Jonathan Carl Tiemann, DO
Emergency Medicine · Saint Joseph, MI
At a glance
1234 Napier Ave, Saint Joseph, MI 49085-2112
NPPES record updated Apr 8, 2026. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
1234 Napier AveSaint Joseph, MI 49085-2112
Additional reported practice locations
875 S Route 31Crystal Lake, IL 60014
Phone: 7792205500
Fax: 7792205184 1000 Mineral Point Ave
Janesville, WI 535482982
Phone: 6087566868
Fax: 6087566289 8201 E Riverside Blvd
Rockford, IL 611142300
Phone: 8159717000
Fax: 8159684795 1045 W Stephenson St
Freeport, IL 610324864
Phone: 8155996000
Fax: 8155997974
Education & affiliations
- Medical / professional school
- Midwestern University, Chicago College Of Osteopathic Med
- Graduation year
- 2021
- CMS specialties
- Emergency Medicine
Practice groups
Reported hospital affiliations
- Fort Memorial Hospital Fort Atkinson, WI
- Javon Bea Hospital Rockford, IL
- Mercy Health System Corp Janesville, WI
- Mercy Walworth Hospital & Medical Center Lake Geneva, WI
- Mercyhealth Hospital & Physician Clinic-Crystal La Crystal Lake, IL
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
No matching general-payment summary in the imported release. This is not a verified zero and does not rule out other payment types or years.
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Emergency Medicine
- Taxonomy code
- 207P00000X
- Enumeration date
- May 4, 2021
- Record updated
- Apr 8, 2026
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- DO
Reported taxonomies and licenses
207P00000X
License reported: 81595-21 WI
207P00000X
License reported: 036.170401 IL
207P00000X · Primary
License reported: 02007369A IN
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
1234 Napier AveSaint Joseph, MI 49085-2112
- Phone
- (269) 983-8300
Mailing address
23328 BARFIELD DRVALENCIA, CA 913541923
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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