Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Jason B Guillian, MD

Individual provider Anesthesiology Physician · NPI 1295927515

Jason B Guillian, MD practises Anesthesiology in Washington, District of Columbia. Graduated from University of South Carolina School of Medicine in 1999, 27 years ago. Practices with Medstar Medical Group II LLC, a 3,717-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in District of Columbia.

Years since qualifying
27
Trained at
University of South Carolina School of Medicine
Licensed in
DC
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3800 Reservoir Rd NW
Washington, DC 20007-2196
Phone: (202) 444-1301
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 110 Irving St Nw, Washington, DC 20010-3017 — (301) 946-5100

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence MD036838 (DC)

Record details

NPI number1295927515
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 10, 2007
Last updated in NPPESJune 17, 2024
Certification dateJune 17, 2024

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolUNIVERSITY OF SOUTH CAROLINA SCHOOL OF MEDICINE
Graduated 1999 (27 years in practice)
Group practice Medstar Medical Group Ii Llc — 3717 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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 patients185
Services billed 310 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

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 Medstar Medical Group II LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3717 clinicians in the practice; 12 are shown here.

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