Jonathan S. Chien, M.D.
NPI 1558327270ActiveIndividual· Internal Medicine· Montebello, CA
Internal Medicine (M.D.) with Healthcare Partners Affiliates Medical Group, practicing in Montebello, California. Their prescriptions cost Medicare Part D more than their services did: $554,523 for 6,864 claims, against $7,005 paid for services in 2024. Pfizer Inc. reported $15.91 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1558327270 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 21, 2006 |
| Last updated in NPPES | Dec 8, 2025 |
| Certified by provider | Dec 8, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A50095 | CA |
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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 47 |
|---|---|
| Services billed | 99 across 16 procedure codes |
| Paid by Medicare | $7,005 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,864 · 17,774 30-day fills |
|---|---|
| Patients | 515 |
| Total drug cost | $554,523 |
| Generic share | 91% of claims |
Education and affiliations
| Graduation year | 1980 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Healthcare Partners Affiliates Medical GroupAnaheim, CA · 754 clinicians
Industry payments (Open Payments)
- 2025$15.91 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $15.91 | 1 |
What the 2025 payments were for
- Food and Beverage$15.91 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 35 internal medicine physicians in Montebello · All internal medicine physicians in California