Han Kyo K. Chang, M.D
Internal Medicine Physician · Walnut Creek, CA
Han Kyo K. Chang, M.D is an internal medicine physician with a practice address in Walnut Creek, California, and NPI 1235127150, issued on Oct 13, 2005. Check the license (California C138034, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Han Kyo K. Chang
- Credential
- M.D
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- C138034 CA
125005 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1434 Stanley Dollar Dr, Walnut Creek, CA 94595
- Phone
- (716) 418-4665
- Enumerated
- Oct 13, 2005
- Record last updated
- Nov 30, 2022
- Fax
- (925) 954-8696
- Medicaid ID
- 00602837 NY
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Han Kyo K. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C138034Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
48% more Medicare Part D claims than the average internal medicine physician in 2024
4,685 Medicare Part D claims for 415 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Atorvastatin Calcium454 claims
- Amlodipine Besylate269 claims
- Losartan Potassium235 claims
- Metformin Hcl234 claims
- Lisinopril200 claims
- Levothyroxine Sodium152 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Han Kyo K. Chang among 17,696 internal medicine physician records in California
Han Kyo K. Chang, M.D is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2022 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
183 internal medicine physician records list a practice address in Walnut Creek
They are 183 of the 6,170 NPPES records with a practice address in Walnut Creek, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Walnut Creek → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Viviane Alfandary, M.D.Walnut Creek, CA 945951053338095
- Sukhjinder Brah, M.D.Walnut Creek, CA 945951023044559
- Lonnie Bristow, M.D.Walnut Creek, CA 945951871510529
- Smita Chandra, M.D.Walnut Creek, CA 945951811917826
- Russell Everest, M.D.Walnut Creek, CA 945951528085404
- Kamal Ghei, M.D.Walnut Creek, CA 945951366490120
- Lavinia Herbei, M.D.Walnut Creek, CA 945951508834946
- Scott Morehouse, M.D.Walnut Creek, CA 945951730109620
Common questions
What is Han Kyo K. Chang, M.D's NPI number?
Han Kyo K. Chang, M.D's National Provider Identifier (NPI) is 1235127150, issued on Oct 13, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Han Kyo K. Chang, M.D located?
The NPPES record lists a practice address at 1434 Stanley Dollar Dr, Walnut Creek, CA, 94595. Phone: (716) 418-4665. Providers update this record themselves, so call before visiting.
How can I verify Han Kyo K. Chang, M.D's license?
NPPES lists California license number C138034, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Han Kyo K. Chang, M.D prescribe under Medicare Part D?
In 2024, Han Kyo K. Chang, M.D had 4,685 Medicare Part D claims for 415 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.