Karen Tsai, M.D.
NPI 1265973416ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Duarte, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) with City of Hope Medical Foundation, practicing in Duarte, California. Their prescriptions cost Medicare Part D more than their services did: $652,730 for 2,118 claims, against $120,377 paid for services in 2024. Novo Nordisk Inc was the largest of 2 companies reporting payments in 2025, $438.24 in all, mostly food and beverage. Lists San Antonio Regional Hospital as a hospital affiliation.
Overview
| NPI | 1265973416 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Mar 20, 2017 |
| Last updated in NPPES | Nov 14, 2024 |
| Certified by provider | Nov 14, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | A157548 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 548 |
|---|---|
| Services billed | 2,000 across 17 procedure codes |
| Paid by Medicare | $120,377 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,118 · 4,993 30-day fills |
|---|---|
| Patients | 313 |
| Total drug cost | $652,730 |
| Generic share | 61% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- City of Hope Medical FoundationDuarte, CA · 982 clinicians
Hospital affiliation
- San Antonio Regional HospitalUpland, CA
Industry payments (Open Payments)
- 2025$438.24 · 7 payments from 2 companies
- 2024$114.74 · 5 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $364.99 | 3 |
| Dexcom, Inc. | $73.25 | 4 |
What the 2025 payments were for
- Food and Beverage$438.24 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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