Joanne Y. Sun, M.D.
Emergency Medicine Physician · San Francisco, CA
Joanne Y. Sun, M.D. is an emergency medicine physician with a practice address in San Francisco, California, and NPI 1871797837, issued on Jun 13, 2007. Check the license (California A100180, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joanne Y. Sun
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A100180 CA
Self-reported in NPPES; status is on the state search - Practice location
- 900 Hyde St, San Francisco, CA 94109
- Phone
- (415) 353-6300
- Enumerated
- Jun 13, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 900 Hyde St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joanne Y. Sun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A100180Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% fewer Medicare Part D claims than the average emergency medicine physician in 2024
129 Medicare Part D claims for 87 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Doxycycline Hyclate11 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 94.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $228.35
3 payments; by number, the most common kind was food and beverage; the largest payer was Inari Medical, Inc. The 12,335 providers of this specialty with any payment received $953.79 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.
Joanne Y. Sun among 7,751 emergency medicine physician records in California
Joanne Y. Sun, M.D. is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 50% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2007 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in San Francisco → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Sherry Bird, MDSan Francisco, CA 941091245200336
- Reid Brackin, M.DSan Francisco, CA 941091538114004
- Lucia Chen-Luftig, M.D.San Francisco, CA 941091922022508
- Matthew Denny, M.D., M.P.H.San Francisco, CA 941091336283621
- Roel Farrales, MDSan Francisco, CA 941091821073198
- Corey Long, M.D.San Francisco, CA 941091841480159
- Gregg Miller, M.D.San Francisco, CA 941091386756807
- Richard Naidus, M.D.San Francisco, CA 941091972527455
Common questions
What is Joanne Y. Sun, M.D.'s NPI number?
Joanne Y. Sun, M.D.'s National Provider Identifier (NPI) is 1871797837, issued on Jun 13, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Joanne Y. Sun, M.D. located?
The NPPES record lists a practice address at 900 Hyde St, San Francisco, CA, 94109. Phone: (415) 353-6300. Providers update this record themselves, so call before visiting.
How can I verify Joanne Y. Sun, M.D.'s license?
NPPES lists California license number A100180, 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 Joanne Y. Sun, M.D. prescribe under Medicare Part D?
In 2024, Joanne Y. Sun, M.D. had 129 Medicare Part D claims for 87 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Joanne Y. Sun, M.D.'s MIPS final score?
The 2023 MIPS final score is 94.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.