Jonathan Carl Tiemann, DO

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

02007369A Issued in IN

Practice address

1234 Napier Ave
Saint Joseph, MI 49085-2112

Phone

(269) 983-8300

NPI assigned

May 4, 2021

Last updated

Apr 8, 2026By 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 3

Addresses

Medicare fee-for-service enrollment

Enrolled in IN, IL, WI3 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 3

Specialty

Emergency Medicine

Education

Midwestern University, Chicago College of Osteopathic Med, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Mercy Health System CorporationGroup PAC ID 7416860440, shared by 14 NPIs, 749 clinicians

Freeport Memorial HospitalGroup PAC ID 8426958232, 168 clinicians

Swea Fort SCGroup PAC ID 0345774972, 51 clinicians

Rockford Health PhysiciansGroup PAC ID 2567374036, 520 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Javon Bea Hospital Hospital, Rockford, IL, CCN 140239
• Mercy Walworth Hospital & Medical Center Hospital, Lake Geneva, WI, CCN 521357
• Mercyhealth Hospital & Physician Clinic-Crystal la Hospital, Crystal Lake, IL, CCN 140308
• Fort Memorial Hospital Hospital, Fort Atkinson, WI, CCN 520071
• Mercy Health System Corp Hospital, Janesville, WI, CCN 520066

Merit-based Incentive Payment System (MIPS)

Final score

96.14 of 100Reported as apm

Quality

88.29

Promoting interoperability

98.25

Improvement activities

40

Merit-based Incentive Payment System (MIPS)

Final score

96.14 of 100Reported as apm

Quality

88.29

Promoting interoperability

98.25

Improvement activities

40

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: jtiemann117196@direct.mhemail.org

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.

• Rockford Health Physicians

  dba Mercyhealth Physicians

  • Multi-Specialty Clinic/Center
  • Rockford, IL
  • NPI 1043242886
  Medicare reassignment Care Compare group NPD
• Swea Fort SC

  • Emergency Medicine Physician
  • Fort Atkinson, WI
  • NPI 1295552065
  Medicare reassignment Care Compare group NPD
• Freeport Memorial Hospital

  dba FHN-Memorial Hospital

  • General Acute Care Hospital
  • Freeport, IL
  • NPI 1447228788
  Medicare reassignment Care Compare group
• Clarksville Emergency Group, PC

  • Emergency Medicine Physician
  • Corydon, IN
  • NPI 1023487154
  Medicare reassignment NPD
• Mercy Harvard Hospital Inc

  • Critical Access Hospital
  • Harvard, IL
  • NPI 1427001445
  Medicare reassignment NPD
• Mercy Health System Corporation

  dba MHS Physician Services

  • Multi-Specialty Clinic/Center
  • Janesville, WI
  • NPI 1598718603

  IL

  Medicare reassignment NPD
• Mercy Health System Corporation

  dba Mercy Walworth Hospital and Medical Center

  • Critical Access Hospital
  • Lake Geneva, WI
  • NPI 1699728550
  Medicare reassignment NPD
• Freeport Regional Health Care Foundation

  dba FHN

  • Family Medicine Physician
  • Freeport, IL
  • NPI 1457337016
  Medicare reassignment
• Mercy Harvard Hospital Inc

  dba Mercy Harvard Care Center

  • Skilled Nursing Facility
  • Harvard, IL
  • NPI 1124195557
  NPD
• Mercy Health System Corporation

  dba Mercy Hospital Janesville

  • General Acute Care Hospital
  • Janesville, WI
  • NPI 1093768962
  NPD

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

• Fort Healthcare Inc

  • Otolaryngology Physician
  • Fort Atkinson, WI
  • NPI 1417993361

  Hospital

  Care Compare affiliation
• Fort Healthcare, Inc.

  • General Acute Care Hospital
  • Fort Atkinson, WI
  • NPI 1811916281
  Care Compare affiliation
• Javon Bea Hospital

  • General Acute Care Hospital
  • Rockford, IL
  • NPI 1629118609
  Care Compare affiliation
• Mercy Crystal Lake Hospital and Medical Center Inc

  dba Mercyhealth Hospital and Physician Clinic-Crystal Lake

  • General Acute Care Hospital
  • Crystal Lake, IL
  • NPI 1023754371
  Care Compare affiliation
• Mercy Health System Corporation

  dba Mercy Hospital Janesville

  • General Acute Care Hospital
  • Janesville, WI
  • NPI 1093768962
  Care Compare affiliation
• Mercy Health System Corporation

  dba Mercy Walworth Hospital and Medical Center

  • Critical Access Hospital
  • Lake Geneva, WI
  • NPI 1699728550
  Care Compare affiliation

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

{
    "created_epoch": "1620086400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1775606400000",
    "number": "1437732708",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "23328 BARFIELD DR",
            "city": "VALENCIA",
            "state": "CA",
            "postal_code": "913541923"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1234 NAPIER AVE",
            "city": "SAINT JOSEPH",
            "state": "MI",
            "postal_code": "490852112",
            "telephone_number": "269-983-8300"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "875 S Route 31",
            "address_purpose": "LOCATION",
            "city": "Crystal Lake",
            "state": "IL",
            "postal_code": "60014",
            "country_code": "US",
            "telephone_number": "779-220-5500",
            "fax_number": "779-220-5184",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1000 Mineral Point Ave",
            "address_purpose": "LOCATION",
            "city": "Janesville",
            "state": "WI",
            "postal_code": "535482982",
            "country_code": "US",
            "telephone_number": "608-756-6868",
            "fax_number": "608-756-6289",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "8201 E Riverside Blvd",
            "address_purpose": "LOCATION",
            "city": "Rockford",
            "state": "IL",
            "postal_code": "611142300",
            "country_code": "US",
            "telephone_number": "815-971-7000",
            "fax_number": "815-968-4795",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1045 W Stephenson St",
            "address_purpose": "LOCATION",
            "city": "Freeport",
            "state": "IL",
            "postal_code": "610324864",
            "country_code": "US",
            "telephone_number": "815-599-6000",
            "fax_number": "815-599-7974",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "TIEMANN",
        "first_name": "JONATHAN",
        "middle_name": "CARL",
        "name_prefix": "Dr.",
        "credential": "DO",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2021-05-04",
        "last_updated": "2026-04-08",
        "certification_date": "2026-04-08",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "WI",
            "license": "81595-21",
            "primary": false
        },
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "IL",
            "license": "036.170401",
            "primary": false
        },
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "IN",
            "license": "02007369A",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Robert C. Thomas Jr., MD
• Ellen J. Thomasma, LMSW, ACSW
• Dennis Fred Thompson, MD
• Josiah James Thompson, DPT
• Parker Stephen Thorson
• Timothy Ward PLC
• Rex L Tinch, OTR
• Daniel Kent Tinkey, ATC
• Carly Tittle
• Duane Allen Tolsma, O.D.

• Emergency Medicine Physician in Saint Joseph, MI
• Providers in Saint Joseph, MI by specialty
• Emergency Medicine Physician in Michigan

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 8, 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.