Quick answers
- Does Margaret S. Soper accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret S. Soper accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Margaret S. Soper see?
- In 2024, CMS data shows 20 Original Medicare patients and 71 services for Margaret S. Soper. This counts Original Medicare only and measures volume, not quality.
- What is Margaret S. Soper's NPI number?
- 1386806180. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Margaret S. Soper, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 20 |
|---|---|
| Services billed to Medicare | 71 |
| Different services or procedures | 25 |
| Participating Medicare provider | Yes |
| Average age of these patients | 68 |
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
Practice locations
Addresses where Margaret S. Soper is enrolled with Medicare (CMS data updated October 2, 2026).
- 4725 -4733 Sunset BlvdLos Angeles, CA 90027 (323) 783‑4011
- 4733 W Sunset BlvdLos Angeles, CA 90027 (213) 667‑4784
- 4950 W Sunset BlvdLos Angeles, CA 90027 (323) 783‑4011
- 5601 De Soto AveWoodland Hills, CA 91367 (818) 719‑2000
Group practices
Medicare enrollment lists Margaret S. Soper as a member of this group (CMS data updated October 2, 2026).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Los Angeles
Clinicians with the same Medicare primary specialty in Los Angeles, CA — not a recommendation.
Other clinicians in Southern California Permanente Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Harvard Medical School |
| Graduation year | 2006 (20 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1386806180 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians