Internal Medicine in Ontario, CA
9 verified internal medicine doctors in Ontario.
Internists specialize in the prevention, diagnosis, and treatment of adult diseases, often coordinating complex or chronic conditions across multiple systems.
NPPES tenure ≠ clinical experience. "Years on NPPES" is time since the physician first registered a National Provider Identifier, not time practicing medicine. Verify current license status with the state medical board.
Dr. Eric Gureghian, MD
Internal Medicine
CMS Open Payments· No payments in 2023
Industry Payments
No industry payments on record in the 2023 CMS Open Payments data. This doctor received no reported payments from drug or device makers that year.
Dr. Liwanag Asuncion, MD
Internal Medicine
CMS Open Payments· No payments in 2023
Industry Payments
No industry payments on record in the 2023 CMS Open Payments data. This doctor received no reported payments from drug or device makers that year.
Dr. David Hirota, MD
Internal Medicine
CMS Open Payments· No payments in 2023
Industry Payments
No industry payments on record in the 2023 CMS Open Payments data. This doctor received no reported payments from drug or device makers that year.
Dr. Yan Zhang, MD
Internal Medicine
CMS Open Payments· No payments in 2023
Industry Payments
No industry payments on record in the 2023 CMS Open Payments data. This doctor received no reported payments from drug or device makers that year.
Dr. Kishan Thapar, MD
Internal Medicine
CMS Open Payments· $141.93 (2023)
Industry Payments (2023)
Reported by drug and device makers to CMS Open Payments. These payments are legal and disclosed — shown as context, not a judgment.
$141.93
Total received
1
Transactions
1
Paying companies
Top paying companies
Among the 183,896 internal medicine doctors we've analyzed, about 37% received any industry payment (median $195 among those who did). This doctor's total ranks around the 79th percentile of that group.
Benchmark reflects doctors we've analyzed, not all US internal medicine doctors.
Payments to Kishan Thapar do not imply any wrongdoing. Many are meals, education, or research support.
Dr. David Daniels, MD
Internal Medicine
CMS Open Payments· $38.46 (2023)
Industry Payments (2023)
Reported by drug and device makers to CMS Open Payments. These payments are legal and disclosed — shown as context, not a judgment.
$38.46
Total received
2
Transactions
1
Paying companies
Top paying companies
Among the 183,896 internal medicine doctors we've analyzed, about 37% received any industry payment (median $195 among those who did). This doctor's total ranks around the 70th percentile of that group.
Benchmark reflects doctors we've analyzed, not all US internal medicine doctors.
Payments to David Daniels do not imply any wrongdoing. Many are meals, education, or research support.
Dr. Tsung Tsai, MD
Internal Medicine
CMS Open Payments· No payments in 2023
Industry Payments
No industry payments on record in the 2023 CMS Open Payments data. This doctor received no reported payments from drug or device makers that year.
Dr. Rodman St. Clair, MD
Internal Medicine
CMS Open Payments· No payments in 2023
Industry Payments
No industry payments on record in the 2023 CMS Open Payments data. This doctor received no reported payments from drug or device makers that year.
Dr. Sujay Dayal, MD
Internal Medicine
CMS Open Payments· $16.38 (2023)
Industry Payments (2023)
Reported by drug and device makers to CMS Open Payments. These payments are legal and disclosed — shown as context, not a judgment.
$16.38
Total received
1
Transactions
1
Paying companies
Top paying companies
Among the 183,896 internal medicine doctors we've analyzed, about 37% received any industry payment (median $195 among those who did). This doctor's total ranks around the 65th percentile of that group.
Benchmark reflects doctors we've analyzed, not all US internal medicine doctors.
Payments to Sujay Dayal do not imply any wrongdoing. Many are meals, education, or research support.