Nancy Chang, MD
NPI 1184702284 · Internal Medicine Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nancy Chang, MD is a Internal Medicine Physician provider in Walnut Creek, CA (NPI 1184702284).
Provider details
- NPI number
- 1184702284
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A74566 (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
19 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 · 73 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 397 | 144 |
| Amlodipine Besylate | 252 | 97 |
| Lisinopril | 178 | 67 |
| Levothyroxine Sodium | 165 | 61 |
| Losartan Potassium | 160 | 57 |
| Hydrochlorothiazide | 119 | 46 |
| Atenolol | 102 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-02
- Last updated
- 2021-12-08
Frequently asked questions
- What is Nancy Chang's NPI number?
- Nancy Chang's National Provider Identifier (NPI) is 1184702284, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nancy Chang's specialty?
- Nancy Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Nancy Chang located?
- Nancy Chang's practice location on file with NPPES is 320 Lennon Ln, Walnut Creek, CA 94598-2419.
- What is Nancy Chang's phone number?
- The practice phone number listed in the NPPES registry for Nancy Chang is (925) 906-2000.
- Does Nancy Chang accept Medicare?
- Nancy Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nancy Chang's NPI active?
- Yes — Nancy Chang's NPI (1184702284) is active in the NPPES registry as of the last update on 2021-12-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.