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

Grete Hemmingsen Porteous, MD

Individual provider Anesthesiology Physician · NPI 1649210295

Grete Hemmingsen Porteous, MD practises Anesthesiology in Seattle, Washington. Graduated from University of California, San Francisco School of Medicine in 2000, 26 years ago. Practices with Valley Anesthesia Associates PLLC, a 47-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California and Washington.

Years since qualifying
26
Trained at
University of California, San Francisco School of Medicine
Licensed in
CA, WA
In the registry since
2006
Specialties on file
2
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

1100 9th Ave
Seattle, WA 98101-2756
Phone: (206) 223-6980
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1717 S J Street, Tacoma, WA 98405 — (253) 985-6403

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence MD60170125 (WA)
Anesthesiology Physician Taxonomy 207L00000X · Licence A76493 (CA)

Record details

NPI number1649210295
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 8, 2006
Last updated in NPPESFebruary 19, 2024
Certification dateFebruary 19, 2024

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, SAN FRANCISCO SCHOOL OF MEDICINE
Graduated 2000 (26 years in practice)
Group practice Valley Anesthesia Associates Pllc — 47 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients65
Services billed 68 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.

  • Valley Medical Center Hospital · Renton, WA

Colleagues at Valley Anesthesia Associates PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 47 clinicians in the practice; 12 are shown here.

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