JAMES NIELSEN M.D.
NPI 1669432266
Pediatrics - Pediatric Cardiology in East Setauket, NY
About James Nielsen M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JAMES NIELSEN M.D. (NPI 1669432266) is an individual pediatric cardiology provider in East Setauket, New York, licensed in New York (213529-1) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with Nyu Langone Hospitals, and maintains a secondary practice location in Mineola.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
James Nielsen M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
5Medicare enrollment records show James Nielsen reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Jamaica, NY 11432
- Reassigned Medicare billing, New York enrollment
- 1,615 clinicians in this Medicare group
New York, NY 10037
- Reassigned Medicare billing, New York enrollment
- 2,094 clinicians in this Medicare group
New York, NY 10029
- Reassigned Medicare billing, New York enrollment
- 623 clinicians in this Medicare group
New York, NY 10016
- Reassigned Medicare billing, New York enrollment
- 616 clinicians in this Medicare group
Boynton Beach, FL 33426
- Reassigned Medicare billing, New York enrollment
- 7,712 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Nyu Langone Hospitals
Acute Care Hospitals · New York, NYOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
EAST SETAUKET, NY 11733
EAST SETAUKET, NY 11733
EAST SETAUKET, NY 11733
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is James Nielsen's NPI number?
The NPI number for James Nielsen is 1669432266. It was assigned to this individual provider in the NPPES registry on March 27, 2006.
Where is James Nielsen located?
James Nielsen practices at 4 Technology Dr Suite 2, East Setauket, NY 11733. The listed phone number is (631) 444-0650.
What is James Nielsen's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Cardiology, with taxonomy code 2080P0202X.
Is James Nielsen enrolled in Medicare?
Yes. James Nielsen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for James Nielsen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), James Nielsen reassigns Medicare benefits to 5 organizations: New York City Health And Hospitals Corporation (Jamaica, NY), Physician Affiliate Group Of New York PC (New York, NY), Metropolitan Medical Practice Plan PC (New York, NY), Nyu Langone Hospitals (New York, NY) and New York University (Boynton Beach, FL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for James Nielsen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is James Nielsen affiliated with any hospitals?
According to CMS data, James Nielsen is affiliated with Nyu Langone Hospitals.
When was this NPI record last updated?
The NPPES record for James Nielsen was last updated on August 19, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# James Nielsen, M.D. · NPI 1669432266
Pediatric Cardiology physician in East Setauket, New York. Individual provider, active in the CMS NPPES registry since March 27, 2006.
## Identity
- **NPI:** 1669432266 (Entity type: Individual)
- **Enumerated:** March 27, 2006
- **Primary specialty:** Pediatrics - Pediatric Cardiology · taxonomy 2080P0202X
- **State license:** 213529-1 (New York)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 4 TECHNOLOGY DR, SUITE 2, East Setauket, NY 11733-4080
- **Phone:** (631) 444-0650
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): New York City Health And Hospitals Corporation (NPI 1801803903, Jamaica, NY); Physician Affiliate Group Of New York PC (NPI 1013375526, New York, NY); Metropolitan Medical Practice Plan PC (NPI 1306138383, New York, NY); Nyu Langone Hospitals (NPI 1790975944, New York, NY); New York University (NPI 1285826438, Boynton Beach, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Tulane University School Of Medicine, class of 1995
## Record status
- **NPPES last updated:** August 19, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1669432266) · Data from the CMS NPPES public registry.