Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MARK J DEN HARTOG DC
NPI 1023081155
Chiropractor in Eugene, OR

Q: What is Mark Den Hartog's NPI number?

The NPI number for Mark Den Hartog is 1023081155. It was assigned to this individual provider in the NPPES registry on February 9, 2006.

Q: What is Mark Den Hartog's specialty?

The primary specialty registered for this NPI is Chiropractor with taxonomy code 111N00000X.

Q: When was this NPI record last updated?

The NPPES record for Mark Den Hartog was last updated on June 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 50 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since February 09, 2006

225 E 4TH AVE, EUGENE, OR 97401(541) 762-4807 Get Directions Write a Review

NPPES record last updated: June 24, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Dr. Mark J Den Hartog Dc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARK J DEN HARTOG DC (NPI 1023081155) is an individual chiropractor in Eugene, Oregon, licensed in Oregon (6485) and active in the NPI registry since February 2006. He maintains 2 additional practice locations and is a graduate of Northwestern College Of Chiropractic (1992).

NPPES Registry Identity

NPI1023081155

Entity TypeIndividualMale

Primary Taxonomy111N00000X

Provider Legal NameDR. MARK J DEN HARTOGCredential: DC

Location Address225 E 4TH AVEEugene, OR 97401-2429

Mailing Address225 E 4th AveEugene, OR 97401-2429 · (541) 762-4807 · Fax (541) 795-8810

Phone(541) 762-4807

Sole ProprietorYes

Medical School CMSNorthwestern College Of ChiropracticGraduated 1992

Enumeration DateFebruary 9, 2006

Last NPPES UpdateJune 24, 2026

NPPES CertifiedJune 24, 2026

✔ NPI 1023081155 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyChiropractorChiropractic Providers

Taxonomy Code111N00000X

Licenses✔ Licensed in OR · 6485✔ Licensed in WA · 60741817

Definition

A provider qualified by a Doctor of Chiropractic (D.C.), licensed by the State and who practices chiropractic medicine -that discipline within the healing arts which deals with the nervous system and its relationship to the spinal column and its interrelationship with other body systems.

225 E 4TH AVE, Eugene, OR 97401

Open in Google Maps ↗

Secondary Practice Locations 2

Location 1114 1/2 E MonroePleasantville, IA 50225-7744 · Phone (515) 848-3334 · Fax (515) 848-3355

Location 21018 7th Ave SEOlympia, WA 98501-1512 · Phone (360) 459-8114 · Fax (360) 493-8742

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mark J Den Hartog Dc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID7618910738

PECOS Enrollment IDI20251209004243

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

UMPQUA CHIROPRACTIC PC

Chiropractor (Rehabilitation)

225 E 4TH AVE
EUGENE, OR 97401

Lane County (541) 672-4807

ASPEN INJURY CENTER LLC

Chiropractor

225 E 4TH AVE
EUGENE, OR 97401

Lane County (541) 762-4807

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Den Hartog's NPI number?

The NPI number for Mark Den Hartog is 1023081155. It was assigned to this individual provider in the NPPES registry on February 9, 2006.

Where is Mark Den Hartog located?

Mark Den Hartog practices at 225 E 4th Ave, Eugene, OR 97401. The listed phone number is (541) 762-4807.

What is Mark Den Hartog's specialty?

The primary specialty registered for this NPI is Chiropractor with taxonomy code 111N00000X.

Is Mark Den Hartog enrolled in Medicare?

Yes. Mark Den Hartog is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Mark Den Hartog was last updated on June 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 50 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.