Jonathan Carl Tiemann, DO
NPI 1437732708ActiveIndividual· Emergency Medicine· Saint Joseph, MI
Emergency Medicine (DO) in Saint Joseph, Michigan, trained at Midwestern University, Chicago College of Osteopathic Med (class of 2021). 101 Medicare patients in 2024, $11,865 paid; nearly all of their 360 Part D prescriptions were generic (95%).
Overview
| NPI | 1437732708 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | May 4, 2021 |
| Last updated in NPPES | Apr 8, 2026 |
| Certified by provider | Apr 8, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Emergency Medicine Primary | 207P00000X | 02007369A | IN |
| Emergency Medicine | 207P00000X | 81595-21 | WI |
| Emergency Medicine | 207P00000X | 036.170401 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Emergency Medicine (IL); Practitioner - Emergency Medicine (IN); Practitioner - Emergency Medicine (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 101 |
|---|---|
| Services billed | 115 across 18 procedure codes |
| Paid by Medicare | $11,865 |
Part D prescriptions in 2024
| Prescriptions (claims) | 360 · 550 30-day fills |
|---|---|
| Patients | 180 |
| Total drug cost | $11,755 |
| Generic share | 95% of claims |
Education and affiliations
| Medical school | Midwestern University, Chicago College of Osteopathic Med |
|---|---|
| Graduation year | 2021 |
| Medicare specialty | Emergency Medicine |
Medical groups
- Mercy Health System CorporationJanesville, WI · 753 clinicians
- Rockford Health PhysiciansRockford, IL · 521 clinicians
- Freeport Memorial HospitalFreeport, IL · 178 clinicians
- Swea Fort SCFort Atkinson, WI · 52 clinicians
Hospital affiliations
- Fort Memorial HospitalFort Atkinson, WI
- Javon Bea HospitalRockford, IL
- Mercy Health System CorpJanesville, WI
- Mercy Walworth Hospital & Medical CenterLake Geneva, WI
- Mercyhealth Hospital & Physician Clinic-Crystal laCrystal Lake, IL
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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