Iun-Iu Chen, D.O.
NPI 1114288412 · Family Medicine Physician · Petaluma, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Iun-Iu Chen, D.O. is a Family Medicine Physician provider in Petaluma, CA (NPI 1114288412).
Provider details
- NPI number
- 1114288412
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- No
- License
- 252070 (MA)
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
14 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 · 40 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 91 | 28 |
| Lisinopril | 75 | 22 |
| Atorvastatin Calcium | 75 | 28 |
| Amlodipine Besylate | 62 | 17 |
| Omeprazole | 43 | 15 |
| Losartan Potassium | 42 | 12 |
| Metformin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-06-04
- Last updated
- 2025-07-01
- Certified
- 2025-07-01
Frequently asked questions
- What is Iun-Iu Chen's NPI number?
- Iun-Iu Chen's National Provider Identifier (NPI) is 1114288412, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Iun-Iu Chen's specialty?
- Iun-Iu Chen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Iun-Iu Chen located?
- Iun-Iu Chen's practice location on file with NPPES is 1179 N Mcdowell Blvd, Petaluma, CA 94954-0002.
- What is Iun-Iu Chen's phone number?
- The practice phone number listed in the NPPES registry for Iun-Iu Chen is (707) 559-7500.
- Does Iun-Iu Chen accept Medicare?
- Iun-Iu Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Iun-Iu Chen's NPI active?
- Yes — Iun-Iu Chen's NPI (1114288412) is active in the NPPES registry as of the last update on 2025-07-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.