Quick answers
- Which hospitals does Mark T. De Boer work at?
- Medicare's official clinician data lists Mark T. De Boer at 4 hospitals: Billings Clinic Hospital, Bozeman Health Deaconess Hospital, Livingston Healthcare and Ruby Valley Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark T. De Boer see patients?
- Medicare's clinician data lists 5 practice locations, including Livingston, MT, Cody, WY and Bozeman, MT. Call before your visit to confirm the address.
- What is Mark T. De Boer's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does Mark T. De Boer accept Medicare assignment?
- Yes. Medicare's clinician data says Mark T. De Boer accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mark T. De Boer?
- (406) 222-0030, as listed in official Medicare / NPI Registry data.
- What is Mark T. De Boer's NPI number?
- 1548331440. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark T. De Boer works
Medicare's Facility Affiliation Data lists Mark T. De Boer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Billings Clinic HospitalBillings, MT · Acute Care Hospital · CCN 270004
- Bozeman Health Deaconess HospitalBozeman, MT · Acute Care Hospital · CCN 270057
- Livingston HealthcareLivingston, MT · Critical Access Hospital · CCN 271317
- Ruby Valley Medical CenterSheridan, MT · Critical Access Hospital · CCN 271319
Practice locations
Addresses where Mark T. De Boer is enrolled with Medicare (CMS data updated 2026-10-02).
- 104 Centennial DrLivingston, MT 59047 (406) 222‑0030
- 104 Centennial Dr, Suite 103Livingston, MT 59047 (406) 222‑0030
- 201 Yellowstone AveCody, WY 82414 (307) 527‑7561
- 320 Alpenglow LnLivingston, MT 59047 (406) 222‑3541
- 3905 Wellness WayBozeman, MT 59718 (406) 898‑1200
Group practices
Medicare enrollment lists Mark T. De Boer as a member of these groups (CMS data updated 2026-10-02).
- Billings Clinic Specialty Supplies and Services, LLC824 clinicians in the group
- Livingston Healthcare67 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Montana →
Other cardiologists in Montana
Clinicians with the same Medicare primary specialty in Montana — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1985 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1548331440 |
| 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