Alexander A. Chang, M.D.
Internal Medicine Physician · San Francisco, CA
Alexander A. Chang, M.D. is an internal medicine physician with a practice address in San Francisco, California, and NPI 1225356231, issued on May 14, 2010. Check the license (California A127376, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Alexander A. Chang
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A127376 CA
Self-reported in NPPES; status is on the state search - Practice location
- 909 Hyde St Ste 230, San Francisco, CA 94109
- Phone
- (415) 779-8332
- Enumerated
- May 14, 2010
- Record last updated
- Jul 27, 2023
- Fax
- (415) 537-9078
- Medicare enrollment
- Enrolled (PECOS I20141028001532); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 909 Hyde St Ste 230
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Imee Williams, PA-CPhysician Assistant1427761402
Verify Alexander A. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A127376Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% more Medicare Part D claims than the average internal medicine physician in 2024
5,297 Medicare Part D claims for 400 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 17 claims were for opioids.
Most prescribed
- Atorvastatin Calcium518 claims
- Amlodipine Besylate287 claims
- Losartan Potassium241 claims
- Lisinopril170 claims
- Metformin Hcl159 claims
- Tamsulosin Hcl152 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.
Industry payments in 2024: $352.68
12 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Truelight Medical CorporationSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alexander A. Chang among 17,696 internal medicine physician records in California
Alexander A. 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 2010, is newer than 63% of them.
- NPI issued2010 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2014 · median 2004 among the 11,065 with a school on file
- Record last updated2023 · 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).
1,318 internal medicine physician records list a practice address in San Francisco
They are 1,318 of the 38,143 NPPES records with a practice address in San Francisco, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Francisco → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Amy Bossen, M.D.San Francisco, CA 941091558371260
- Gary Chan, M.D.San Francisco, CA 941091699702324
- Guido Gores, MDSan Francisco, CA 941091528073996
- Edwin Hassid, M.D.San Francisco, CA 941091033140702
- Gayatri Khanna, M.D.San Francisco, CA 941091639191455
- Martin Liberman, MDSan Francisco, CA 941091376530006
- Deborah Lindes, M.D.San Francisco, CA 941091952323776
- Aravind Mani, MDSan Francisco, CA 941091932151941
Common questions
What is Alexander A. Chang, M.D.'s NPI number?
Alexander A. Chang, M.D.'s National Provider Identifier (NPI) is 1225356231, issued on May 14, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Alexander A. Chang, M.D. located?
The NPPES record lists a practice address at 909 Hyde St Ste 230, San Francisco, CA, 94109. Phone: (415) 779-8332. Providers update this record themselves, so call before visiting.
How can I verify Alexander A. Chang, M.D.'s license?
NPPES lists California license number A127376, 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 Alexander A. Chang, M.D. prescribe under Medicare Part D?
In 2024, Alexander A. Chang, M.D. had 5,297 Medicare Part D claims for 400 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.