Quick answers
- Which hospitals does John Ellis work at?
- Medicare's official clinician data lists John Ellis at 3 hospitals: Alta Bates Summit Medical Center, Alta Bates Summit Medical Center - Alta Bates Camp… and Benefis Hospitals Inc. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John Ellis see patients?
- Medicare's clinician data lists 3 practice locations, including Great Falls, MT, Berkeley, CA and Oakland, CA. Call before your visit to confirm the address.
- What is John Ellis's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does John Ellis accept Medicare assignment?
- Yes. Medicare's clinician data says John Ellis 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 John Ellis?
- (406) 455-5000, as listed in official Medicare / NPI Registry data.
- What is John Ellis's NPI number?
- 1003221037. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John Ellis works
Medicare's Facility Affiliation Data lists John Ellis at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Alta Bates Summit Medical CenterOakland, CA · Acute Care Hospital · CCN 050043
- Alta Bates Summit Medical Center - Alta Bates Camp…Berkeley, CA · Acute Care Hospital · CCN 050305
- Benefis Hospitals IncGreat Falls, MT · Acute Care Hospital · CCN 270012
Practice locations
Addresses where John Ellis is enrolled with Medicare (CMS data updated 2026-10-02).
- 1101 26th St SGreat Falls, MT 59405 (406) 455‑5000
- 2450 Ashby AveBerkeley, CA 94705 (510) 204‑4444
- 350 Hawthorne AveOakland, CA 94609 (510) 655‑4000
Group practices
Medicare enrollment lists John Ellis as a member of these groups (CMS data updated 2026-10-02).
- Benefis Hospitals Inc384 clinicians in the group
- Berkeley Emergency Medical Group Inc41 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Great Falls
Clinicians with the same Medicare primary specialty in Great Falls, MT — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Lake Erie College Of Osteopathic Medicine, Bradenton |
| Graduation year | 2014 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1003221037 |
| 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