Quick answers
- Which hospitals does Calvin J. Tan work at?
- Medicare's official clinician data lists Calvin J. Tan at 2 hospitals: Benefis Hospitals Inc and Kaiser Foundation Hospital - San Diego. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Calvin J. Tan see patients?
- Medicare's clinician data lists 2 practice locations, including Great Falls, MT and San Diego, CA. Call before your visit to confirm the address.
- What is Calvin J. Tan's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Calvin J. Tan accept Medicare assignment?
- Yes. Medicare's clinician data says Calvin J. Tan 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 Calvin J. Tan?
- (406) 455-5000, as listed in official Medicare / NPI Registry data.
- What is Calvin J. Tan's NPI number?
- 1073176020. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Calvin J. Tan works
Medicare's Facility Affiliation Data lists Calvin J. Tan 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
- Kaiser Foundation Hospital - San DiegoSan Diego, CA · Acute Care Hospital · CCN 050515
Practice locations
Addresses where Calvin J. Tan is enrolled with Medicare (CMS data updated 2026-10-02).
- 1101 26th St SGreat Falls, MT 59405 (406) 455‑5000
- 4647 Zion AveSan Diego, CA 92120 (619) 528‑5000
Group practices
Medicare enrollment lists Calvin J. Tan as a member of these groups (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
- Benefis Hospitals Inc384 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 | MD |
|---|---|
| Graduation year | 2023 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1073176020 |
| 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