Oscar L. Chien, M.D.
NPI 1679675904ActiveIndividual· Internal Medicine, Geriatric Medicine· San Gabriel, CA
Internal Medicine, Geriatric Medicine (M.D.) in San Gabriel, California, licensed in CA, with an NPI issued in September 2006. Their prescriptions cost Medicare Part D more than their services did: $7,402,091 for 43,068 claims, against $387,988 paid for services in 2024. Sumitomo Pharma America, Inc. was the largest of 29 companies reporting payments in 2025, $13,874 in all, mostly speaking and faculty fees. Lists Garfield Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1679675904 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Sep 5, 2006 |
| Last updated in NPPES | Apr 2, 2020 |
| Certified by provider | Apr 2, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Geriatric Medicine Primary | 207RG0300X | A54999 | 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 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 681 |
|---|---|
| Services billed | 5,279 across 20 procedure codes |
| Paid by Medicare | $387,988 |
Part D prescriptions in 2024
| Prescriptions (claims) | 43,068 · 58,609 30-day fills |
|---|---|
| Patients | 1,086 |
| Total drug cost | $7,402,091 |
| Generic share | 77% of claims |
Education and affiliations
| Graduation year | 1990 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Geriatric Medicine |
Hospital affiliations
- Garfield Medical CenterMonterey Park, CA
- San Gabriel Valley Medical CenterSan Gabriel, CA
- Usc Arcadia HospitalArcadia, CA
Other facilities
- Goodwill Plus, IncHome health agency · Monterey Park, CA
- Happy Home Health ServicesHome health agency · Arcadia, CA
- Panda Home Healthcare, IncHome health agency · San Gabriel, CA
- The Best Care Ever Home Health, IncHome health agency · Van Nuys, CA
- Wise Home Health IncHome health agency · San Gabriel, CA
- Beta Hospice Care IncHospice · San Bernardino, CA
- Ivory Hospice & Palliative CareHospice · Monterey Park, CA
- Quality Care Hospice, IncHospice · West Covina, CA
- Alhambra Healthcare & Wellness Centre, LPNursing home · Alhambra, CA
- Arcadia Care CenterNursing home · Arcadia, CA
- Broadway Healthcare CenterNursing home · San Gabriel, CA
- Pine Grove Healthcare & Wellness Centre, LPNursing home · San Gabriel, CA
- Santa Anita Convalescent HospitalNursing home · Temple City, CA
Industry payments (Open Payments)
- 2025$13,874 · 132 payments from 29 companies
- 2024$27,480 · 157 payments from 25 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sumitomo Pharma America, Inc. | $5,016 | 12 |
| Abbvie Inc. | $2,449 | 12 |
| Vivus LLC | $1,440 | 5 |
| Phathom Pharmaceuticals, Inc. | $1,328 | 5 |
| Astrazeneca Pharmaceuticals LP | $647.81 | 23 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$6,730 · 5 payments
- Food and Beverage$4,315 · 121 payments
- Travel and Lodging$1,545 · 3 payments
- Consulting Fee$1,250 · 1 payment
- Education$33.35 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Geriatric Medicine providers in San Gabriel
- 1831361237
All Internal Medicine, Geriatric Medicine providers in California →