Quick answers
- Which hospitals does Ryan A. Williamson work at?
- Medicare's official clinician data lists Ryan A. Williamson at 4 hospitals: Benefis Hospitals Inc, Billings Clinic Hospital, Johnson City Medical Center and Sagewest Health Care. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ryan A. Williamson see patients?
- Medicare's clinician data lists 3 practice locations, including Billings, MT and Johnson City, TN. Call before your visit to confirm the address.
- What is Ryan A. Williamson's specialty?
- Medicare lists Neurology as the primary specialty.
- Does Ryan A. Williamson accept Medicare assignment?
- Yes. Medicare's clinician data says Ryan A. Williamson 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 Ryan A. Williamson?
- (406) 657-4000, as listed in official Medicare / NPI Registry data.
- What is Ryan A. Williamson's NPI number?
- 1003234204. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ryan A. Williamson works
Medicare's Facility Affiliation Data lists Ryan A. Williamson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Benefis Hospitals IncGreat Falls, MT · Acute Care Hospital · CCN 270012
- Billings Clinic HospitalBillings, MT · Acute Care Hospital · CCN 270004
- Johnson City Medical CenterJohnson City, TN · Acute Care Hospital · CCN 440063
- Sagewest Health CareRiverton, WY · Acute Care Hospital · CCN 530008
Practice locations
Addresses where Ryan A. Williamson is enrolled with Medicare (CMS data updated 2026-10-02).
- 2800 10th Ave NBillings, MT 59101 (406) 657‑4000
- 2800 10th Ave N, Suite DBillings, MT 59101 (406) 238‑2500
- 410 N State of Franklin Rd, Suite 135Johnson City, TN 37604 (423) 431‑2350
Group practices
Medicare enrollment lists Ryan A. Williamson as a member of these groups (CMS data updated 2026-10-02).
- Billings Clinic Specialty Supplies and Services, LLC824 clinicians in the group
- Blue Ridge Medical Management Corporation289 clinicians in the group
Specialties
- Neurologyprimary
Other neurologists in Billings
Clinicians with the same Medicare primary specialty in Billings, MT — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Florida State University College Of Medicine |
| Graduation year | 2014 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1003234204 |
| 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