Jonathan Siu, D.O.
NPI 1346652179 · Family Medicine Physician · Claremont, CA
Jonathan Siu, D.O. is a Family Medicine Physician provider in Claremont, CA (NPI 1346652179).
Provider details
- NPI number
- 1346652179
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
12 yrs in NPPES registry
- Profile completeness33% of score
83% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 72 | 38 |
| Lisinopril | 38 | 20 |
| Amlodipine Besylate | 33 | 19 |
| Metformin Hcl | 31 | 15 |
| Simvastatin | 23 | — |
| Gabapentin | 21 | — |
| Semaglutidebrand: Ozempic | 20 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$19 across 1 record (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
- 2014-05-28
- Last updated
- 2021-12-06
- Certified
- 2020-07-06
Frequently asked questions
- What is Jonathan Siu's NPI number?
- Jonathan Siu's National Provider Identifier (NPI) is 1346652179, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jonathan Siu's specialty?
- Jonathan Siu is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Jonathan Siu located?
- Jonathan Siu's practice location on file with NPPES is 250 W San Jose Ave, Claremont, CA 91711-5207.
- What is Jonathan Siu's phone number?
- The practice phone number listed in the NPPES registry for Jonathan Siu is (888) 750-0036.
- Is Jonathan Siu's NPI active?
- Yes — Jonathan Siu's NPI (1346652179) is active in the NPPES registry as of the last update on 2021-12-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.