Quick answers
- Which hospitals does Brian Sullivan work at?
- Medicare's official clinician data lists Brian Sullivan at 4 hospitals: Beartooth Billings Clinic, Billings Clinic Hospital, Intermountain Health St Vincent Regional Hospital and Stillwater Billings Clinic. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Brian Sullivan see patients?
- Medicare's clinician data lists 6 practice locations, including Billings, MT and Columbus, MT. Call before your visit to confirm the address.
- What is Brian Sullivan's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Brian Sullivan accept Medicare assignment?
- Yes. Medicare's clinician data says Brian Sullivan 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 Brian Sullivan?
- (406) 238-5254, as listed in official Medicare / NPI Registry data.
- What is Brian Sullivan's NPI number?
- 1154400562. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Brian Sullivan works
Medicare's Facility Affiliation Data lists Brian Sullivan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Beartooth Billings ClinicRed Lodge, MT · Critical Access Hospital · CCN 271326
- Billings Clinic HospitalBillings, MT · Acute Care Hospital · CCN 270004
- Intermountain Health St Vincent Regional HospitalBillings, MT · Acute Care Hospital · CCN 270049
- Stillwater Billings ClinicColumbus, MT · Critical Access Hospital · CCN 271330
Practice locations
Addresses where Brian Sullivan is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 2702 8th Ave NBillings, MT 59101 (406) 238‑5254
- 2800 10th Ave NBillings, MT 59101 (406) 657‑4000
- 2800 10th Ave N, Suite DBillings, MT 59101 (406) 238‑2500
- 2929 10th Ave NBillings, MT 59101 (406) 657‑4000
- 710 11th St NColumbus, MT 59019 (406) 322‑6150
Group practices
Medicare enrollment lists Brian Sullivan as a member of this group (CMS data updated 2026-10-02).
- Billings Clinic Specialty Supplies and Services, LLC824 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Billings
Clinicians with the same Medicare primary specialty in Billings, MT — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154400562 |
| 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