WILLIAM CARL STALLARD M.D.
NPI 1740694561
Family Medicine in Fairfax, VA
About William Carl Stallard M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM CARL STALLARD M.D. (NPI 1740694561) is an individual family medicine provider in Fairfax, Virginia, licensed in Virginia (0116027266) and active in the NPI registry since June 2014. He is enrolled in Medicare PECOS and is a graduate of Virginia Commonwealth University, School Of Medicine (2014).
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
William Carl Stallard 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.
Medicare Billing Reassignments
2Medicare enrollment records show William Stallard reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fairfax, VA 22033
- Reassigned Medicare billing, District of Columbia, Virginia and Maryland enrollments
- Also billed through NPI 1699893537 (Virginia), NPI 1285752121 (Maryland)
- 2,492 clinicians in this Medicare group
Arlington, VA 22203
- Reassigned Medicare billing, District of Columbia enrollment
- 1,534 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 3
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 22033 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
FAIRFAX, VA 22033
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 Stallard's NPI number?
The NPI number for William Stallard is 1740694561. It was assigned to this individual provider in the NPPES registry on June 19, 2014.
Where is William Stallard located?
William Stallard practices at 3650 Joseph Siewick Dr Suite 400, Fairfax, VA 22033. The listed phone number is (703) 391-2020.
What is William Stallard's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is William Stallard enrolled in Medicare?
Yes. William Stallard 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 William Stallard's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Stallard reassigns Medicare benefits to 2 organizations: Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc (Fairfax, VA) and Privia Medical Group, LLC (Arlington, 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 William Stallard'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 William Stallard was last updated on May 31, 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.
# William Carl Stallard, M.D. · NPI 1740694561
Family Medicine physician in Fairfax, Virginia. Individual provider, active in the CMS NPPES registry since June 19, 2014.
## Identity
- **NPI:** 1740694561 (Entity type: Individual)
- **Enumerated:** June 19, 2014
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 0116027266 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** 3650 JOSEPH SIEWICK DR, SUITE 400, Fairfax, VA 22033-1710
- **Phone:** (703) 391-2020
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc (NPI 1215058326, Fairfax, VA); Privia Medical Group, LLC (NPI 1013042480, Arlington, VA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Virginia Commonwealth University, School Of Medicine, class of 2014
## Record status
- **NPPES last updated:** May 31, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1740694561) · Data from the CMS NPPES public registry.