William Michael Cassidy, MD
Pediatrics Physician · Vienna, VA
William Michael Cassidy, MD is a pediatrics physician with a practice address in Vienna, Virginia, and NPI 1740260306, issued on Jan 19, 2006. Check the license (Virginia 0101026293, as entered in NPPES) on the Virginia Department of Health Professions; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- William Michael Cassidy
- Credential
- MD
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- 0101026293 VA
Self-reported in NPPES; status is on the state search - Practice location
- 410 Maple Ave W, Vienna, VA 22180
- Phone
- (703) 938-2244
- Enumerated
- Jan 19, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (703) 938-3669
- Entity
- Type 1 · individual
8 nearest pediatrics physician records → All 2,002 in Virginia → Look up another NPI →
Also registered at 410 Maple Ave W
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Aaron Lopata, MDPediatrics Physician1144292632
- Wendy Snyder, MSSpecialist1023224094
- Jackie Stout, LCSWClinical Social Worker1518280536
- Peggy Thurston, CPNPNurse Practitioner1023077260
Verify William Michael Cassidy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101026293Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
William Michael Cassidy among 2,002 pediatrics physician records in Virginia
William Michael Cassidy, MD is one of 2,002 pediatrics physician records with a practice address in Virginia. 32% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 48% newer
- In a Medicare fileNo · 32% of these records are
- In the CMS Doctors and Clinicians fileNo · 7% of these records are
- Record last updated2026 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208000000X and a Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
17 pediatrics physician records list a practice address in Vienna
They are 17 of the 1,554 NPPES records with a practice address in Vienna, and 2,002 pediatrics physician records in Virginia. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 2,002 in Virginia → Every provider in Vienna → Pediatrics Physician nationwide →
The 8 pediatrics physician records with the nearest ZIP codes
- Angela BellVienna, VA 221801538694906
- Carol Fox, M.D.Vienna, VA 221801750361010
- Katelynn Hillman, MDVienna, VA 221801164957825
- Aaron Lopata, MDVienna, VA 221801144292632
- Julie McAndrews, M.D.Vienna, VA 221801619957198
- Edward Morris, M.D.Vlenna, VA 221801356321830
- Tuc Nguyen, MDVienna, VA 221801568639847
- Christina Ulen, MDVienna, VA 221801922325380
Common questions
What is William Michael Cassidy, MD's NPI number?
William Michael Cassidy, MD's National Provider Identifier (NPI) is 1740260306, issued on Jan 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Michael Cassidy, MD located?
The NPPES record lists a practice address at 410 Maple Ave W, Vienna, VA, 22180. Phone: (703) 938-2244. Providers update this record themselves, so call before visiting.
How can I verify William Michael Cassidy, MD's license?
NPPES lists Virginia license number 0101026293, as entered by the provider. Search the Virginia Department of Health Professions at https://dhp.virginiainteractive.org/lookup/index. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.