Mark A Janzen, M.D.

Primary specialty

Diagnostic Radiology PhysicianTaxonomy code 2085R0202X

License

18316 Issued in OK

Practice address

5801 E. 41St Street
Suite 900
Tulsa, OK 74135-5631

Phone

(918) 934-8347

Fax

(918) 743-8552

NPI assigned

Nov 21, 2005

Last updated

Aug 25, 2025By the provider in NPPES

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 4

Medicare fee-for-service enrollment

Enrolled in OK

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Diagnostic Radiology

Education

Other, 1985

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Tulsa X-Ray Laboratory IncGroup PAC ID 4183537426, 29 clinicians

Tulsa X-Ray Laboratory PLLCGroup PAC ID 6103302724, 31 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Hillcrest Hospital Claremore Hospital, Claremore, OK, CCN 370039
• Hillcrest Hospital Pryor Hospital, Pryor, OK, CCN 370015
• Hillcrest Medical Center Hospital, Tulsa, OK, CCN 370001
• Bailey Medical Center, LLC Hospital, Owasso, OK, CCN 370228
• Hillcrest Hospital South Hospital, Tulsa, OK, CCN 370202

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

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.

• Tulsa X-Ray Laboratory PLLC

  dba Tulsa Diagnostic Interventional Radiology

  • Diagnostic Radiology Physician
  • Tulsa, OK
  • NPI 1144211582
  Medicare reassignment Care Compare group NPD
• Radiological Imaging of Oklahoma, L.L.C.

  • Medical Specialty Clinic/Center
  • Owasso, OK
  • NPI 1588649305
  NPD (past)
• Radiology Consultants of Tulsa Inc

  • Diagnostic Radiology Physician
  • Tulsa, OK
  • NPI 1487641890
  NPD (past)
• Tulsa CT LLC

  dba CT of Tulsa

  • Radiology Clinic/Center
  • Tulsa, OK
  • NPI 1598710436
  NPD (past)
• Tulsa Radiology Associates Inc

  • Diagnostic Radiology Physician
  • Tulsa, OK
  • NPI 1871574509
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Ahs Claremore Regional Hospital, LLC.

  dba Hillcrest Hospital Claremore

  • General Acute Care Hospital
  • Claremore, OK
  • NPI 1023398807
  Care Compare affiliation
• Ahs Hillcrest Medical Center, LLC

  dba Hillcrest Medical Center

  • General Acute Care Hospital
  • Tulsa, OK
  • NPI 1629057229
  Care Compare affiliation
• Ahs Pryor Hospital, LLC

  dba Hillcrest Hospital Pryor

  • General Acute Care Hospital
  • Pryor, OK
  • NPI 1780125005
  Care Compare affiliation
• Ahs Southcrest Hospital, LLC

  dba HIllcrest Hospital South

  • General Acute Care Hospital
  • Tulsa, OK
  • NPI 1750661534
  Care Compare affiliation
• Bailey Medical Center, LLC

  • General Acute Care Hospital
  • Owasso, OK
  • NPI 1205846037
  Care Compare affiliation

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

{
    "created_epoch": "1132531200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756080000000",
    "number": "1699758961",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 4930",
            "city": "TULSA",
            "state": "OK",
            "postal_code": "741590930",
            "telephone_number": "918-934-8347",
            "fax_number": "918-743-8552"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5801 E. 41ST STREET",
            "address_2": "SUITE 900",
            "city": "TULSA",
            "state": "OK",
            "postal_code": "741355631",
            "telephone_number": "918-934-8347",
            "fax_number": "918-743-8552"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "JANZEN",
        "first_name": "MARK",
        "middle_name": "A",
        "name_prefix": "Mr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-11-21",
        "last_updated": "2025-08-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "OK",
            "license": "18316",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "100224530A",
            "state": "OK"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MEDICARE",
            "identifier": "243407701",
            "state": "OK"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD MEDICARE",
            "identifier": "300033051",
            "state": "OK"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD MEDICARE",
            "identifier": "300129659",
            "state": "OK"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Elliot Janssen, DO
• Sarah Janssen, DO
• William P Janssens, LCSW
• Keneth Jantzen
• Lyndsay Kathryn Janzen, M.H.R.
• Yenifer Jaquez
• Miguel Angel Jara Palacios, MD
• Amanda Rose Jaramillo
• Janelle Jarchow
• Jared Whitmire Counseling, LLC

• Diagnostic Radiology Physician in Tulsa, OK
• Providers in Tulsa, OK by specialty
• Diagnostic Radiology Physician in Oklahoma

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 25, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• 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.