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

Ritchie Allen Larson, MD

Individual provider Anesthesiology Physician · NPI 1235280462

Ritchie Allen Larson, MD is an Anesthesiology in Seattle, Washington. Graduated from University of Chicago, Pritzker School of Medicine in 1992, 34 years ago. Practices with Physicians Anesthesia Service PLLC, a 186-clinician group and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
34
Trained at
University of Chicago, Pritzker School of Medicine
Licensed in
WA
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

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 MD00032132 (WA)

Record details

NPI number1235280462
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 15, 2007
Last updated in NPPESApril 14, 2008

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolUNIVERSITY OF CHICAGO, PRITZKER SCHOOL OF MEDICINE
Graduated 1992 (34 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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