Michelle Ong, M.D.
NPI 1871671594 · Internal Medicine Physician · Orinda, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michelle Ong, M.D. is a Internal Medicine Physician provider in Orinda, CA (NPI 1871671594).
Provider details
- NPI number
- 1871671594
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A67566 (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 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 45 | — |
| Amlodipine Besylate | 39 | 11 |
| Losartan Potassium | 23 | — |
| Simvastatin | 21 | — |
| Mirtazapine | 16 | — |
| Pravastatin Sodium | 13 | — |
| Pantoprazole Sodium | 13 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2011-03-10
Frequently asked questions
- What is Michelle Ong's NPI number?
- Michelle Ong's National Provider Identifier (NPI) is 1871671594, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michelle Ong's specialty?
- Michelle Ong is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michelle Ong located?
- Michelle Ong's practice location on file with NPPES is 140 Brookwood Rd, Orinda, CA 94563-3042.
- What is Michelle Ong's phone number?
- The practice phone number listed in the NPPES registry for Michelle Ong is (925) 254-9090.
- Does Michelle Ong accept Medicare?
- Michelle Ong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michelle Ong's NPI active?
- Yes — Michelle Ong's NPI (1871671594) is active in the NPPES registry as of the last update on 2011-03-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.