Kwan Toh Tan, M.D.
NPI 1013099746ActiveIndividual· Internal Medicine· La Palma, CA
Internal Medicine (M.D.) in La Palma, California, trained at Oral Roberts University School of Medicine (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $838,867 for 8,723 claims, against $91,180 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 20 companies reporting payments in 2025, $2,364 in all, mostly food and beverage.
Overview
| NPI | 1013099746 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Oct 20, 2006 |
| Last updated in NPPES | Jul 7, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G74232 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 354 |
|---|---|
| Services billed | 1,717 across 33 procedure codes |
| Paid by Medicare | $91,180 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,723 · 19,116 30-day fills |
|---|---|
| Patients | 699 |
| Total drug cost | $838,867 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Oral Roberts University School of Medicine |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Joshua International Medical GroupLa Palma, CA · 4 clinicians
Hospital affiliation
- Uci Health-OrangeOrange, CA
Industry payments (Open Payments)
- 2025$2,364 · 74 payments from 20 companies
- 2024$3,881 · 100 payments from 23 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $719.28 | 25 |
| Amgen Inc. | $330.18 | 11 |
| Novo Nordisk Inc | $200.78 | 8 |
| Glaxosmithkline, LLC. | $161.40 | 3 |
| Lilly USA, LLC | $144.09 | 3 |
What the 2025 payments were for
- Food and Beverage$2,364 · 74 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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