Hospitalist
Dr. JOHN THIESZEN M.D.
Identity confirmed via CMS NPPES · September 30, 2026 · A directory match is not a coverage approval.
Is this your practice? This listing was imported from public provider identity data (CMS NPPES) and has not yet been claimed. Claim this listing to confirm the practice details. Plan acceptance stays unpublished until the practice reports it.
Public record
NPI 1285667816 · enumerated 2006-07-08 · record updated 2010-12-06. Source: CMS NPPES. A listing is not a TRICARE network approval.
NPPES recordGoogle Maps Apple Maps OpenStreetMap
Addresses and phones
- Mailing address 1281 E MAGNOLIA ST, SUITE D199, FORT COLLINS, CO, 80524-4796 (970) 391-0572 Fax (815) 377-2580 Google Maps Apple Maps OpenStreetMap
- Practice location 3528 GABEL RD, BILLINGS, MT, 59102-7307 (970) 391-0572 Fax (815) 377-2580 Google Maps Apple Maps OpenStreetMap
Specialties
- Internal Medicine 207R00000X · License 47877-020 WI
- Internal Medicine 207R00000X · License 47210 CO
- Hospitalist 208M00000X · Primary · License 47210 CO
In this directory
Locations and evidence
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Practice location
BILLINGS, MT, 591027307
Accepting new patientsNot reportedCMS NPPES · September 30, 2026
Plan acceptance
- No published plan acceptance yet. Confirm directly with the practice, or claim this listing if it's yours.