Nathaniel Timothy Jest, D.O.

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

71167-21 Issued in WI

Practice address

2801 W Kinnickinnic River Pkwy Ste 1080
Milwaukee, WI 53215-3689

Phone

(414) 908-6506

Fax

(414) 908-6510

NPI assigned

May 25, 2012

Sex

Male

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in WI

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

GastroenterologyAlso: Internal Medicine

Education

Other, 2012

Medicare assignment

May accept Medicare assignment

Group practices

Gastroenterology Specialists SCGroup PAC ID 3375626195, 29 clinicians

Milwaukee Gi Specialists SCGroup PAC ID 8123930542, 15 clinicians

Gi Associates LLCGroup PAC ID 6103738562, 55 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Ascension SE Wisconsin Hospital Hospital, Milwaukee, WI, CCN 520136
• Oconomowoc Memorial Hospital Hospital, Oconomowoc, WI, CCN 520062
• Waukesha Memorial Hospital Hospital, Waukesha, WI, CCN 520008

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: njest119665@direct.phci.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.

• Gastroenterology Specialists SC

  • Gastroenterology Physician
  • Waukesha, WI
  • NPI 1558443549
  Medicare reassignment Care Compare group NPD
• Gi Associates LLC

  • Gastroenterology Physician
  • Milwaukee, WI
  • NPI 1801863501
  Medicare reassignment Care Compare group NPD
• Milwaukee Gi Specialists SC

  • Gastroenterology Physician
  • Wauwatosa, WI
  • NPI 1639515000
  Medicare reassignment Care Compare group NPD
• Wisconsin Health Fund

  • Multi-Specialty Clinic/Center
  • Milwaukee, WI
  • NPI 1497768659
  Medicare reassignment NPD

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

• Ascension SE Wisconsin Hospital, Inc

  • General Acute Care Hospital
  • Milwaukee, WI
  • NPI 1427007384
  Care Compare affiliation
• Ascension SE Wisconsin Hospital, Inc

  • Rehabilitation Hospital Unit
  • Brookfield, WI
  • NPI 1861417362
  Care Compare affiliation
• Prohealth Oconomowoc Memorial Hospital, Inc.

  • General Acute Care Hospital
  • Oconomowoc, WI
  • NPI 1366420531
  Care Compare affiliation
• Prohealth Oconomowoc Memorial Hospital, Inc.

  • Community/Retail Pharmacy
  • Oconomowoc, WI
  • NPI 1497942205

  Hospital

  Care Compare affiliation
• Prohealth Waukesha Memorial Hospital, Inc.

  • General Acute Care Hospital
  • Waukesha, WI
  • NPI 1629056890
  Care Compare affiliation

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

{
    "created_epoch": "1337904000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1769385600000",
    "number": "1053671982",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2801 W KINNICKINNIC RIVER PKWY STE 1080",
            "city": "MILWAUKEE",
            "state": "WI",
            "postal_code": "532153689",
            "telephone_number": "414-908-6506",
            "fax_number": "414-908-6510"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2801 W KINNICKINNIC RIVER PKWY STE 1080",
            "city": "MILWAUKEE",
            "state": "WI",
            "postal_code": "532153689",
            "telephone_number": "414-908-6506",
            "fax_number": "414-908-6510"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "JEST",
        "first_name": "NATHANIEL",
        "middle_name": "TIMOTHY",
        "credential": "D.O.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2012-05-25",
        "last_updated": "2026-01-26",
        "certification_date": "2026-01-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "WI",
            "license": "71167-21",
            "primary": true
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "FL",
            "license": "UO3052",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "WI",
            "license": "71167-21",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jerry D Gragg DDS
• Blake Louis Jeska, PA-C
• Shannon Lynn Jeske, M.S., SAC-IT, PC-IT
• Grace Louise Jessen, LCSW
• Jessica L. Hoelzle
• Erica Jeter, LPN
• Tracey Mechelle Jeter, RN
• Dipti R Jethani, PMHNP
• Trisha Eeshanee Jethwa, MD
• Jennifer Garcia Jetton, M.D.

• Gastroenterology Physician in Milwaukee, WI
• Providers in Milwaukee, WI by specialty
• Gastroenterology Physician in Wisconsin

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 26, 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.