Margaret Marshall, M.D.
NPI 1639170475 · Emergency Medicine Physician · Encinitas, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Marshall, M.D. is a Emergency Medicine Physician provider in Encinitas, CA (NPI 1639170475).
Provider details
- NPI number
- 1639170475
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A87417 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,252 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 159 | $135 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Tracing93005 | 147 | $7 |
| Infusion Into a Vein for Hydration, Each Additional Hour96361 | 145 | $14 |
| Injection of Drug Or Substance Into Vein96374 | 137 | $41 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 118 | $17 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 90 | $9 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cefuroxime Axetilbrand: Cefuroxime | 53 | 53 |
| Prednisone | 33 | 32 |
| Cephalexin | 25 | 25 |
| Azithromycin | 19 | 19 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 16 | 16 |
| Amoxicillin | 15 | 15 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 15 | 15 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-02
- Last updated
- 2009-11-25
Frequently asked questions
- What is Margaret Marshall's NPI number?
- Margaret Marshall's National Provider Identifier (NPI) is 1639170475, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Marshall's specialty?
- Margaret Marshall is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Marshall located?
- Margaret Marshall's practice location on file with NPPES is 354 Santa Fe Dr, Encinitas, CA 92024-5142.
- What is Margaret Marshall's phone number?
- The practice phone number listed in the NPPES registry for Margaret Marshall is (760) 230-2251.
- Does Margaret Marshall accept Medicare?
- Margaret Marshall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Marshall's NPI active?
- Yes — Margaret Marshall's NPI (1639170475) is active in the NPPES registry as of the last update on 2009-11-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.