Stephen Chen, M.D.
NPI 1265601553 · Internal Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Chen, M.D. is a Internal Medicine Physician provider in Oakland, CA (NPI 1265601553).
Provider details
- NPI number
- 1265601553
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A102205 (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
18 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 · 18 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 119 | 49 |
| Oxycodone Hclbrand: Oxycontin | 99 | 21 |
| Dexamethasone | 76 | 43 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 63 | 25 |
| Trazodone Hcl | 62 | 39 |
| Oxycodone Hcl | 55 | 16 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-02-21
- Last updated
- 2021-12-20
Frequently asked questions
- What is Stephen Chen's NPI number?
- Stephen Chen's National Provider Identifier (NPI) is 1265601553, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Chen's specialty?
- Stephen Chen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Chen located?
- Stephen Chen's practice location on file with NPPES is 1800 Harrison St, Oakland, CA 94612-3466.
- What is Stephen Chen's phone number?
- The practice phone number listed in the NPPES registry for Stephen Chen is (510) 625-6262.
- Does Stephen Chen accept Medicare?
- Stephen Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Chen's NPI active?
- Yes — Stephen Chen's NPI (1265601553) is active in the NPPES registry as of the last update on 2021-12-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.