Michael John Spak, MD
Michael John Spak is a Radiological Physics Physician provider (Radiology) practicing in Eau Claire, WI, registered in the NPPES registry with NPI 1831145721 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1831145721 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Michael John Spak |
| Credential | MD |
| Sex | Male |
| Practice address | 900 WEST CLAIREMONT AVENUE, Eau Claire, WI, 54701 |
| Phone | 7158394151 |
| Enumeration date | 2006-05-25 |
| Last updated in NPPES | 2025-09-11 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 2085B0100X | Body Imaging Physician | Secondary | 20002 | WI |
| 2085B0100X | Body Imaging Physician | Secondary | 101042 | MN |
| 2085N0700X | Neuroradiology Physician | Secondary | 20002 | WI |
| 2085N0700X | Neuroradiology Physician | Secondary | 101042 | MN |
| 2085N0904X | Nuclear Radiology Physician | Secondary | 20002 | WI |
| 2085N0904X | Nuclear Radiology Physician | Secondary | 101042 | MN |
| 2085P0229X | Pediatric Radiology Physician | Secondary | 20002 | WI |
| 2085P0229X | Pediatric Radiology Physician | Secondary | 101042 | MN |
| 2085R0202X | Diagnostic Radiology Physician | Secondary | 20002 | WI |
| 2085R0202X | Diagnostic Radiology Physician | Secondary | 101042 | MN |
| 2085R0204X | Vascular & Interventional Radiology Physician | Secondary | 20002 | WI |
| 2085R0204X | Vascular & Interventional Radiology Physician | Secondary | 101042 | MN |
| 2085R0205X | Radiological Physics Physician | Primary | 20002 | WI |
| 2085U0001X | Diagnostic Ultrasound Physician | Secondary | 20002 | WI |
| 2085U0001X | Diagnostic Ultrasound Physician | Secondary | 101042 | MN |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Copy-ready billing details
Provider: Michael Spak, MD NPI: 1831145721 Taxonomy: 2085R0205X (Radiological Physics Physician) Address: 900 WEST CLAIREMONT AVENUE, Eau Claire, WI, 54701
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1134173156 | Greg Heiler | Individual | Blood Banking & Transfusion Medicine Physician | Eau Claire, WI |
| 1487600367 | Benjamin Whitis | Individual | Neuroradiology Physician | Eau Claire, WI |
| 1295781185 | John Feldmeier | Individual | Diagnostic Radiology Physician | Eau Claire, WI |
| 1104872092 | Karl Stien | Individual | Diagnostic Radiology Physician | Eau Claire, WI |
| 1013963909 | Mark Augustyn | Individual | Diagnostic Radiology Physician | Eau Claire, WI |
| 1740236637 | Merle Edwards | Individual | Diagnostic Radiology Physician | Eau Claire, WI |
| 1659327542 | James Geraghty | Individual | Diagnostic Radiology Physician | Eau Claire, WI |
Verify this record
Cross-check NPI 1831145721 against the authoritative CMS record: view Michael John Spak on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2025-09-11.