Helen K. Chen, MD
Radiation Oncology Physician · South Pasadena, CA
Helen K. Chen, MD is a radiation oncology physician with a practice address in South Pasadena, California, and NPI 1578546388, issued on Nov 25, 2005. Check the license (California G70470, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Helen K. Chen
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- G70470 CA
Self-reported in NPPES; status is on the state search - Practice location
- 209 Fair Oaks Ave, South Pasadena, CA 91030
- Phone
- (626) 396-2900
- Enumerated
- Nov 25, 2005
- Record last updated
- Nov 23, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (626) 799-2889
- Medicaid ID
- 00G704700 CA
- Medicare enrollment
- Enrolled (PECOS I20040219000340); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1989
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 209 Fair Oaks Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Benjamin Cahan, M.D.Radiation Oncology Physician1396034229
- Samuel Chung, M.D.Hematology & Oncology Physician1609057157
- Loretta Erhunmwunsee, M.D.Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician1336307735
- Wei Feng, MDEndocrinology, Diabetes & Metabolism Physician1043277601
- Abigail Fong, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1265886691
- Thomas Gernon, MDOtolaryngology Physician1548387525
Verify Helen K. Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G70470Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% fewer Medicare Part D claims than the average radiation oncology physician in 2024
79 Medicare Part D claims for 24 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl15 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): 99.1 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
- City OF Hope Medical FoundationSouth Pasadena, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Radiation Oncology Physician providers in California
There are 735 radiation oncology physician records in California.
Other radiation oncology physician records in California
- Christina Abel, NURSE PRACTITIONEROrange, CA1033638911
- Jonathan Abelson, M.D.Thousand Oaks, CA1730348053
- Roy Abendroth, MDSan Francisco, CA1811988421
- Sunil Advani, M.D.La Jolla, CA1669649844
- Faisal Ahmed, MDStanford, CA1427314855
- Eugene Ahn, MDSimi Valley, CA1912999533
- Matthew Allen, MDRedding, CA1235301714
- Zahora Ally, MDAntioch, CA1306839915
- Munther Alqaisi, M.D.San Bernardino, CA1356454300
- Alessandra Amadeo, MDTorrance, CA1225011034
Common questions
What is Helen K. Chen, MD's NPI number?
Helen K. Chen, MD's National Provider Identifier (NPI) is 1578546388, issued on Nov 25, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Helen K. Chen, MD located?
The NPPES record lists a practice address at 209 Fair Oaks Ave, South Pasadena, CA, 91030. Phone: (626) 396-2900. Providers update this record themselves, so call before visiting.
How can I verify Helen K. Chen, MD's license?
NPPES lists California license number G70470, 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 Helen K. Chen, MD prescribe under Medicare Part D?
In 2024, Helen K. Chen, MD had 79 Medicare Part D claims for 24 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is Helen K. Chen, MD's MIPS final score?
The 2023 MIPS final score is 99.1 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.