Marshall Leonard, MD
NPI 1902255318 · Emergency Medicine Physician · Stony Brook, NY
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marshall Leonard, MD is a Emergency Medicine Physician provider in Stony Brook, NY (NPI 1902255318).
Provider details
- NPI number
- 1902255318
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
636 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 450 | $203 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 88 | $140 |
| Critical Care, First 30-74 Minutes99291 | 60 | $246 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 20 | $199 |
| Electrocardiogram (ecg) 1 to 3 Leads With Review By Physician Only93042 | 18 | $8 |
Typical Medicare-allowed amounts for these services range $8–$246 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (2)
- Department of Emergency Medicine300 Community Dr.Manhasset, NY 11030Phone: (516) 562-1238
- Stony Brook MedicineDepartment of Emergency Medicine, Hsc Level 4 Room 080Stony Brook, NY 11794-8350Phone: (631) 444-3880Fax: (631) 444-3919
Registry dates
- Enumerated
- 2016-06-07
- Last updated
- 2020-07-29
- Certified
- 2020-07-29
Frequently asked questions
- What is Marshall Leonard's NPI number?
- Marshall Leonard's National Provider Identifier (NPI) is 1902255318, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marshall Leonard's specialty?
- Marshall Leonard is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marshall Leonard located?
- Marshall Leonard's practice location on file with NPPES is 100 Nicolls Rd, Hsc, L4 Rm 50, Stony Brook, NY 11794-0001.
- What is Marshall Leonard's phone number?
- The practice phone number listed in the NPPES registry for Marshall Leonard is (631) 444-2478.
- Does Marshall Leonard accept Medicare?
- Marshall Leonard is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marshall Leonard's NPI active?
- Yes — Marshall Leonard's NPI (1902255318) is active in the NPPES registry as of the last update on 2020-07-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.