Robert W Hollenhorst, MD

Primary specialty

Ophthalmology PhysicianTaxonomy code 207W00000X

License

22377 Issued in MN

Practice address

5007 Matterhorn Dr
Duluth, MN 55811-3812

Phone

(218) 720-3553

Fax

(218) 786-9375

NPI assigned

Jun 21, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

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

• Relf Eyecare Specialists PA

  • Ophthalmology Physician
  • Hermantown, MN
  • NPI 1215972617
  NPD (past)

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

{
    "created_epoch": "1150848000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1174569727",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5007 MATTERHORN DR",
            "city": "DULUTH",
            "state": "MN",
            "postal_code": "558113812",
            "telephone_number": "218-720-3553",
            "fax_number": "218-786-9375"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5007 MATTERHORN DR",
            "city": "DULUTH",
            "state": "MN",
            "postal_code": "558113812",
            "telephone_number": "218-720-3553",
            "fax_number": "218-786-9375"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HOLLENHORST",
        "first_name": "ROBERT",
        "middle_name": "W",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-21",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207W00000X",
            "taxonomy_group": "",
            "desc": "Ophthalmology",
            "state": "MN",
            "license": "22377",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "17265100",
            "state": "MN"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Mackenzie Mae Holland, PA-C
• Jennifer Hollander, PTA
• Andrew A Hollatz, M.D.
• Trina J Hollatz, M.D.
• Zachary Herbert Hollen, CCC/AUD
• Annie Holleran, DPT
• Chelsea Renee Hollingswork, OTR
• Lee Hollingsworth
• Clyde H. Holmes, COUNSELOR
• Kailee Holmes, NP

• Ophthalmology Physician in Duluth, MN
• Providers in Duluth, MN by specialty
• Ophthalmology Physician in Minnesota

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.