J Am Med Inform Assoc
Ambulatory Care Information SystemsClinical Laboratory Information SystemsComputer Communication Networks
Dr. Sophia Whasun Chang, MD
NPI1548375983
- Part D claims, 2024
- 173
- Publications
- 9
- Hospital affiliations
- 1
- Industry payments
- $24
- Medical group
- 1
- Practice address
- 1001 Potrero Avenue, San Francisco, CA 94110
- Practice phone
- Call (415) 206-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Chang's professional email, personal email and mobile number
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Dr. Sophia Whasun Chang is an internist in San Francisco, California
Dr. Chang practices at Zuckerberg San Francisco General Hospital and Trauma Center in San Francisco, California, part of City and County of San Francisco, CA.
Dr. Chang's NPI, 1548375983, was assigned on August 19, 2006. Dr. Chang graduated from Vagelos College of Physicians and Surgeons in 1985. Dr. Chang holds California license G59695.
NPI and contact details
- NPI
- 1548375983NPI Registry (opens in a new tab)
- NPI enumeration date
- August 19, 2006
- NPI status
- Active
- Practice phone
- (415) 206-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Sophia Whasun Chang practices at Zuckerberg San Francisco General Hospital and Trauma Center in San Francisco, California
Dr. Chang's primary practice is Zuckerberg San Francisco General Hospital and Trauma Center, at 1001 Potrero Avenue, San Francisco, CA 94110 in San Francisco County. The practice phone is (415) 206-8000.
- Zuckerberg San Francisco General Hospital and Trauma Center1001 Potrero Avenue, San Francisco, CA 94110 · San Francisco CountyPhone(415) 206-8000
Source: Dmand AI Affiliation Data
Dr. Sophia Whasun Chang is affiliated with 1 site of care and 1 medical group
Dr. Chang's primary practice is Zuckerberg San Francisco General Hospital and Trauma Center in San Francisco, California, part of City and County of San Francisco, CA. The medical group on file is San Francisco Public Health Laboratory. Dr. Chang's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Sophia Whasun Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Zuckerberg San Francisco General Hospital and Trauma Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Sophia Whasun Chang is one of 16,751 internists in California
Internal medicine is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Chang is board certified in internal medicine by the American Board of Internal Medicine. Dr. Chang is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Chang
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
16,751internists in California1,127internists in San Francisco141internists at Zuckerberg San Francisco General Hospital and Trauma Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Sophia Whasun Chang's patients have a median age of 73
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 73, with 50% women.
Dr. Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women50%
- Men50%
Source: Dmand AI Patient Panel Data
Dr. Sophia Whasun Chang wrote 173 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 173 Medicare Part D claims for 45 patients. 82% of them were for generic drugs. CMS names the drug for 43 of them, across 3 drugs with 11 or more claims each, at $7,627 in total drug cost. In 2023, CMS named 43 claims across 3 drugs.
Part D claims, 2024173
Drugs named by CMS3
Total drug cost$7,627
Part D patients45
Dr. Chang's Part D claims by kind of drug, 2024
- Generic141 claims82%
- Brand-name32 claims18%
Dr. Chang's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 432024: 43No change
Drugs named by CMS: 3 in 2024, 3 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Sophia Whasun Chang has 9 publications on record
Dmand AI links 9 papers to Dr. Chang in 2009. The most frequent topics are HIV Infections, Clinical Laboratory Information Systems and Medical Records Systems, Computerized. Dr. Chang has published most often in N Engl J Med. Dr. Chang's most frequent co-authors are Samuel A. Bozzette, MD, PhD, Karla Kerlikowske, MD and Richard L. Kravitz, MD.
Papers9
Topics Dr. Chang writes about most
- HIV Infections
- Clinical Laboratory Information Systems
- Medical Records Systems, Computerized
- Quality Assurance, Health Care
- Systems Integration
Dr. Chang's most frequent co-authors
- Samuel A. Bozzette, MD, PhD2 shared papers
- Karla Kerlikowske, MD1 shared paper
- Richard L. Kravitz, MD1 shared paper
Recent publications by Dr. Chang
J Healthc Inf Manag
CaliforniaClinical Laboratory Information SystemsClinical Pharmacy Information Systems
BenzothiadiazinesDiureticsEjaculation
Breast NeoplasmsMammographyPredictive Value of Tests
See who Dr. Chang researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chang works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Sophia Whasun Chang received $24 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Chang from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Iovance Biotherapeutics, Inc. paid the most, $24.
Companies that paid Dr. Chang the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Sophia Whasun Chang graduated from Vagelos College of Physicians and Surgeons
Dr. Chang graduated from Vagelos College of Physicians and Surgeons in 1985. Dr. Chang is a member of ACP.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Sophia Whasun Chang's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Sophia Whasun Chang
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Sophia Whasun Chang's NPI number?
Dr. Sophia Whasun Chang's NPI number is 1548375983. It was assigned on August 19, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Sophia Whasun Chang?
Dr. Sophia Whasun Chang is an internist in San Francisco, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Sophia Whasun Chang practice?
Dr. Chang practices at 1001 Potrero Avenue, San Francisco, CA 94110. Dr. Chang's primary practice is Zuckerberg San Francisco General Hospital and Trauma Center in San Francisco, California, part of City and County of San Francisco, CA.
What is Dr. Sophia Whasun Chang's office phone number?
The practice phone on file for Dr. Chang is (415) 206-8000.
What is Dr. Sophia Whasun Chang's medical license number?
Dr. Chang holds California license G59695.
Which hospitals is Dr. Sophia Whasun Chang affiliated with?
Dr. Chang practices at Zuckerberg San Francisco General Hospital and Trauma Center in San Francisco, California.
What medical group is Dr. Sophia Whasun Chang part of?
Dr. Chang is linked to San Francisco Public Health Laboratory.
Is Dr. Sophia Whasun Chang board certified?
Yes. Dr. Chang is board certified in internal medicine by the American Board of Internal Medicine.
Where did Dr. Sophia Whasun Chang go to medical school?
Dr. Chang graduated from Vagelos College of Physicians and Surgeons in 1985.
What drugs does Dr. Sophia Whasun Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Amlodipine Besylate, Allopurinol and Entresto.
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Has Dr. Sophia Whasun Chang received payments from drug or device companies?
CMS Open Payments shows $24 in general payments to Dr. Chang from 1 company from 2025 to 2025. The largest total came from Iovance Biotherapeutics, Inc.
How long has Dr. Sophia Whasun Chang been practicing?
Dr. Chang graduated from medical school in 1985, 41 years ago.
Does Dr. Sophia Whasun Chang do research?
Dmand AI links 9 publications to Dr. Chang.
Who does Dr. Sophia Whasun Chang publish with?
Dr. Chang's most frequent co-authors are Samuel A. Bozzette, MD, PhD (2 shared papers), Karla Kerlikowske, MD (1 shared paper) and Richard L. Kravitz, MD (1 shared paper).
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