James Nielsen, M.D.
NPI 1669432266 · Pediatric Cardiology Physician · East Setauket, NY
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Nielsen, M.D. is a Pediatric Cardiology Physician provider in East Setauket, NY (NPI 1669432266).
Provider details
- NPI number
- 1669432266
- Entity type
- Individual
- Primary specialty
- Pediatric Cardiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 213529 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
2 documented practice locations
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
Additional practice locations (1)
- 120 Mineola BlvdMineola, NY 11501-4064Phone: (516) 663-4600
Registry dates
- Enumerated
- 2006-03-27
- Last updated
- 2022-08-19
- Certified
- 2022-08-19
Frequently asked questions
- What is James Nielsen's NPI number?
- James Nielsen's National Provider Identifier (NPI) is 1669432266, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Nielsen's specialty?
- James Nielsen is listed in the NPPES registry with a primary specialty of Pediatric Cardiology Physician (Allopathic & Osteopathic Physicians).
- Where is James Nielsen located?
- James Nielsen's practice location on file with NPPES is 4 Technology Dr, East Setauket, NY 11733-4080.
- What is James Nielsen's phone number?
- The practice phone number listed in the NPPES registry for James Nielsen is (631) 444-0650.
- Does James Nielsen accept Medicare?
- James Nielsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Nielsen's NPI active?
- Yes — James Nielsen's NPI (1669432266) is active in the NPPES registry as of the last update on 2022-08-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.