MS. ABBY RACHEL LEEFER LCSW
NPI 1003888413
Social Worker - Clinical in Port Jefferson, NY
About Ms. Abby Rachel Leefer Lcsw NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. ABBY RACHEL LEEFER LCSW (NPI 1003888413) is an individual clinical provider in Port Jefferson, New York, licensed in New York (R042715-1) and active in the NPI registry since February 2006. She is enrolled in Medicare PECOS and is a graduate of Other (1989).
NPPES Registry Identity
Specialties & Licenses
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
Ms. Abby Rachel Leefer Lcsw 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 Reassignment
Medicare enrollment records show Abby Leefer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Port Jefferson, NY 11777
- Reassigned Medicare billing, New York enrollment
- 2 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11777 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
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Abby Leefer's NPI number?
The NPI number for Abby Leefer is 1003888413. It was assigned to this individual provider in the NPPES registry on February 2, 2006.
Where is Abby Leefer located?
Abby Leefer practices at 35 Puritan Path, Port Jefferson, NY 11777. The listed phone number is (631) 928-9808.
What is Abby Leefer's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Abby Leefer enrolled in Medicare?
Yes. Abby Leefer 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 organization bills Medicare for Abby Leefer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Abby Leefer reassigns Medicare benefits to Abby Leefer, Licensed Clinical Social Worker, PC (Port Jefferson, 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 Abby Leefer'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 Abby Leefer was last updated on September 4, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Ms. Abby Rachel Leefer, LCSW · NPI 1003888413
Clinical provider in Port Jefferson, New York. Individual provider, active in the CMS NPPES registry since February 2, 2006.
## Identity
- **NPI:** 1003888413 (Entity type: Individual)
- **Enumerated:** February 2, 2006
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** R042715-1 (New York)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 35 PURITAN PATH, Port Jefferson, NY 11777-1456
- **Phone:** (631) 928-9808 · **Fax:** (631) 928-9808
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Abby Leefer, Licensed Clinical Social Worker, PC (NPI 1417575721, Port Jefferson, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1989
## Record status
- **NPPES last updated:** September 4, 2013
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Source: [NPI Profile](https://npiprofile.com/npi/1003888413) · Data from the CMS NPPES public registry.