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DR. JENNIFER BROWN O'NEIL MD
NPI 1548427271
Pediatrics - Pediatric Cardiology in Fairfax, VA

Active since May 20, 2008PECOS Enrolled
81.28/100
CMS Quality Rating
8260 WILLOW OAKS CORPORATE DR STE 400, FAIRFAX, VA 22031(703) 573-0504(703) 573-4856 Get Directions Write a Review

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

Record update history: May 5, 2026, Apr 17, 2026, Apr 26, 2022 and 1 more (4 updates tracked since 2021).

About Dr. Jennifer Brown O'neil Md NPPES

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

DR. JENNIFER BROWN O'NEIL MD (NPI 1548427271) is an individual pediatric cardiology provider in Fairfax, Virginia, licensed in Virginia (0101250398) and active in the NPI registry since May 2008. She is enrolled in Medicare PECOS and maintains a secondary practice location in Fairfax.

NPPES Registry Identity

NPI1548427271
Entity TypeIndividualFemale
Primary Taxonomy2080P0202X
Provider Legal NameDR. JENNIFER BROWN O'NEILCredential: MD
Location Address8260 WILLOW OAKS CORPORATE DR STE 400Fairfax, VA 22031-4513
Mailing AddressPo Box 37174Baltimore, MD 21297-3174 · (571) 423-5699 · Fax (571) 423-5698
Phone(703) 573-0504
Fax(703) 573-4856
Sole ProprietorNo
Enumeration DateMay 20, 2008
Last NPPES UpdateMay 5, 20264 updates tracked since enumeration
NPPES CertifiedMay 5, 2026
✔ NPI 1548427271 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPediatrics · Pediatric CardiologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0202X
License✔ Licensed in VA · 0101250398
Definition
A pediatric cardiologist provides comprehensive care to patients with cardiovascular problems. This specialist is skilled in selecting, performing and evaluating the structural and functional assessment of the heart and blood vessels, and the clinical evaluation of cardiovascular disease.
Also ListedPediatricsTaxonomy 208000000X · License 0101250398 (VA)
8260 WILLOW OAKS CORPORATE DR STE 400, Fairfax, VA 22031
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Other Names 1

Former Name (1)Dr. Jennifer Lynn Brown Md

Secondary Practice Location 1

Location 18260 Willow Oaks Corporate Dr Ste 625Fairfax, VA 22031-4513 · Phone (703) 573-0504 · Fax (571) 573-4856

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Jennifer Brown O'neil Md 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 Reassignments

2

Medicare enrollment records show Jennifer O'neil reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Inova Health Care Services
0.5 mi
Internal Medicine
3300 GALLOWS RD, PHYSICIAN SERVICES
Falls Church, VA 22042
  • Reassigned Medicare billing, District of Columbia and Virginia enrollments
  • Also billed through NPI 1588717755 (Virginia)
  • 2,618 clinicians in this Medicare group
NPI 1952320061 (703) 321-2627
Adventist Physician Services, Inc.
19 mi
Physical Medicine & Rehabilitation
820 WEST DIAMOND AVENUE
Gaithersburg, MD 20878
  • Reassigned Medicare billing, District of Columbia enrollment
  • 340 clinicians in this Medicare group
NPI 1376623207 (301) 315-3826

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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.

81.28/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality70.77
Promoting Interoperability100
Improvement Activities40
Cost66.84

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.

KRISTEN ELIZABETH BARBIERI PA-C
Physician Assistant
8260 WILLOW OAKS CORPORATE DR STE 400
FAIRFAX, VA 22031
Fairfax County (703) 573-0504
KINJAL PARIKH MD
Pediatrics (Pediatric Cardiology)
8260 WILLOW OAKS CORPORATE DR STE 400
FAIRFAX, VA 22031
Fairfax County (703) 573-0504
DR. HARISH SITARAM RUDRA D.O.
Pediatrics (Pediatric Cardiology)
8260 WILLOW OAKS CORPORATE DR STE 400
FAIRFAX, VA 22031
Fairfax County (703) 573-0504
SHERIF S TAWFIK M.D.
Pediatrics (Pediatric Cardiology)
8260 WILLOW OAKS CORPORATE DR STE 400
FAIRFAX, VA 22031
Fairfax County (703) 573-0504
JENNIFER H LINDSEY M.D.
Pediatrics (Pediatric Cardiology)
8260 WILLOW OAKS CORPORATE DR STE 400
FAIRFAX, VA 22031
Fairfax County (703) 573-0504
MARC DELANEY MD
Pediatrics (Pediatric Cardiology)
8260 WILLOW OAKS CORPORATE DR STE 400
FAIRFAX, VA 22031
Fairfax County (703) 573-0504
DR. HIRAL SHAH MD
Pediatrics
8260 WILLOW OAKS CORPORATE DR STE 400
FAIRFAX, VA 22031
Fairfax County (703) 573-0504
PATRICK F CALLAHAN M.D.
Pediatrics (Pediatric Cardiology)
8260 WILLOW OAKS CORPORATE DR STE 400
FAIRFAX, VA 22031
Fairfax County (703) 573-0504

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 Jennifer O'neil's NPI number?

The NPI number for Jennifer O'neil is 1548427271. It was assigned to this individual provider in the NPPES registry on May 20, 2008. The provider is also known as Dr. Jennifer Lynn Brown MD.

Where is Jennifer O'neil located?

Jennifer O'neil practices at 8260 Willow Oaks Corporate Dr Ste 400, Fairfax, VA 22031. The listed phone number is (703) 573-0504.

What is Jennifer O'neil's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Cardiology, with taxonomy code 2080P0202X.

Is Jennifer O'neil enrolled in Medicare?

Yes. Jennifer O'neil is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Jennifer O'neil's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Jennifer O'neil reassigns Medicare benefits to 2 organizations: Inova Health Care Services (Falls Church, VA) and Adventist Physician Services, Inc. (Gaithersburg, MD). 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 Jennifer O'neil's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Jennifer O'neil accept?

Health plans from Oscar Health list Jennifer O'neil 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 Jennifer O'neil was last updated on May 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.