Quick answers
- Which hospitals does Colten Thewis work at?
- Medicare's official clinician data lists Colten Thewis at 1 hospital: Tamarack Health Ashland Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Colten Thewis see patients?
- Medicare's clinician data lists 2 practice locations, including Hayward, WI and Ashland, WI. Call before your visit to confirm the address.
- What is Colten Thewis's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Colten Thewis accept Medicare assignment?
- Medicare's clinician data says Colten Thewis may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is Colten Thewis's NPI number?
- 1457096810. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Colten Thewis works
Medicare's Facility Affiliation Data lists Colten Thewis at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Tamarack Health Ashland Medical CenterAshland, WI · Critical Access Hospital · CCN 521359
Practice locations
Addresses where Colten Thewis is enrolled with Medicare (CMS data updated 2026-10-02).
- 11040 N State Rd, Suite 77Hayward, WI 54843
- 1615 Maple LnAshland, WI 54806
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Hayward
Clinicians with the same Medicare primary specialty in Hayward, WI — not a recommendation.
Clinician information
| Graduation year | 2021 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1457096810 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians