Doris Tiu Tan, D.O.
NPI 1578522462ActiveIndividual· Psychiatry & Neurology, Psychiatry· Fresno, CA
Psychiatry & Neurology, Psychiatry (D.O.) in Fresno, California, trained at Ohio Medical University (class of 1987). Their prescriptions cost Medicare Part D more than their services did: $690,789 for 1,445 claims, against $18,941 paid for services in 2024. Teva Pharmaceuticals USA, Inc. was the largest of 8 companies reporting payments in 2025, $1,424 in all, mostly food and beverage.
Overview
| NPI | 1578522462 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Mar 21, 2006 |
| Last updated in NPPES | Jun 20, 2023 |
| Certified by provider | Jun 20, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Psychiatry Primary | 2084P0800X | 20A7928 | CA |
| Psychiatry & Neurology, Psychiatry | 2084P0800X | OS11210 | FL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Psychiatry (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 55 |
|---|---|
| Services billed | 219 across 5 procedure codes |
| Paid by Medicare | $18,941 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,445 · 1,528 30-day fills |
|---|---|
| Patients | 84 |
| Total drug cost | $690,789 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | Ohio Medical University |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Psychiatry |
Medical group
- Mental Health Systems IncOceanside, CA · 34 clinicians
Industry payments (Open Payments)
- 2025$1,424 · 53 payments from 8 companies
- 2024$767.34 · 25 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Teva Pharmaceuticals USA, Inc. | $390.59 | 8 |
| Alkermes, Inc. | $273.59 | 11 |
| Otsuka America Pharmaceutical, Inc. | $197.20 | 8 |
| Vanda Pharmaceuticals Inc. | $176.10 | 4 |
| Neurocrine Biosciences, Inc. | $165.17 | 16 |
What the 2025 payments were for
- Food and Beverage$1,313 · 52 payments
- Education$111.49 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 194 psychiatrists in Fresno · All psychiatrists in California