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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michael John Spak, MD

Radiological Physics Physician in Eau Claire, WI · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1831145721

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Registry record

Entity type Individual (Type 1)
Name Michael John Spak
Credential MD
Sex Male
Practice address 900 West Clairemont Avenue, Eau Claire, WI, 54701
Phone (715) 839-4151
Enumeration date May 25, 2006
Last updated in NPPES Jul 13, 2026

Taxonomy & licenses

2085B0100X Body Imaging Physician Allopathic & Osteopathic Physicians · License 20002 (WI) Secondary
2085B0100X Body Imaging Physician Allopathic & Osteopathic Physicians · License 101042 (MN) Secondary
2085N0700X Neuroradiology Physician Allopathic & Osteopathic Physicians · License 20002 (WI) Secondary
2085N0700X Neuroradiology Physician Allopathic & Osteopathic Physicians · License 101042 (MN) Secondary
2085N0904X Nuclear Radiology Physician Allopathic & Osteopathic Physicians · License 20002 (WI) Secondary
2085N0904X Nuclear Radiology Physician Allopathic & Osteopathic Physicians · License 101042 (MN) Secondary
2085P0229X Pediatric Radiology Physician Allopathic & Osteopathic Physicians · License 20002 (WI) Secondary
2085P0229X Pediatric Radiology Physician Allopathic & Osteopathic Physicians · License 101042 (MN) Secondary
2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 20002 (WI) Secondary
2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 101042 (MN) Secondary
2085R0204X Vascular & Interventional Radiology Physician Allopathic & Osteopathic Physicians · License 20002 (WI) Secondary
2085R0204X Vascular & Interventional Radiology Physician Allopathic & Osteopathic Physicians · License 101042 (MN) Secondary
2085R0205X Radiological Physics Physician Allopathic & Osteopathic Physicians · License 20002 (WI) Primary
2085U0001X Diagnostic Ultrasound Physician Allopathic & Osteopathic Physicians · License 20002 (WI) Secondary
2085U0001X Diagnostic Ultrasound Physician Allopathic & Osteopathic Physicians · License 101042 (MN) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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.

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Frequently asked questions

Is NPI 1831145721 active?
Yes, as of the latest NPPES snapshot, NPI 1831145721 is active (record last updated 2026-07-13).
How do I verify Michael Spak's NPI record?
Cross-check NPI 1831145721 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-13.