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Active NPI 1740260306 Individual Practitioner Male Practitioner

Dr. William Michael Cassidy , MD

Pediatrics • Vienna, VA

Professional Overview & Biography Verified Profile Summary

Dr. William Cassidy, MD is a registered healthcare professional specializing in Pediatrics in Vienna, VA. Practice services are available at 410 MAPLE AVE W under active NPI credentials.

Practice Location & Contact Primary Location

Practice Address

410 Maple Ave W
5

Vienna, VA 22180

Telephone 7039382244
Fax 7039383669
Associated Practice Facility / Clinic
🏢 Virginia Gynecologists, Ltd Facility NPI 1962438119

Specialty Benchmarks & Practice Insights

Comparative analytics for Pediatrics in Vienna, VA

Active Practitioner
Practitioner Clinical Experience
Active
City Avg: 10.5 Yrs
State Avg: 20.6 Yrs
Regional Practice Density
20 Specialists

Practicing in Vienna, VA (2079 Statewide)

Telehealth Adoption Rate
0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount
67.4% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Medical Specialties & State Licenses

Pediatrics Primary Specialty

NUCC Taxonomy Code: 208000000X

State License VA 0101026293

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.

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

12 Associated Practitioners
Peggy Thurston , CPNP

Nurse Practitioner

NPI 1023077260

Certified Pediatric Nurse Practitioner

NPI 1053391540

Doctor of Medicine (M.D.)

NPI 1144292632

Doctor of Medicine (M.D.)

NPI 1164957825

Doctor of Medicine (M.D.)

Lisa Reynolds , FNP

Nurse Practitioner

NPI 1215996277

Family Nurse Practitioner

NPI 1356321830

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events
NPI Profile Active July 08, 2007

NPI status registered as active in NPPES database

📍
Updated Practice Location July 08, 2007

Registered at 410 MAPLE AVE W, 5, VIENNA, VA 22180 (Tel: 7039382244)

📍
Updated Business Mailing Address July 08, 2007

Registered at 10400 EATON PL, 410, FAIRFAX, VA 22030 (Tel: 7033595160)

👤
Provider Name / Credentials Updated July 08, 2007

Recorded as WILLIAM CASSIDY, MD

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) July 08, 2007

Pediatrics (License #0101026293 in VA)

🟢
Initial NPI Registration & Enumeration January 19, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1740260306
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: January 19, 2006
Last Update: July 13, 2026
Sole Proprietor: No

Mailing Address

10400 Eaton Pl, 410

Fairfax, VA 22030

Phone: 7033595160

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).
⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.