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

Dr. Alfonso Oliva Tan, MD

Individual provider Internal Medicine Physician · NPI 1407085210

Dr. Alfonso Oliva Tan, MD is an Internal Medicine Physician in Winchester, Oregon. Practices as a sole proprietor. Licensed in Oregon.

Licensed in
OR
In the registry since
2009
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

305 Thora Circle Dr
Winchester, OR 97495
Phone: (541) 673-4516
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD13317 (OR)

Record details

NPI number1407085210
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 14, 2009
Last updated in NPPESJuly 14, 2009