Roger Ong, MD
NPI 1881761799 · Internal Medicine Physician · Harbor City, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Roger Ong, MD is a Internal Medicine Physician provider in Harbor City, CA (NPI 1881761799).
Provider details
- NPI number
- 1881761799
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G80076 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 89 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 430 | 199 |
| Lisinopril | 277 | 115 |
| Amlodipine Besylate | 263 | 132 |
| Losartan Potassium | 230 | 96 |
| Hydrochlorothiazide | 173 | 65 |
| Levothyroxine Sodium | 171 | 80 |
| Simvastatin | 156 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-29
- Last updated
- 2021-11-30
Frequently asked questions
- What is Roger Ong's NPI number?
- Roger Ong's National Provider Identifier (NPI) is 1881761799, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Roger Ong's specialty?
- Roger Ong is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Roger Ong located?
- Roger Ong's practice location on file with NPPES is 25825 Vermont Ave, Harbor City, CA 90710-3518.
- What is Roger Ong's phone number?
- The practice phone number listed in the NPPES registry for Roger Ong is (310) 325-5111.
- Does Roger Ong accept Medicare?
- Roger Ong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Roger Ong's NPI active?
- Yes — Roger Ong's NPI (1881761799) is active in the NPPES registry as of the last update on 2021-11-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.