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KATHRYN BRIGITTE FASSNACHT CPNP
NPI 1932445509
Nurse Practitioner - Pediatrics in East Setauket, NY

Active since December 29, 2012PECOS Enrolled
37 RESEARCH WAY, EAST SETAUKET, NY 11733(631) 444-7884 Get Directions Write a Review

NPPES record last updated: May 5, 2015. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Kathryn Brigitte Fassnacht Cpnp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

KATHRYN BRIGITTE FASSNACHT CPNP (NPI 1932445509) is an individual pediatrics provider in East Setauket, New York, licensed in New York (38 382333) and active in the NPI registry since December 2012. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1932445509
Entity TypeIndividualFemale
Primary Taxonomy363LP0200X
Provider Legal NameKATHRYN BRIGITTE FASSNACHTCredential: CPNP
Location Address37 RESEARCH WAYEast Setauket, NY 11733-3465
Mailing AddressPo Box 1559Stony Brook, NY 11790-0989 · (631) 444-0650
Phone(631) 444-7884
Sole ProprietorNo
Enumeration DateDecember 29, 2012
Last NPPES UpdateMay 5, 2015
✔ NPI 1932445509 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · PediatricsPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LP0200X
License✔ Licensed in NY · 38 382333
37 RESEARCH WAY, East Setauket, NY 11733
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Kathryn Brigitte Fassnacht Cpnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Kathryn Fassnacht reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Stony Brook Children's Service, University Faculty Practice Corporatio
2.0 mi
Pediatrics
SUNY @ STONY BROOK, HSC, L11, RM 020
Stony Brook, NY 11794
  • Reassigned Medicare billing, New York enrollment
  • 191 clinicians in this Medicare group
NPI 1083660575 (631) 444-1362

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 11733 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$105.06 typical visit price
range $67.40 – $203.53
Typical copayment $26.26 (range $16.85 – $50.88)
Most-billed visit code 99203
Established Patient
$117.62 typical visit price
range $21.66 – $164.45
Typical copayment $29.40 (range $5.41 – $41.11)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

CHELSEY LENKA BOGUSLAWSKI MMS, PA-C
Physician Assistant
37 RESEARCH WAY
EAST SETAUKET, NY 11733
Suffolk County (631) 444-4121
DR. RICHARD SCRIVEN M.D.
Surgery (Pediatric Surgery)
37 RESEARCH WAY
EAST SETAUKET, NY 11733
Suffolk County (631) 444-4545
PAYAL R ANAND
Pediatrics (Pediatric Endocrinology)
37 RESEARCH WAY
EAST SETAUKET, NY 11733
Suffolk County (631) 444-5437
FRANCES M TANZELLA NP
Nurse Practitioner
37 RESEARCH WAY
EAST SETAUKET, NY 11733
Suffolk County (631) 444-4907
KATHRYN ELIZABETH COTTELL RD
Dietitian, Registered
37 RESEARCH WAY
EAST SETAUKET, NY 11733
Suffolk County (631) 444-4545
MS. KIMBERLY MCCOSKER PA-C
Physician Assistant
37 RESEARCH WAY
EAST SETAUKET, NY 11733
Suffolk County (631) 444-4121
JENNIFER LYNN KELUSKAR
Psychologist (Clinical Child & Adolescent)
37 RESEARCH WAY
EAST SETAUKET, NY 11733
Suffolk County (631) 444-4660
DR. WILLIAM B SMITHY M.D.
Surgery (Surgical Oncology)
37 RESEARCH WAY
EAST SETAUKET, NY 11733
Suffolk County (631) 444-4545

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 Kathryn Fassnacht's NPI number?

The NPI number for Kathryn Fassnacht is 1932445509. It was assigned to this individual provider in the NPPES registry on December 29, 2012.

Where is Kathryn Fassnacht located?

Kathryn Fassnacht practices at 37 Research Way, East Setauket, NY 11733. The listed phone number is (631) 444-7884.

What is Kathryn Fassnacht's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Pediatrics, with taxonomy code 363LP0200X.

Is Kathryn Fassnacht enrolled in Medicare?

Yes. Kathryn Fassnacht is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Kathryn Fassnacht's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Kathryn Fassnacht reassigns Medicare benefits to Stony Brook Children's Service, University Faculty Practice Corporatio (Stony Brook, NY). The 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 Kathryn Fassnacht'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 Kathryn Fassnacht was last updated on May 5, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.