ELLEN BRYN BRENNAN NP
NPI 1821729039
Nurse Practitioner - Adult Health in Wilmington, DE
About Ellen Bryn Brennan Np NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELLEN BRYN BRENNAN NP (NPI 1821729039) is an individual adult health provider in Wilmington, Delaware, licensed in Pennsylvania (SP025575) and active in the NPI registry since June 2022. She is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (2022).
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Secondary Practice Locations 3
Accepted Insurance
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
Ellen Bryn Brennan Np 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
6Medicare enrollment records show Ellen Brennan reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Wayne, PA 19087
- Reassigned Medicare billing, Pennsylvania enrollment
- 43 clinicians in this Medicare group
Middletown, DE 19709
- Reassigned Medicare billing, Delaware enrollment
- 18 clinicians in this Medicare group
Seaford, DE 19973
- Reassigned Medicare billing, Delaware enrollment
- 19 clinicians in this Medicare group
Taunton, MA 02780
- Reassigned Medicare billing, Massachusetts enrollment
- 76 clinicians in this Medicare group
Mount Olive, NC 28365
- Reassigned Medicare billing, North Carolina enrollment
- 12 clinicians in this Medicare group
Naperville, IL 60563
- Reassigned Medicare billing, Connecticut, Delaware, North Carolina and Pennsylvania enrollments
- 100 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 10
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 19809 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 15
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WILMINGTON, DE 19809
WILMINGTON, DE 19809
WILMINGTON, DE 19809
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 Ellen Brennan's NPI number?
The NPI number for Ellen Brennan is 1821729039. It was assigned to this individual provider in the NPPES registry on June 19, 2022. The provider is also known as Ellen Bryn Baker.
Where is Ellen Brennan located?
Ellen Brennan practices at 405 Silverside Rd Ste 104, Wilmington, DE 19809. The listed phone number is (844) 365-7246.
What is Ellen Brennan's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Adult Health, with taxonomy code 363LA2200X.
Is Ellen Brennan enrolled in Medicare?
Yes. Ellen Brennan 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 Ellen Brennan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Brennan reassigns Medicare benefits to 6 organizations: Visavis Health Care Medical Group Of Pennsylvania PLLC (Wayne, PA), Center For Interventional Pain Spine LLC (Middletown, DE), Visavis Health Care Medical Group Of De PA (Seaford, DE), Post Acute Specialists Of Massachusetts PLLC (Taunton, MA), Visavis Health Care Medical Group Of Nc PLLC (Mount Olive, NC) and 1 more organization, listed in the Medicare section above. 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 Ellen Brennan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ellen Brennan accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Ambetter from Buckeye Health Plan list Ellen Brennan as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Ellen Brennan was last updated on September 12, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Ellen Bryn Brennan, NP · NPI 1821729039
Adult Health physician in Wilmington, Delaware. Individual provider, active in the CMS NPPES registry since June 19, 2022.
## Identity
- **NPI:** 1821729039 (Entity type: Individual)
- **Enumerated:** June 19, 2022
- **Primary specialty:** Nurse Practitioner - Adult Health · taxonomy 363LA2200X
- **State license:** SP025575 (Pennsylvania)
- **Sole proprietor:** No
## Practice location
- **Address:** 405 SILVERSIDE RD STE 104, Wilmington, DE 19809-1768
- **Phone:** (844) 365-7246 · **Fax:** (302) 792-1372
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Visavis Health Care Medical Group Of Pennsylvania PLLC (NPI 1619688132, Wayne, PA); Center For Interventional Pain Spine LLC (NPI 1144527003, Middletown, DE); Visavis Health Care Medical Group Of De PA (NPI 1164284048, Seaford, DE); Post Acute Specialists Of Massachusetts PLLC (NPI 1104438480, Taunton, MA); Visavis Health Care Medical Group Of Nc PLLC (NPI 1861274607, Mount Olive, NC); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2022
## Record status
- **NPPES last updated:** September 12, 2023
---
Source: [NPI Profile](https://npiprofile.com/npi/1821729039) · Data from the CMS NPPES public registry.