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

Dr. Mark Walter Layton, MD

Individual provider Internal Medicine Physician · NPI 1891846077

Dr. Mark Walter Layton, MD is a Rheumatology in Olympia, Washington. Graduated from University of Washington School of Medicine in 1982, 44 years ago. Accepts Medicare assignment. Licensed in Washington.

Years since qualifying
44
Trained at
University of Washington School of Medicine
Licensed in
WA
In the registry since
2007
Specialties on file
3
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

1212 Harrison Ave NW
Olympia, WA 98502-5466
Phone: (360) 754-6700
Fax: (360) 754-0164
Show map & directions

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

Specialties & licences

Rheumatology Physician (primary) Taxonomy 207RR0500X · Licence MD00024518 (WA)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD00024518 (WA)
Legal Medicine Taxonomy 173000000X · Licence MD00024518 (WA)

Record details

NPI number1891846077
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 15, 2007
Last updated in NPPESJune 30, 2026
Certification dateJune 30, 2026
Mailing address1212 Harrison Ave Nw, Olympia, WA 98502-5466

Medicare enrollment

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

Medicare specialtyRHEUMATOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolUNIVERSITY OF WASHINGTON SCHOOL OF MEDICINE
Graduated 1982 (44 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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