Kristoffer Ning Chang, M.D.
Specialist · San Francisco, CA
Kristoffer Ning Chang, M.D. is a specialist with a practice address in San Francisco, California, and NPI 1790761336, issued on Dec 15, 2005. Check the license (California G36914, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Kristoffer Ning Chang
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- G36914 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2100 Webster St, San Francisco, CA 94115
- Phone
- (415) 923-3860
- Enumerated
- Dec 15, 2005
- Record last updated
- Jul 23, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (415) 600-3549
- Medicare enrollment
- Enrolled (PECOS I20101130001248); accepts Medicare assignment
- Medical or professional school
- University Of Utah School Of Medicine, 1977
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 2100 Webster St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Kristoffer Ning Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G36914Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average specialist in 2024
60 Medicare Part D claims for 26 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. 17 claims were for opioids.
Most prescribed
- Cephalexin24 claims
- Acetaminophen-Codeine15 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.
Kristoffer Ning Chang among 5,749 specialist records in California
Kristoffer Ning Chang, M.D. is one of 5,749 specialist records with a practice address in California. 30% 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, 93% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1977 · median 1989 among the 1,075 with a school on file
- Record last updated2010 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
666 specialist records list a practice address in San Francisco
They are 666 of the 38,143 NPPES records with a practice address in San Francisco, and 5,749 specialist records in California.
All 5,749 in California → Every provider in San Francisco → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Barry Baron, MDSan Francisco, CA 941151467563353
- Ari Baron, M.D.San Francisco, CA 941151013086420
- Carolyn Cooper, M.D.San Francisco, CA 941151518010560
- Frank Farrell, M.D.San Francisco, CA 941151891770905
- Gary Feldman, M.D.San Francisco, CA 941151336220854
- Kathleen Grant, M.D.San Francisco, CA 941151538238548
- Sonya KashyapSan Francisco, CA 941151457444184
- George Kimmerling, M.D.San Francisco, CA 941151346313269
Common questions
What is Kristoffer Ning Chang, M.D.'s NPI number?
Kristoffer Ning Chang, M.D.'s National Provider Identifier (NPI) is 1790761336, issued on Dec 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Kristoffer Ning Chang, M.D. located?
The NPPES record lists a practice address at 2100 Webster St, San Francisco, CA, 94115. Phone: (415) 923-3860. Providers update this record themselves, so call before visiting.
How can I verify Kristoffer Ning Chang, M.D.'s license?
NPPES lists California license number G36914, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Kristoffer Ning Chang, M.D. prescribe under Medicare Part D?
In 2024, Kristoffer Ning Chang, M.D. had 60 Medicare Part D claims for 26 beneficiaries; the average among specialist prescribers was 1,380. 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.