Quick answers
- Does Margaret T. Marshall accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret T. Marshall 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 T. Marshall see?
- In 2024, CMS data shows 431 Original Medicare patients and 2,883 services for Margaret T. Marshall. This counts Original Medicare only and measures volume, not quality.
- What is Margaret T. Marshall's NPI number?
- 1639170475. 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 T. Marshall, 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 | 431 |
|---|---|
| Services billed to Medicare | 2,883 |
| Different services or procedures | 80 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Injection, ceftriaxone sodium, per 250 mg (J0696)468 services
- Injection, ondansetron hydrochloride, per 1 mg (J2405)224 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)159 services
- Routine electrocardiogram (ecg) using at least 12 leads with tracing (93005)147 services
- Infusion into a vein for hydration, each additional hour (96361)145 services
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).
- High cholesterol75%
- High blood pressure73%
- Arthritis55%
- Ischemic heart disease33%
- Chronic kidney disease32%
- Anxiety27%
Hospitals where Margaret T. Marshall works
Medicare's Facility Affiliation Data lists Margaret T. Marshall at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Scripps Green HospitalLa Jolla, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: not listed by Medicare · CCN 050424
Practice locations
Addresses where Margaret T. Marshall is enrolled with Medicare (CMS data updated October 2, 2026).
- 10666 N Torrey Pines RdLa Jolla, CA 92037 (858) 554‑9100
- 10666 N Torrey Pines Rd, 2nd Floor SW209La Jolla, CA 92037 (858) 554‑8122
- 9888 Genesee AveLa Jolla, CA 92037 (858) 626‑4123
- 9896 Genesee AveLa Jolla, CA 92037 (858) 626‑4123
- 9898 Genesee AveLa Jolla, CA 92037 (858) 455‑9100
Group practices
Medicare enrollment lists Margaret T. Marshall as a member of this group (CMS data updated October 2, 2026).
- Scripps Health1,433 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in La Jolla
Clinicians with the same Medicare primary specialty in La Jolla, CA — not a recommendation.
Other clinicians in Scripps Health
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Diego School Of Medicine |
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639170475 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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