DR. THOMAS O'BRIEN D.O.
NPI 1063434298
Family Medicine in Brooklyn, NY
About Dr. Thomas O'brien D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. THOMAS O'BRIEN D.O. (NPI 1063434298) is an individual family medicine provider in Brooklyn, New York, licensed in New York (210513) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of Des Moines University Of Osteopathic Medicine And Health Sciences (1995).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Thomas O'brien D.o. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
5Medicare enrollment records show Thomas O'brien reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10016
- Reassigned Medicare billing, New York enrollment
Jamaica, NY 11423
- Reassigned Medicare billing, New York enrollment
- 1,393 clinicians in this Medicare group
New Hyde Park, NY 11040
- Reassigned Medicare billing, New York enrollment
- 39 clinicians in this Medicare group
Bronx, NY 10452
- Reassigned Medicare billing, New York enrollment
- 683 clinicians in this Medicare group
Bronx, NY 10461
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Bronx Medical Practice PC
- 1,013 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11210 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BROOKLYN, NY 11210
BROOKLYN, NY 11210
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 Thomas O'brien's NPI number?
The NPI number for Thomas O'brien is 1063434298. It was assigned to this individual provider in the NPPES registry on July 24, 2006.
Where is Thomas O'brien located?
Thomas O'brien practices at 1700 Flatbush Ave, Brooklyn, NY 11210. The listed phone number is (516) 330-4173.
What is Thomas O'brien's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Thomas O'brien enrolled in Medicare?
Yes. Thomas O'brien is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Thomas O'brien's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas O'brien reassigns Medicare benefits to 5 organizations: Thomas G. O'brien II, Ms,do,pc (New York, NY), Essen Medical Associates,pc (Jamaica, NY), Lefferts Medical Associates PC (New Hyde Park, NY), Essen Medical Urgicare, PLLC (Bronx, NY) and Bronx Medical Practice P.C. (Bronx, NY). 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 Thomas O'brien's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Thomas O'brien was last updated on January 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months 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.
# Dr. Thomas O'brien, D.O. · NPI 1063434298
Family Medicine physician in Brooklyn, New York. Individual provider, active in the CMS NPPES registry since July 24, 2006.
## Identity
- **NPI:** 1063434298 (Entity type: Individual)
- **Enumerated:** July 24, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 210513 (New York)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1700 FLATBUSH AVE, Brooklyn, NY 11210-3943
- **Phone:** (516) 330-4173
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **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): Thomas G. O'brien II, Ms,do,pc (NPI 1205050671, New York, NY); Essen Medical Associates,pc (NPI 1700023926, Jamaica, NY); Lefferts Medical Associates PC (NPI 1700922150, New Hyde Park, NY); Essen Medical Urgicare, PLLC (NPI 1841607298, Bronx, NY); Bronx Medical Practice P.C. (NPI 1356726087, Bronx, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Des Moines University Of Osteopathic Medicine And Health Sciences, class of 1995
## Record status
- **NPPES last updated:** January 8, 2026
- **Other identifiers:** Medicaid 01971484 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1063434298) · Data from the CMS NPPES public registry.