Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Michael Sean Antonis, DO

Individual provider Emergency Medicine Physician · NPI 1760429476

Dr. Michael Sean Antonis, DO practises Emergency Medicine in Ashburn, Virginia. Graduated from Chicago College of Osteopathy in 2003, 23 years ago. Practices with Orthovirginia Inc, a 570-clinician group and accepts Medicare assignment. Licensed in District of Columbia and Virginia.

Years since qualifying
23
Trained at
Chicago College of Osteopathy
Licensed in
DC, VA
In the registry since
2006
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

20041 Riverside Commons Plz
Ashburn, VA 20147
Phone: (703) 466-0447
Fax: (703) 810-5313
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Sports Medicine (Emergency Medicine) Physician (primary) Taxonomy 207PS0010X · Licence 0102204828 (VA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence DO034203 (DC)

Record details

NPI number1760429476
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 1, 2006
Last updated in NPPESApril 13, 2023
Certification dateApril 13, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Also practisesSPORTS MEDICINE
Medical schoolCHICAGO COLLEGE OF OSTEOPATHY
Graduated 2003 (23 years in practice)
Group practice Orthovirginia Inc — 570 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients522
Services billed 8,805 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Orthovirginia Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 570 clinicians in the practice; 12 are shown here.