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

Individual provider Internal Medicine Physician · NPI 1447388442

Nancy Formosan Tsai, MD is an Internal Medicine in Portland, Oregon. Qualified in 1997, 29 years ago. Practices with Kaiser Foundation Health Plan of the Northwest, a 1,811-clinician group and accepts Medicare assignment. Licensed in Oregon.

Years since qualifying
29
Licensed in
OR
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

10000 SE Main St Ste 200
Portland, OR 97216-2448
Phone: (503) 261-6985
Fax: (503) 261-6790
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD27242 (OR)

Record details

NPI number1447388442
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 1, 2007
Last updated in NPPESDecember 4, 2008
Mailing address10000 Se Main St, Suite 205, Portland, OR 97216-2448

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1997 (29 years in practice)
Group practice Kaiser Foundation Health Plan Of The Northwest — 1811 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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