Margaret Swenson Soper, MD
Radiation Oncology Physician · Los Angeles, CA
Margaret Swenson Soper, MD is a radiation oncology physician with a practice address in Los Angeles, California, and NPI 1386806180, issued on Jul 2, 2008. Check the license (California A101946, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Margaret Swenson Soper
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A101946 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4950 W Sunset Blvd, Los Angeles, CA 90027
- Phone
- (323) 783-6570
- Enumerated
- Jul 2, 2008
- Record last updated
- Oct 16, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20101023000246); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 2006
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Also registered at 4950 W Sunset Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Margaret Swenson Soper in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A101946Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% more Medicare Part D claims than the average radiation oncology physician in 2024
146 Medicare Part D claims for 60 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Tamsulosin Hcl62 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 one group practice
- Southern California Permanente Medical GroupLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Swenson Soper among 735 radiation oncology physician records in California
Margaret Swenson Soper, MD 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 2008, is newer than 57% of them.
- NPI issued2008 · 57% of these records are older, 38% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2006 · median 2005 among the 545 with a school on file
- Record last updated2021 · 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 Los Angeles → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Edward Brunngraber, MDLos Angeles, CA 900271891866877
- Harry Cosmatos, MDLos Angeles, CA 900271902977978
- Michael Girvigian, MDLos Angeles, CA 900271215008289
- Barry Goy, MDLos Angeles, CA 900271609947688
- Kevin Holland, MDLos Angeles, CA 900271184796419
- Julie Hwang, MDLos Angeles, CA 900271396804993
- Teri Katz, MDLos Angeles, CA 900271639246457
- Kenneth Lodin, MDLos Angeles, CA 900271306913314
Common questions
What is Margaret Swenson Soper, MD's NPI number?
Margaret Swenson Soper, MD's National Provider Identifier (NPI) is 1386806180, issued on Jul 2, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Swenson Soper, MD located?
The NPPES record lists a practice address at 4950 W Sunset Blvd, Los Angeles, CA, 90027. Phone: (323) 783-6570. Providers update this record themselves, so call before visiting.
How can I verify Margaret Swenson Soper, MD's license?
NPPES lists California license number A101946, 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 Margaret Swenson Soper, MD prescribe under Medicare Part D?
In 2024, Margaret Swenson Soper, MD had 146 Medicare Part D claims for 60 beneficiaries; the average among radiation oncology physician prescribers was 134. 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.