Nancy Sun, M.D.
Emergency Medicine Physician · Simi Valley, CA
Nancy Sun, M.D. is an emergency medicine physician with a practice address in Simi Valley, California, and NPI 1821146051, issued on Jan 5, 2007. Check the license (California A98171, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nancy Sun
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A98171 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2975 Sycamore Dr, Simi Valley, CA 93065
- Phone
- (805) 955-6107
- Enumerated
- Jan 5, 2007
- Record last updated
- Jan 28, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (805) 527-9374
- Medicare enrollment
- Enrolled (PECOS I20070424000721); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 2000
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 2975 Sycamore Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Armen BabakhanyanNurse Practitioner1518505197
- Andrew Bourgeois, M.D.Emergency Medicine Physician1891992095
- Yuvraj Brar, MDInternal Medicine Physician1215590989
- Lorraine Burke, MS, RDRegistered Dietitian1770966129
- Jennifer Christeson, LCSWClinical Social Worker1881856235
Verify Nancy Sun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A98171Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% more Medicare Part D claims than the average emergency medicine physician in 2024
403 Medicare Part D claims for 278 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 62 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen46 claims
- Ondansetron Odt37 claims
- Cefuroxime32 claims
- Cyclobenzaprine Hcl20 claims
- Azithromycin19 claims
- Pantoprazole Sodium15 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): 84.6 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).
Bills Medicare through one group practice
- Allied Emergency Physicians, Inc.Simi Valley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nancy Sun among 7,751 emergency medicine physician records in California
Nancy 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 fileYes · 59% of these records are
- Graduated2000 · median 2011 among the 4,560 with a school on file
- Record last updated2020 · 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).
13 emergency medicine physician records list a practice address in Simi Valley
They are 13 of the 1,397 NPPES records with a practice address in Simi Valley, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Simi Valley → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Andrew Bourgeois, M.D.Simi Valley, CA 930651891992095
- Hossein Gharakhani, D.O.Simi Valley, CA 930651902844525
- Anthony Ho, D.O.Simi Valley, CA 930651518293943
- Laura Leistiko, M.D.Simi Valley, CA 930651508810185
- Daniel McGinn, DOSimi Valley, CA 930651508964628
- Marc Mendes, M.D.Simi Valley, CA 930651093758666
- Afomia Mesfin, MDSimi Valley, CA 930651417578212
- Joyce Norman, M.D.Simi Valley, CA 930651043252059
Common questions
What is Nancy Sun, M.D.'s NPI number?
Nancy Sun, M.D.'s National Provider Identifier (NPI) is 1821146051, issued on Jan 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Nancy Sun, M.D. located?
The NPPES record lists a practice address at 2975 Sycamore Dr, Simi Valley, CA, 93065. Phone: (805) 955-6107. Providers update this record themselves, so call before visiting.
How can I verify Nancy Sun, M.D.'s license?
NPPES lists California license number A98171, 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 Nancy Sun, M.D. prescribe under Medicare Part D?
In 2024, Nancy Sun, M.D. had 403 Medicare Part D claims for 278 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Nancy Sun, M.D.'s MIPS final score?
The 2023 MIPS final score is 84.6 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.