Howard Chang, MD
NPI 1700845336 · Internal Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Howard Chang, MD is a Internal Medicine Physician provider in Oakland, CA (NPI 1700845336).
Provider details
- NPI number
- 1700845336
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A100145 (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
20 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 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 86 | 39 |
| Entecavir | 67 | 21 |
| Sucralfate | 40 | 18 |
| Omeprazole | 38 | 15 |
| Tenofovir Disoproxil Fumarate | 28 | — |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 28 | 25 |
| Mesalamine | 23 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-22
- Last updated
- 2021-12-09
Frequently asked questions
- What is Howard Chang's NPI number?
- Howard Chang's National Provider Identifier (NPI) is 1700845336, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Howard Chang's specialty?
- Howard Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Howard Chang located?
- Howard Chang's practice location on file with NPPES is 275 W Macarthur Blvd, Oakland, CA 94611-5641.
- What is Howard Chang's phone number?
- The practice phone number listed in the NPPES registry for Howard Chang is (510) 752-1000.
- Does Howard Chang accept Medicare?
- Howard Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Howard Chang's NPI active?
- Yes — Howard Chang's NPI (1700845336) is active in the NPPES registry as of the last update on 2021-12-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.