Jennifer T. Chang, MD
Internal Medicine Physician · San Francisco, CA
Jennifer T. Chang, MD is an internal medicine physician with a practice address in San Francisco, California, and NPI 1598090441, issued on Oct 9, 2009. Check the license (California A111788, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jennifer T. Chang
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A111788 CA
260153 NY
Self-reported in NPPES; status is on the state search - Practice location
- 513 Parnassus Ave # 357, San Francisco, CA 94143
- Phone
- (415) 476-2777
- Enumerated
- Oct 9, 2009
- Record last updated
- Feb 11, 2022
- Fax
- (415) 476-0659
- Medicare enrollment
- Enrolled (PECOS I20110601000635); accepts Medicare assignment
- Medical or professional school
- Columbia University College Of Physicians And Surgeons, 2008
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 513 Parnassus Ave # 357
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David Nagle, MDInternal Medicine Physician1538516141
Verify Jennifer T. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A111788Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% fewer Medicare Part D claims than the average internal medicine physician in 2024
763 Medicare Part D claims for 371 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Gavilyte-C222 claims
- Pantoprazole Sodium109 claims
- Mesalamine41 claims
- Budesonide Dr39 claims
- Cholestyramine28 claims
- Creon21 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.
Bills Medicare through one group practice
- Permanente Medical Group IncSanta Clara, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jennifer T. Chang among 17,696 internal medicine physician records in California
Jennifer T. Chang, MD 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 2009, is newer than 60% of them.
- NPI issued2009 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2008 · median 2004 among the 11,065 with a school on file
- 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).
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 →
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- Andrew Posselt, MDSan Francisco, CA 941431235193616
Common questions
What is Jennifer T. Chang, MD's NPI number?
Jennifer T. Chang, MD's National Provider Identifier (NPI) is 1598090441, issued on Oct 9, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Jennifer T. Chang, MD located?
The NPPES record lists a practice address at 513 Parnassus Ave # 357, San Francisco, CA, 94143. Phone: (415) 476-2777. Providers update this record themselves, so call before visiting.
How can I verify Jennifer T. Chang, MD's license?
NPPES lists California license number A111788, 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 Jennifer T. Chang, MD prescribe under Medicare Part D?
In 2024, Jennifer T. Chang, MD had 763 Medicare Part D claims for 371 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.