Mary-Stewart Willsie, D.O.
NPI 1780818377 · Emergency Medicine Physician · Newark, DE
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary-Stewart Willsie, D.O. is a Emergency Medicine Physician provider in Newark, DE (NPI 1780818377).
Provider details
- NPI number
- 1780818377
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- Yes
- License
- C7-0004280 (DE)
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
17 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
602 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 267 | $93 |
| Urinalysis, Manual Test81002 | 53 | $3 |
| New Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 15 Minutes Or More99202 | 47 | $74 |
| X-Ray of Chest, 2 Views71046 | 46 | $35 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 46 | $132 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Doxycycline Hyclate | 38 | 38 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 28 | 28 |
| Fluticasone Propionate | 27 | 26 |
| Cephalexin | 23 | 22 |
| Prednisone | 20 | 20 |
| Methylprednisolone | 18 | 18 |
| Mupirocin | 16 | 16 |
| Albuterol Sulfate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-05-11
- Last updated
- 2013-07-25
Frequently asked questions
- What is Mary-Stewart Willsie's NPI number?
- Mary-Stewart Willsie's National Provider Identifier (NPI) is 1780818377, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary-Stewart Willsie's specialty?
- Mary-Stewart Willsie is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mary-Stewart Willsie located?
- Mary-Stewart Willsie's practice location on file with NPPES is 4755 Ogletown Stanton Rd, Newark, DE 19718-0001.
- What is Mary-Stewart Willsie's phone number?
- The practice phone number listed in the NPPES registry for Mary-Stewart Willsie is (130) 273-3100.
- Does Mary-Stewart Willsie accept Medicare?
- Mary-Stewart Willsie is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary-Stewart Willsie's NPI active?
- Yes — Mary-Stewart Willsie's NPI (1780818377) is active in the NPPES registry as of the last update on 2013-07-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.