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

Mark R Thorson, MD

Individual provider Internal Medicine Physician · NPI 1609877141

Mark R Thorson, MD is an Internal Medicine Physician in Longview, Washington. Licensed in Washington. Registered with an NPI since 2005.

Licensed in
WA
In the registry since
2005
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

1615 Delaware St
Longview, WA 98632-2367
Phone: (360) 501-3601
Fax: (360) 501-3648
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 MD00015441 (WA)

Record details

NPI number1609877141
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 9, 2005
Last updated in NPPESJuly 30, 2012
Mailing addressPo Box 3002, Longview, WA 98632-0302

Other providers in Longview