William Chang, MD
NPI 1265173892 · Student in an Organized Health Care Education/Training Program · Sylmar, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Chang, MD is a Student in an Organized Health Care Education/Training Program provider in Sylmar, CA (NPI 1265173892).
Provider details
- NPI number
- 1265173892
- Entity type
- Individual
- Primary specialty
- Student in an Organized Health Care Education/Training ProgramStudent, Health Care
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 yrs in NPPES registry
- Profile completeness38% of score
83% 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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 22 | 12 |
| Lisinopril | 19 | — |
| Furosemide | 17 | — |
| Cabergoline | 15 | — |
| Amlodipine Besylate | 14 | — |
| Carvedilol | 14 | — |
| Levothyroxine Sodium | 14 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2022-04-06
- Last updated
- 2022-04-06
- Certified
- 2022-03-22
Frequently asked questions
- What is William Chang's NPI number?
- William Chang's National Provider Identifier (NPI) is 1265173892, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Chang's specialty?
- William Chang is listed in the NPPES registry with a primary specialty of Student in an Organized Health Care Education/Training Program (Student, Health Care).
- Where is William Chang located?
- William Chang's practice location on file with NPPES is 14445 Olive View Dr, Sylmar, CA 91342-1437.
- What is William Chang's phone number?
- The practice phone number listed in the NPPES registry for William Chang is (747) 210-3000.
- Does William Chang accept Medicare?
- William Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Chang's NPI active?
- Yes — William Chang's NPI (1265173892) is active in the NPPES registry as of the last update on 2022-04-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.