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

Dr. Mark J Den Hartog, DC

Individual provider Chiropractor · NPI 1023081155

Dr. Mark J Den Hartog, DC is a Chiropractic in Eugene, Oregon. Graduated from Northwestern College of Chiropractic in 1992, 34 years ago. Practices as a sole proprietor and works from 4 locations. Licensed in Oregon and Washington.

Years since qualifying
34
Trained at
Northwestern College of Chiropractic
Licensed in
OR, WA
In the registry since
2006
Specialties on file
2
What do these letters mean?
DC — Doctor of Chiropractic
A licensed chiropractor.

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Practice location Address checks out

225 E 4th Ave
Eugene, OR 97401-2429
Phone: (541) 762-4807
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 114 1/2 E Monroe, Pleasantville, IA 50225-7744 — (515) 848-3334
  • 114 1/2 E Monroe, Pleasantville, IA 50225-7744 — (515) 848-3334
  • 1018 7th Ave Se, Olympia, WA 98501-1512 — (360) 459-8114

Specialties & licences

Chiropractor (primary) Taxonomy 111N00000X · Licence 6485 (OR)
Chiropractor Taxonomy 111N00000X · Licence 60741817 (WA)

Record details

NPI number1023081155
Entity typeIndividual (Type 1)
GenderMale
Credentials DC
Sole proprietorYes
NPI enumeratedFebruary 9, 2006
Last updated in NPPESJune 24, 2026
Certification dateJune 24, 2026

Medicare enrollment

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

Medicare specialtyCHIROPRACTIC
Medical schoolNORTHWESTERN COLLEGE OF CHIROPRACTIC
Graduated 1992 (34 years in practice)
Accepts Medicare assignment Not indicated
Practice locations2 on file with Medicare

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