Stephen Yan Chun To, M.D.
Diagnostic Radiology Physician · Pomona, CA
Stephen Yan Chun To, M.D. is a diagnostic radiology physician with a practice address in Pomona, California, and NPI 1932165263, issued on Apr 25, 2006. Check the license (California G75106, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen Yan Chun To
- Credential
- M.D.
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License number
- G75106 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1798 N Garey Ave, Pomona, CA 91767
- Phone
- (909) 865-9532
- Enumerated
- Apr 25, 2006
- Record last updated
- Jun 12, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (909) 397-0194
- Medicaid ID
- 00G751060 CA
- Medicare enrollment
- Enrolled (PECOS I20040128000698); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 1991
- Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 4,500 in California → Look up another NPI →
Also registered at 1798 N Garey Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Monique AbdallaRegistered Nurse1871398297
- Brent Abutin, PTAPhysical Therapy Assistant1144728023
- Anna Adongo, M.D.Anesthesiology Physician1497011902
- Fran Allas, OTR/LNeurorehabilitation Occupational Therapist1467081828
- Yvette Ambroze, FNPFamily Nurse Practitioner1336616879
- Arjun Bakshi, DOEmergency Medicine Physician1659968303
Verify Stephen Yan Chun To in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G75106Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Pomona Valley Imaging Medical Group IncPomona, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Yan Chun To among 4,500 diagnostic radiology physician records in California
Stephen Yan Chun To, M.D. is one of 4,500 diagnostic radiology physician records with a practice address in California. 74% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1991 · median 2004 among the 3,130 with a school on file
- Record last updated2012 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Diagnostic Radiology Physician providers in California
There are 4,500 diagnostic radiology physician records in California.
All 4,500 in California → Every provider in Pomona → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- Alexander Chien, MDPomona, CA 917671255313318
- Harold Damuth, MDPomona, CA 917671902888514
- Bernie Goler, M.D.Pomona, CA 917671285693101
- Gary Jensen, MDPomona, CA 917671558304139
- Hrayr Kabakian, MDPomona, CA 917671053393017
- Constantina Lampropoulos, M.D.Pomona, CA 917671912942749
- Johnson Lightfoote, M.D.Pomona, CA 917671083696637
- Huma Qureshi, M.D.Pomona, CA 917671568447357
Common questions
What is Stephen Yan Chun To, M.D.'s NPI number?
Stephen Yan Chun To, M.D.'s National Provider Identifier (NPI) is 1932165263, issued on Apr 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Yan Chun To, M.D. located?
The NPPES record lists a practice address at 1798 N Garey Ave, Pomona, CA, 91767. Phone: (909) 865-9532. Providers update this record themselves, so call before visiting.
How can I verify Stephen Yan Chun To, M.D.'s license?
NPPES lists California license number G75106, 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.
What is Stephen Yan Chun To, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.