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KATHARINE ELIZABETH WALLEN M.D.
NPI 1881811594
Pediatrics in Falls Church, VA

Active since April 20, 2007PECOS Enrolled
3300 GALLOWS RD, FALLS CHURCH, VA 22042(703) 776-4001(703) 776-7113 Get Directions Write a Review

NPPES record last updated: February 25, 2021. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Katharine Elizabeth Wallen M.d. NPPES

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

KATHARINE ELIZABETH WALLEN M.D. (NPI 1881811594) is an individual pediatrics provider in Falls Church, Virginia, licensed in Virginia (0101248550) and active in the NPI registry since April 2007. She is enrolled in Medicare PECOS and maintains a secondary practice location in Manassas.

NPPES Registry Identity

NPI1881811594
Entity TypeIndividualFemale
Primary Taxonomy208000000X
Provider Legal NameKATHARINE ELIZABETH WALLENCredential: M.D.
Location Address3300 GALLOWS RDFalls Church, VA 22042-3307
Mailing Address3300 Gallows RdFalls Church, VA 22042-3307 · (703) 776-4001 · Fax (703) 776-7113
Phone(703) 776-4001
Fax(703) 776-7113
Sole ProprietorYes
Enumeration DateApril 20, 2007
Last NPPES UpdateFebruary 25, 2021
NPPES CertifiedFebruary 25, 2021
✔ NPI 1881811594 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in VA · 0101248550
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
3300 GALLOWS RD, Falls Church, VA 22042
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Secondary Practice Location 1

Location 19430 Forestwood Ln, Suite 100Manassas, VA 20110-4753 · Phone (703) 365-0227

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)

Katharine Elizabeth Wallen M.d. 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

3

Medicare enrollment records show Katharine Wallen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Inova Health Care Services
Same address
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
Privia Medical Group, LLC
6.2 mi
Internal Medicine
950 N GLEBE RD STE 700
Arlington, VA 22203
  • Reassigned Medicare billing, Virginia enrollment
  • 1,315 clinicians in this Medicare group
NPI 1013042480 (571) 366-8850
Commonwealth Emergency Physicians PC
20 mi
Emergency Medicine
44045 RIVERSIDE PARKWAY, LOUDOUN HOSPITAL CENTER
Leesburg, VA 20176
  • Reassigned Medicare billing, Virginia enrollment
  • 103 clinicians in this Medicare group
NPI 1598723082 (703) 858-6040

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 22042 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
$100.31 typical visit price
range $65.18 – $194.86
Typical copayment $25.07 (range $16.29 – $48.71)
Most-billed visit code 99203
Established Patient
$113.72 typical visit price
range $21.40 – $158.88
Typical copayment $28.43 (range $5.35 – $39.72)
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.

ALLISON ELIZABETH TWEEDIE MD
Psychiatry & Neurology (Psychiatry)
3300 GALLOWS RD
FALLS CHURCH, VA 22042
Fairfax County (703) 776-4001
DR. OLEG DOLGHI M.D
Obstetrics & Gynecology
3300 GALLOWS RD
FALLS CHURCH, VA 22042
Fairfax County (703) 776-4001
MRS. CHERYL ANNE FRASER NP
Nurse Practitioner (Acute Care)
3300 GALLOWS RD
FALLS CHURCH, VA 22042
Fairfax County (703) 776-4132
MISS CRYSTAL FALKE PA-C
Physician Assistant
3300 GALLOWS RD
FALLS CHURCH, VA 22042
Fairfax County (703) 776-3281
EMERGENCY MEDICINE ASSOCIATES
Physician Assistant
3300 GALLOWS RD
FALLS CHURCH, VA 22042
Fairfax County (703) 776-4002
NARGES NAJMYAR PA-C
Physician Assistant
3300 GALLOWS RD
FALLS CHURCH, VA 22042
Fairfax County (703) 970-2670
SARAH MARAKOS DO
Pediatrics
3300 GALLOWS RD
FALLS CHURCH, VA 22042
Fairfax County (703) 776-6652
KARA STONE YOUNG CRNA
Nurse Anesthetist, Certified Registered
3300 GALLOWS RD
FALLS CHURCH, VA 22042
Fairfax County (703) 776-4001

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 Katharine Wallen's NPI number?

The NPI number for Katharine Wallen is 1881811594. It was assigned to this individual provider in the NPPES registry on April 20, 2007.

Where is Katharine Wallen located?

Katharine Wallen practices at 3300 Gallows Rd, Falls Church, VA 22042. The listed phone number is (703) 776-4001.

What is Katharine Wallen's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Katharine Wallen enrolled in Medicare?

Yes. Katharine Wallen is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Katharine Wallen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Katharine Wallen reassigns Medicare benefits to 3 organizations: Inova Health Care Services (Falls Church, VA), Privia Medical Group, LLC (Arlington, VA) and Commonwealth Emergency Physicians PC (Leesburg, VA). 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 Katharine Wallen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Katharine Wallen accept?

Health plans from Oscar Health list Katharine Wallen 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 Katharine Wallen was last updated on February 25, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.