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

Sophia Mansfield Swanson, MD

Individual provider Gastroenterology Physician · NPI 1831498203

Sophia Mansfield Swanson, MD practises Gastroenterology in Seattle, Washington. Graduated from University of California, San Francisco School of Medicine in 2011, 15 years ago. Practices with Kaiser Foundation Health Plan of Washington, a 1,519-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
15
Trained at
University of California, San Francisco School of Medicine
Licensed in
WA
In the registry since
2011
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

125 16th Ave
Seattle, WA 98122
Phone: (206) 326-3000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 505 Parnassus Ave, San Francisco, CA 94143-0119 — (917) 657-0448

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 60542275 (WA)

Record details

NPI number1831498203
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 24, 2011
Last updated in NPPESMay 4, 2021
Certification dateMay 4, 2021

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, SAN FRANCISCO SCHOOL OF MEDICINE
Graduated 2011 (15 years in practice)
Group practice Kaiser Foundation Health Plan Of Washington — 1519 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 1–10 times
Upper gastrointestinal (GI) endoscopy for acid reflux 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Colleagues at Kaiser Foundation Health Plan of Washington

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1519 clinicians in the practice; 12 are shown here.

Other providers in Seattle