Ronald J Janzen, MD

Primary specialty

SpecialistTaxonomy code 174400000X

License

10445 Issued in OK

Practice address

4200 W Memorial Rd
Suite 212
Oklahoma City, OK 73120-9350

Phone

(405) 755-2087

Fax

(405) 755-2959

NPI assigned

Jun 4, 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

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Medicine

State licenses

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

{
    "created_epoch": "1149379200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1982643383",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "4200 W MEMORIAL RD",
            "address_2": "SUITE 212",
            "city": "OKLAHOMA CITY",
            "state": "OK",
            "postal_code": "731209350",
            "telephone_number": "405-755-2087",
            "fax_number": "405-755-2959"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4200 W MEMORIAL RD",
            "address_2": "SUITE 212",
            "city": "OKLAHOMA CITY",
            "state": "OK",
            "postal_code": "731209350",
            "telephone_number": "405-755-2087",
            "fax_number": "405-755-2959"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "JANZEN",
        "first_name": "RONALD",
        "middle_name": "J",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-04",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "174400000X",
            "taxonomy_group": "",
            "desc": "Specialist",
            "state": "OK",
            "license": "10445",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Amber January
• Brandon January, DC
• Megan January, DC
• Brianna Nicole Janway
• Matthew I Janzen, D.C.
• Jape Behavioral Health Services, P.L.L.C.
• Iris Jaquez, RD, LD
• Ytzel Ailsa Jara Gonzalez
• Brittany Jaramillo, M.A.
• Matthew Jared, M.D.

• Specialist in Oklahoma City, OK
• Providers in Oklahoma City, OK by specialty
• Specialist in Oklahoma

• 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.