MR. NESTOR J FLORES MD
NPI 1255830378
Internal Medicine in Stony Brook, NY
About Mr. Nestor J Flores Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. NESTOR J FLORES MD (NPI 1255830378) is an individual internal medicine provider in Stony Brook, New York, licensed in Massachusetts (1020023) and active in the NPI registry since February 2018. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mr. Nestor J Flores Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Nestor Flores reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Stony Brook, NY 11794
- Reassigned Medicare billing, New York enrollment
- 261 clinicians in this Medicare group
Springfield, MA 01199
- Reassigned Medicare billing, Massachusetts enrollment
- 1,537 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 11794 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
STONY BROOK, NY 11794
STONY BROOK, NY 11794
STONY BROOK, NY 11794
STONY BROOK, NY 11794
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 Nestor Flores's NPI number?
The NPI number for Nestor Flores is 1255830378. It was assigned to this individual provider in the NPPES registry on February 4, 2018.
Where is Nestor Flores located?
Nestor Flores practices at 101 Nicolls Rd, Stony Brook, NY 11794. The listed phone number is (631) 689-8333.
What is Nestor Flores's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Nestor Flores enrolled in Medicare?
Yes. Nestor Flores is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Nestor Flores's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nestor Flores reassigns Medicare benefits to 2 organizations: Stony Brook Internists, University Faculty Practice Corporation (Stony Brook, NY) and Baystate Medical Practices, Inc (Springfield, MA). 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 Nestor Flores'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 Nestor Flores was last updated on June 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Mr. Nestor J Flores, MD · NPI 1255830378
Internal Medicine physician in Stony Brook, New York. Individual provider, active in the CMS NPPES registry since February 4, 2018.
## Identity
- **NPI:** 1255830378 (Entity type: Individual)
- **Enumerated:** February 4, 2018
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 1020023 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 NICOLLS RD, Stony Brook, NY 11794-0001
- **Phone:** (631) 689-8333
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Stony Brook Internists, University Faculty Practice Corporation (NPI 1215976337, Stony Brook, NY); Baystate Medical Practices, Inc (NPI 1548205909, Springfield, MA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** June 30, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1255830378) · Data from the CMS NPPES public registry.