Mark J Den Hartog, DC

Primary specialty

ChiropractorTaxonomy code 111N00000X

License

6485 Issued in OR

Practice address

225 E 4TH Ave
Eugene, OR 97401-2429

Phone

(541) 762-4807

NPI assigned

Feb 9, 2006

Last updated

Jun 24, 2026By the provider in NPPES

Sex

Male

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in OR

Enrollment records 1

Specialty

Chiropractic

Education

Northwestern College of Chiropractic, 1992

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Umpqua Chiropractic PC

  • Chiropractor
  • Roseburg, OR
  • NPI 1124644216
  Medicare reassignment NPD
• Aspen Injury Center LLC

  • Chiropractor
  • Eugene, OR
  • NPI 1952268179
  NPD (past)
• Umpqua Chiropractic PC

  • Rehabilitation Chiropractor
  • Eugene, OR
  • NPI 1528933975
  NPD (past)
• Ascherl Chiropractic Sports & Wellness Clinic LLC

  • Chiropractor
  • Winterset, IA
  • NPI 1194270314
  NPD (past)
• Central Iowa Chiropractic, LLC

  dba Baxter Chiropractic

  • Chiropractor
  • Baxter, IA
  • NPI 1144743915
  NPD (past)
• Central Iowa Chiropractic, LLC

  • Preferred Provider Organization
  • Huxley, IA
  • NPI 1477095099
  NPD (past)
• Earlham Family Chiropractic, LLC

  • Clinic/Center
  • Earlham, IA
  • NPI 1407576937
  NPD (past)
• Larchwood Chiropractic, Inc.

  • Chiropractor
  • Larchwood, IA
  • NPI 1063742898
  NPD (past)
• Liautaud Family Chiropractic LLC

  dba Chiropractic Hut

  • Primary Care Clinic/Center
  • Pleasantville, IA
  • NPI 1891176285
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1139443200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782259200000",
    "number": "1023081155",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "225 E 4TH AVE",
            "city": "EUGENE",
            "state": "OR",
            "postal_code": "974012429",
            "telephone_number": "541-762-4807",
            "fax_number": "541-795-8810"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "225 E 4TH AVE",
            "city": "EUGENE",
            "state": "OR",
            "postal_code": "974012429",
            "telephone_number": "541-762-4807"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "114 1/2 E Monroe",
            "address_purpose": "LOCATION",
            "city": "Pleasantville",
            "state": "IA",
            "postal_code": "502257744",
            "country_code": "US",
            "telephone_number": "515-848-3334",
            "fax_number": "515-848-3355",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1018 7th Ave SE",
            "address_purpose": "LOCATION",
            "city": "Olympia",
            "state": "WA",
            "postal_code": "985011512",
            "country_code": "US",
            "telephone_number": "360-459-8114",
            "fax_number": "360-493-8742",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "114 1/2 E Monroe",
            "address_purpose": "LOCATION",
            "city": "Pleasantville",
            "state": "IA",
            "postal_code": "502257744",
            "country_code": "US",
            "telephone_number": "515-848-3334",
            "fax_number": "515-848-3355",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "DEN HARTOG",
        "first_name": "MARK",
        "middle_name": "J",
        "name_prefix": "Dr.",
        "credential": "DC",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2006-02-09",
        "last_updated": "2026-06-24",
        "certification_date": "2026-06-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "111N00000X",
            "taxonomy_group": "",
            "desc": "Chiropractor",
            "state": "OR",
            "license": "6485",
            "primary": true
        },
        {
            "code": "111N00000X",
            "taxonomy_group": "",
            "desc": "Chiropractor",
            "state": "WA",
            "license": "60741817",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Kimberly Demeter, P.S.S.
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• Zelima Ruth Dempsey, QMHA-R
• Daysha Denight, QMHA
• Denna Fulton LCSW LLC
• Summer Denney
• Dennis M Dunne DDS PC (A Childs Best Smile)
• Dennis W Trammell, DMD, MSD, LLC

• Chiropractor in Eugene, OR
• Providers in Eugene, OR by specialty
• Chiropractor in Oregon

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 24, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.