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

Dr. Gary Thomas Underhill, MD

Individual provider Emergency Medicine Physician · NPI 1851375265

Dr. Gary Thomas Underhill, MD is an Emergency Medicine in Dayton, Washington. Graduated from Loma Linda University School of Medicine in 1996, 30 years ago. Practices with Columbia County Hospital District, a 57-clinician group and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
30
Trained at
Loma Linda University School of Medicine
Licensed in
WA
In the registry since
2005
Specialties on file
3
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

1012 S 3rd St
Dayton, WA 99328
Phone: (509) 382-2531
Fax: (509) 382-3205
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence MD00037711 (WA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence MD00037711 (WA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence MD0037711 (WA)

Record details

NPI number1851375265
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 30, 2005
Last updated in NPPESMarch 3, 2025
Mailing address1012 S 3rd St, Dayton, WA 99328

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolLOMA LINDA UNIVERSITY SCHOOL OF MEDICINE
Graduated 1996 (30 years in practice)
Group practice Columbia County Hospital District — 57 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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