James Sytuan Winn, D.O.
Emergency Medicine Physician · Chino, CA
James Sytuan Winn, D.O. is an emergency medicine physician with a practice address in Chino, California, and NPI 1336183730, issued on Jun 15, 2006. Check the license (California 20A5927, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Sytuan Winn
- Credential
- D.O.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 20A5927 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5451 Walnut Ave, Chino, CA 91710
- Phone
- (909) 464-8666
- Enumerated
- Jun 15, 2006
- Record last updated
- Apr 27, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (909) 464-8913
- Medicaid ID
- 00AX59270 CA
- Medicare enrollment
- Enrolled (PECOS I20031112000787); accepts Medicare assignment
- Medical or professional school
- College Of Osteo Med Of The Pacific At Pomona, 1989
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 5451 Walnut Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ashraf Abdel-KerimEmergency Medicine Physician1396961538
- Udhaya AeletyFamily Medicine Physician1740815943
- Ahmet AhmadiStudent in an Organized Health Care Education/Training Program1043199532
- Brian Ahn, D.O.Student in an Organized Health Care Education/Training Program1265849749
- Randall Allred, D.O.Student in an Organized Health Care Education/Training Program1629427703
- Harikrishna Ambati, MDFamily Medicine Physician1154998730
Verify James Sytuan Winn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A5927Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.0 times the Medicare Part D claims of the average emergency medicine physician in 2024
457 Medicare Part D claims for 220 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 57 claims were for opioids.
Most prescribed
- Ibuprofen51 claims
- Tramadol Hcl48 claims
- Ondansetron Hcl31 claims
- Prednisone26 claims
- Albuterol Sulfate Hfa19 claims
- Levocetirizine Dihydrochloride16 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 2 group practices
- Chino Emergency Medical Associates, Inc.Chino, CA
- Ignite Emergency Physicians A Medical CorporationChino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Sytuan Winn among 7,751 emergency medicine physician records in California
James Sytuan Winn, D.O. 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 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1989 · median 2011 among the 4,560 with a school on file
- Record last updated2012 · 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).
14 emergency medicine physician records list a practice address in Chino
They are 14 of the 1,097 NPPES records with a practice address in Chino, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Chino → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Ashraf Abdel-KerimChino, CA 917101396961538
- Michael CaoChino, CA 917101649638628
- Martin Carrillo, M.D.Chino, CA 917101861436339
- Douglas Cochrane, M.D.Chino, CA 917101417991811
- Jose Diaz, M.D.Chino, CA 917101306880836
- Pranav Kachhi, M.D.Chino, CA 917101801836606
- Khoa Luong, D.O.Chino, CA 917101649253691
- Ashok Madahar, M.D.Chino, CA 917101902846710
Common questions
What is James Sytuan Winn, D.O.'s NPI number?
James Sytuan Winn, D.O.'s National Provider Identifier (NPI) is 1336183730, issued on Jun 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James Sytuan Winn, D.O. located?
The NPPES record lists a practice address at 5451 Walnut Ave, Chino, CA, 91710. Phone: (909) 464-8666. Providers update this record themselves, so call before visiting.
How can I verify James Sytuan Winn, D.O.'s license?
NPPES lists California license number 20A5927, 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 James Sytuan Winn, D.O. prescribe under Medicare Part D?
In 2024, James Sytuan Winn, D.O. had 457 Medicare Part D claims for 220 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.