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

Gregory B Marsh

Individual provider Anesthesiology Physician · NPI 1114952009

Gregory B Marsh is an Anesthesiology in Seattle, Washington. Graduated from University of Washington School of Medicine in 1988, 38 years ago. Practices with Physicians Anesthesia Service PLLC, a 186-clinician group and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
38
Trained at
University of Washington School of Medicine
Licensed in
WA
In the registry since
2006
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Practice location Address checks out

1229 Madison St Ste 1440
Seattle, WA 98104-3586
Phone: (206) 625-0578
Fax: (206) 625-9184
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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 MD00029703 (WA)

Record details

NPI number1114952009
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedJuly 11, 2006
Last updated in NPPESApril 15, 2008

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolUNIVERSITY OF WASHINGTON SCHOOL OF MEDICINE
Graduated 1988 (38 years in practice)
Group practice Physicians Anesthesia Service Pllc — 186 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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