Mark Loren Keldahl, MD

Primary specialty

Vascular Surgery PhysicianTaxonomy code 2086S0129X

License

036-117220 Issued in IL

Practice address

3000 N. Halsted St.
Suite 703
Chicago, IL 60657

Phone

(773) 296-3390

Fax

(773) 296-7531

NPI assigned

Jul 14, 2008

Sex

Male

Sole proprietor

No

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

Specialties & licenses 4

Addresses

Electronic endpoints 3

Medicare fee-for-service enrollment

Enrolled in IL, TN2 enrollments

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 2

Specialty

Vascular Surgery

Education

Rush Medical College of Rush University, 2004

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Advocate Health and Hospitals CorporationGroup PAC ID 7810800935, 3,081 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Advocate Home Health Care Serv Home health agency, Oakbrook, IL, CCN 147150
• Advocate Illinois Masonic Medical Center Hospital, Chicago, IL, CCN 140182
• Advocate Good Samaritan Hospital Hospital, Downers Grove, IL, CCN 140288
• Advocate Lutheran General Hospital Hospital, Park Ridge, IL, CCN 140223
• Advocate Trinity Hospital Hospital, Chicago, IL, CCN 140048

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mkeldahl205985@direct.myadvocateaurora.org

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.

• Advocate Health and Hospitals Corporation

  • Multi-Specialty Clinic/Center
  • Oak Brook, IL
  • NPI 1700824455
  Medicare reassignment Care Compare group NPD
• Advocate Health and Hospitals Corporation

  • Children's Hospital
  • Oak Lawn, IL
  • NPI 1508315516
  NPD
• Advocate North Side Health Network

  • Clinic/Center
  • Chicago, IL
  • NPI 1780788323
  NPD (past)

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

• Advocate Health and Hospitals Corporation

  • General Acute Care Hospital
  • Park Ridge, IL
  • NPI 1164539730
  Care Compare affiliation
• Advocate Health and Hospitals Corporation

  • General Acute Care Hospital
  • Hazel Crest, IL
  • NPI 1467560128
  Care Compare affiliation
• Advocate Health and Hospitals Corporation

  • General Acute Care Hospital
  • Chicago, IL
  • NPI 1558479212
  Care Compare affiliation
• Advocate Health and Hospitals Corporation

  • General Acute Care Hospital
  • Downers Grove, IL
  • NPI 1578670543
  Care Compare affiliation
• Advocate North Side Health Network

  • General Acute Care Hospital
  • Chicago, IL
  • NPI 1912014564
  Care Compare affiliation
• Ehs Home Health Care Service Inc

  • Home Health Agency
  • Oak Brook, IL
  • NPI 1598732075
  Care Compare affiliation

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

{
    "created_epoch": "1215993600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782345600000",
    "number": "1114181658",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "29373 NETWORK PL",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606731293",
            "telephone_number": "847-390-5900"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3000 N. HALSTED ST.",
            "address_2": "SUITE 703",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "60657",
            "telephone_number": "773-296-3390",
            "fax_number": "773-296-7531"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1325 Eastmoreland Ave Ste 365",
            "address_purpose": "LOCATION",
            "city": "Memphis",
            "state": "TN",
            "postal_code": "381047542",
            "country_code": "US",
            "telephone_number": "901-272-6018",
            "fax_number": "901-201-4203",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "KELDAHL",
        "first_name": "MARK",
        "middle_name": "LOREN",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2008-07-14",
        "last_updated": "2026-06-25",
        "certification_date": "2026-06-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2086S0129X",
            "taxonomy_group": "",
            "desc": "Surgery, Vascular Surgery",
            "state": "TN",
            "license": "59517",
            "primary": false
        },
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "IL",
            "license": "036-117220",
            "primary": false
        },
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "IL",
            "license": "036117220",
            "primary": false
        },
        {
            "code": "2086S0129X",
            "taxonomy_group": "",
            "desc": "Surgery, Vascular Surgery",
            "state": "IL",
            "license": "036-117220",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "CONNECT",
            "endpointTypeDescription": "CONNECT URL",
            "endpoint": "https://esmd.abilitynetwork.com:8291/Gateway/DocumentSubmission/2_0/NhinService/XDRRequest_Service",
            "affiliation": "Y",
            "endpointDescription": "2.16.840.1.113883.3.667.2",
            "affiliationName": "ABILITY Network",
            "use": "OTHER",
            "useDescription": "Other",
            "useOtherDescription": "CMS esMD eMDR",
            "contentType": "CSV",
            "contentTypeDescription": "CSV",
            "address_1": "64 S Price Rd Ste B",
            "city": "Brownsville",
            "state": "TX",
            "country_code": "US",
            "postal_code": "785212459",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "mkeldahl205985@direct.myadvocateaurora.org",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "3000 N Halsted St Ste 509",
            "city": "Chicago",
            "state": "IL",
            "country_code": "US",
            "postal_code": "606575194",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://EpicFHIR.aurora.org/FHIR/MYAURORA/api/FHIR/DSTU2/",
            "affiliation": "N",
            "address_1": "3000 N Halsted St Ste 509",
            "city": "Chicago",
            "state": "IL",
            "country_code": "US",
            "postal_code": "606575194",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• William Keith
• Laura Kek
• Joseph Kofi Selase Kekrebesi, MD, MPH
• Linda Caroline Kelahan, MD
• Heather A Keldahl, CRNA
• Madison Keleher, LCSW
• Shannon Keleher
• Anita Hiren Kelekar, M.D.
• Armen Kelikian, MD
• Kelin Hall, LCSW, PLLC

• Vascular Surgery Physician in Chicago, IL
• Providers in Chicago, IL by specialty
• Vascular Surgery Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 25, 2026; 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.