Benjamin Louis Cahan, M.D.
Radiation Oncology Physician · South Pasadena, CA
Benjamin Louis Cahan, M.D. is a radiation oncology physician with a practice address in South Pasadena, California, and NPI 1396034229, issued on Mar 31, 2011. Check the license (California A123974, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Benjamin Louis Cahan
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A123974 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
- Mar 31, 2011
- Record last updated
- Jun 8, 2022
- Medicare enrollment
- Enrolled (PECOS I20160412001226); accepts Medicare assignment
- Medical or professional school
- Un Of California, Irvine, College Of Medicine, 2011
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Also registered at 209 Fair Oaks Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Helen Chen, MDRadiation Oncology Physician1578546388
- 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 Benjamin Louis Cahan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A123974Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average radiation oncology physician in 2024
80 Medicare Part D claims for 33 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl36 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).
Industry payments in 2024: $17.82
1 payment: food and beverage; the largest payer was Ambu Inc. The 3,275 providers of this specialty with any payment received $1,897.85 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.
Bills Medicare through one group practice
- City OF Hope Medical FoundationMission Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Benjamin Louis Cahan among 735 radiation oncology physician records in California
Benjamin Louis Cahan, M.D. is one of 735 radiation oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 69% of them.
- NPI issued2011 · 69% of these records are older, 29% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2011 · median 2005 among the 545 with a school on file
- Record last updated2022 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in California
There are 735 radiation oncology physician records in California.
All 735 in California → Every provider in South Pasadena → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Helen Chen, MDSouth Pasadena, CA 910301578546388
- Jason Liu, MDSouth Pasadena, CA 910301619537511
- Arya Amini, M.D.Duarte, CA 910101487910774
- Jose Bazan, MDDuarte, CA 910101851535504
- Yi-Jen Chen, MDDuarte, CA 910101972698868
- Savita Dandapani, M.D. , PH.D.Duarte, CA 910101619141751
- Scott Glaser, MDDuarte, CA 910101750643136
- Hyun Kim, MDDuarte, CA 910101467718379
Common questions
What is Benjamin Louis Cahan, M.D.'s NPI number?
Benjamin Louis Cahan, M.D.'s National Provider Identifier (NPI) is 1396034229, issued on Mar 31, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Benjamin Louis Cahan, M.D. 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 Benjamin Louis Cahan, M.D.'s license?
NPPES lists California license number A123974, 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 Benjamin Louis Cahan, M.D. prescribe under Medicare Part D?
In 2024, Benjamin Louis Cahan, M.D. had 80 Medicare Part D claims for 33 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is Benjamin Louis Cahan, M.D.'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.