Win Chang, M.D.
NPI 1780827196 · Internal Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Win Chang, M.D. is a Internal Medicine Physician provider in Oakland, CA (NPI 1780827196).
Provider details
- NPI number
- 1780827196
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A106210 (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
17 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 · 80 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 615 | 231 |
| Amlodipine Besylate | 405 | 161 |
| Lisinopril | 257 | 94 |
| Hydrochlorothiazide | 208 | 76 |
| Losartan Potassium | 203 | 74 |
| Tamsulosin Hcl | 171 | 65 |
| Atenolol | 166 | 64 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-04-15
- Last updated
- 2022-02-11
Frequently asked questions
- What is Win Chang's NPI number?
- Win Chang's National Provider Identifier (NPI) is 1780827196, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Win Chang's specialty?
- Win Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Win Chang located?
- Win Chang's practice location on file with NPPES is 1411 E 31st St, Oakland, CA 94602-1018.
- What is Win Chang's phone number?
- The practice phone number listed in the NPPES registry for Win Chang is (510) 437-4780.
- Does Win Chang accept Medicare?
- Win Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Win Chang's NPI active?
- Yes — Win Chang's NPI (1780827196) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.