey Medical School in 1977. Dr. Koumjian is a member of ACS.

Dr. Koumjian is in network with 14 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.