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

Alyssa L McGregor, MD

Individual provider Anesthesiology Physician · NPI 1255865945

Alyssa L McGregor, MD practises Anesthesiology in Seattle, Washington. Graduated from University of Arizona College of Medicine in 2017, 9 years ago. Practices with Matrix Anesthesia, Ps, a 87-clinician group and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
9
Trained at
University of Arizona College of Medicine
Licensed in
WA
In the registry since
2017
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

1959 NE Pacific St
Seattle, WA 98195-6540
Phone: (206) 520-5000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence MD61162810 (WA)

Record details

NPI number1255865945
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 19, 2017
Last updated in NPPESMay 3, 2021
Certification dateMay 3, 2021

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolUNIVERSITY OF ARIZONA COLLEGE OF MEDICINE
Graduated 2017 (9 years in practice)
Group practice Matrix Anesthesia, Ps — 87 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 patients138
Services billed 163 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 Matrix Anesthesia, Ps

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 87 clinicians in the practice; 12 are shown here.

Other providers in Seattle