William Mallon, MD
NPI 1881635811 · Emergency Medical Services (Emergency Medicine) Physician · Stony Brook, NY
William Mallon, MD is a Emergency Medical Services (Emergency Medicine) Physician provider in Stony Brook, NY (NPI 1881635811).
Provider details
- NPI number
- 1881635811
- Entity type
- Individual
- Primary specialty
- Emergency Medical Services (Emergency Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 282233 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-09
- Last updated
- 2015-11-23
Frequently asked questions
- What is William Mallon's NPI number?
- William Mallon's National Provider Identifier (NPI) is 1881635811, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mallon's specialty?
- William Mallon is listed in the NPPES registry with a primary specialty of Emergency Medical Services (Emergency Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is William Mallon located?
- William Mallon's practice location on file with NPPES is Stony Brook Medicine Dept of Emergency, Stony Brook, NY 11794-8350.
- What is William Mallon's phone number?
- The practice phone number listed in the NPPES registry for William Mallon is (631) 444-2478.
- Is William Mallon's NPI active?
- Yes — William Mallon's NPI (1881635811) is active in the NPPES registry as of the last update on 2015-11-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.