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WILLIAM C KIRBY M.D.
NPI 1528021755
Pediatrics - Pediatric Cardiology in Fairfax, VA

Active since April 10, 2006PECOS EnrolledAccepts Medicare Assignment
81.28/100
CMS Quality Rating
8318 ARLINGTON BLVD, SUITE 250, FAIRFAX, VA 22031(703) 876-8410(703) 876-8417 Get Directions Write a Review

NPPES record last updated: July 14, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About William C Kirby M.d. NPPES

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

WILLIAM C KIRBY M.D. (NPI 1528021755) is an individual pediatric cardiology provider in Fairfax, Virginia, licensed in Virginia (0101039869) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Falls Church, and is a graduate of Indiana University School Of Medicine (1975).

NPPES Registry Identity

NPI1528021755
Entity TypeIndividualMale
Primary Taxonomy2080P0202X
Provider Legal NameWILLIAM C KIRBYCredential: M.D.
Location Address8318 ARLINGTON BLVD, SUITE 250Fairfax, VA 22031-5218
Mailing Address8318 Arlington Blvd, Suite 250Fairfax, VA 22031-5218 · (703) 876-8410 · Fax (703) 876-8417
Phone(703) 876-8410
Fax(703) 876-8417
Sole ProprietorNo
Medical School CMSIndiana University School Of MedicineGraduated 1975
Enumeration DateApril 10, 2006
Last NPPES UpdateJuly 14, 2021
NPPES CertifiedJuly 14, 2021
✔ NPI 1528021755 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric CardiologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0202X
Licenses✔ Licensed in VA · 0101039869✔ Licensed in DC · MD10635✔ Licensed in MD · D34047
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.
8318 ARLINGTON BLVD, Fairfax, VA 22031
Open in Google Maps ↗

Secondary Practice Location 1

Location 13300 Gallows RdFalls Church, VA 22042-3300 · Phone (703) 776-4001 · Fax (703) 776-7113

Other Identifiers 2

Medicaid006707092VA
Medicaid311641700MD

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 and accepts Medicare assignment

William C Kirby M.d. 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.

PECOS PAC ID3274527106
PECOS Enrollment IDI20060105000505
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 William Kirby reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Inova Health Care Services
0.7 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

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 8

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

RICHARD R. ROSENTHAL, MD, LTD
Allergy & Immunology (Allergy)
8318 ARLINGTON BLVD, SUITE #308
FAIRFAX, VA 22031
Fairfax County (703) 573-4440
FAIRFAX RADIOLOGICAL CONSULTANTS PC
Specialist
8318 ARLINGTON BLVD, STE 200
FAIRFAX, VA 22031
Fairfax County (703) 698-4483
FAIRFAX RADIOLOGICAL CONSULTANTS PC
Specialist
8318 ARLINGTON BLVD, SUITE 100
FAIRFAX, VA 22031
Fairfax County (703) 698-4483
LORIE SHORA NP
Nurse Practitioner (Family)
8318 ARLINGTON BLVD, #308
FAIRFAX, VA 22031
Fairfax County (703) 573-4440
SAID ALI, M.D., P.C.
Obstetrics & Gynecology
8318 ARLINGTON BLVD, SUITE 204
FAIRFAX, VA 22031
Fairfax County (301) 705-7200
RADHA R COHEN M.D.
Pediatrics (Pediatric Cardiology)
8318 ARLINGTON BLVD, SUITE 250
FAIRFAX, VA 22031
Fairfax County (703) 876-8410
DR. FRANK MARTIN GALIOTO JR. M.D.
Pediatrics (Pediatric Cardiology)
8318 ARLINGTON BLVD, SUITE 250
FAIRFAX, VA 22031
Fairfax County (703) 876-8410
DR. RICHARD R. ROSENTHAL M.D.
Allergy & Immunology (Allergy)
8318 ARLINGTON BLVD, SUITE #308
FAIRFAX, VA 22031
Fairfax County (703) 573-4440

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 William Kirby's NPI number?

The NPI number for William Kirby is 1528021755. It was assigned to this individual provider in the NPPES registry on April 10, 2006.

Where is William Kirby located?

William Kirby practices at 8318 Arlington Blvd Suite 250, Fairfax, VA 22031. The listed phone number is (703) 876-8410.

What is William Kirby's specialty?

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

Is William Kirby enrolled in Medicare?

Yes. William Kirby 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 William Kirby's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Kirby reassigns Medicare benefits to Inova Health Care Services (Falls Church, VA). 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 William Kirby's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Kirby accept?

Health plans from Oscar Health list William Kirby 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 William Kirby was last updated on July 14, 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.