Oliver Ong, M.D.
NPI 1811951734 · Endocrinology, Diabetes & Metabolism Physician · Glendale, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Oliver Ong, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in Glendale, CA (NPI 1811951734).
Provider details
- NPI number
- 1811951734
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A76526 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,417 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 697 | $144 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 457 | $53 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 85 | $186 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 80 | $140 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 45 | $87 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 88 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Empagliflozinbrand: Jardiance | 1,177 | 239 |
| Levothyroxine Sodium | 1,086 | 221 |
| Metformin Hcl | 1,058 | 258 |
| Tirzepatidebrand: Mounjaro | 651 | 102 |
| Semaglutidebrand: Ozempic | 443 | 74 |
| Insulin Glargine,hum.rec.anlogbrand: Lantus Solostar | 405 | 107 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,398 across 117 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-17
- Last updated
- 2012-07-11
Frequently asked questions
- What is Oliver Ong's NPI number?
- Oliver Ong's National Provider Identifier (NPI) is 1811951734, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Oliver Ong's specialty?
- Oliver Ong is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Oliver Ong located?
- Oliver Ong's practice location on file with NPPES is 801 S Chevy Chase Dr, Glendale, CA 91205-4431.
- What is Oliver Ong's phone number?
- The practice phone number listed in the NPPES registry for Oliver Ong is (818) 265-2242.
- Does Oliver Ong accept Medicare?
- Oliver Ong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Oliver Ong's NPI active?
- Yes — Oliver Ong's NPI (1811951734) is active in the NPPES registry as of the last update on 2012-07-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.