Han Kyo Chang, M.D
NPI 1235127150 · Internal Medicine Physician · Walnut Creek, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Han Kyo Chang, M.D is a Internal Medicine Physician provider in Walnut Creek, CA (NPI 1235127150).
Provider details
- NPI number
- 1235127150
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- Yes
- License
- 125005 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Other Service Providers
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 · 82 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 454 | 131 |
| Amlodipine Besylate | 269 | 89 |
| Losartan Potassium | 235 | 62 |
| Metformin Hcl | 234 | 55 |
| Lisinopril | 200 | 50 |
| Levothyroxine Sodium | 152 | 29 |
| Empagliflozin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-13
- Last updated
- 2022-11-30
- Certified
- 2022-11-30
Frequently asked questions
- What is Han Kyo Chang's NPI number?
- Han Kyo Chang's National Provider Identifier (NPI) is 1235127150, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Han Kyo Chang's specialty?
- Han Kyo Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Han Kyo Chang located?
- Han Kyo Chang's practice location on file with NPPES is 1434 Stanley Dollar Dr, Walnut Creek, CA 94595.
- What is Han Kyo Chang's phone number?
- The practice phone number listed in the NPPES registry for Han Kyo Chang is (716) 418-4665.
- Does Han Kyo Chang accept Medicare?
- Han Kyo Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Han Kyo Chang's NPI active?
- Yes — Han Kyo Chang's NPI (1235127150) is active in the NPPES registry as of the last update on 2022-11-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.