Oliver Lim Ong, M.D.
NPI 1811951734ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Glendale, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) in Glendale, California, trained at George Washington University School of Medicine (class of 1996). Their prescriptions cost Medicare Part D more than their services did: $4,163,006 for 10,703 claims, against $115,712 paid for services in 2024. Boehringer Ingelheim Pharmaceuticals, Inc. was the largest of 28 companies reporting payments in 2025, $2,347 in all, mostly food and beverage.
Overview
| NPI | 1811951734 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 17, 2006 |
| Last updated in NPPES | Jul 11, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | A76526 | 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 - Endocrinology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 650 |
|---|---|
| Services billed | 1,459 across 14 procedure codes |
| Paid by Medicare | $115,712 |
Part D prescriptions in 2024
| Prescriptions (claims) | 10,703 · 19,475 30-day fills |
|---|---|
| Patients | 812 |
| Total drug cost | $4,163,006 |
| Generic share | 39% of claims |
Education and affiliations
| Medical school | George Washington University School of Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
Medical group
- Adventist Health Physicians NetworkSaint Helena, CA · 628 clinicians
Hospital affiliations
- Adventist Health Simi ValleySimi Valley, CA
- Glendale Adventist Medical CenterGlendale, CA
- Usc Verdugo Hills HospitalGlendale, CA
Industry payments (Open Payments)
- 2025$2,347 · 102 payments from 28 companies
- 2024$2,398 · 117 payments from 24 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Boehringer Ingelheim Pharmaceuticals, Inc. | $257.46 | 12 |
| Novo Nordisk Inc | $228.87 | 11 |
| Amgen Inc. | $199.70 | 14 |
| Dexcom, Inc. | $172.66 | 8 |
| Verity Pharmaceuticals Inc. | $139.18 | 4 |
What the 2025 payments were for
- Food and Beverage$2,347 · 102 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 15 endocrinologists in Glendale · All endocrinologists in California