Quick answers
- Which hospitals does Thomas Callahan work at?
- Medicare's official clinician data lists Thomas Callahan at 3 hospitals: Nor-Lea Hospital District, Sierra Nevada Memorial Hospital and University of California Davis Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Thomas Callahan see patients?
- Medicare's clinician data lists 10 practice locations, including Lovington, NM, Folsom, CA and Sacramento, CA. Call before your visit to confirm the address.
- What is Thomas Callahan's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Thomas Callahan accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas Callahan 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 Thomas Callahan?
- (916) 351-4800, as listed in official Medicare / NPI Registry data.
- What is Thomas Callahan's NPI number?
- 1508809138. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Thomas Callahan works
Medicare's Facility Affiliation Data lists Thomas Callahan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Nor-Lea Hospital DistrictLovington, NM · Critical Access Hospital · CCN 321305
- Sierra Nevada Memorial HospitalGrass Valley, CA · Acute Care Hospital · CCN 050150
- University of California Davis Medical CenterSacramento, CA · Acute Care Hospital · CCN 050599
Practice locations
Addresses where Thomas Callahan is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 10; the Medicare profile lists all.
- 1600 N MainLovington, NM 88260
- 1600 N Main AveLovington, NM 88260
- 1700 Prairie City RdFolsom, CA 95630 (916) 351‑4800
- 1730 Prairie City Rd, Suite 120Folsom, CA 95630 (916) 351‑4800
- 2315 Stockton BlvdSacramento, CA 95817
Group practices
Medicare enrollment lists Thomas Callahan as a member of these groups (CMS data updated 2026-10-02).
- Regents of the Univ of Ca1,584 clinicians in the group
- Dignity Health Medical Foundation1,184 clinicians in the group
- Radiology Associates of North Texas PA346 clinicians in the group
- Nor-Lea Hospital District57 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in New Mexico
Clinicians with the same Medicare primary specialty in New Mexico — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Vermont College Of Medicine |
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1508809138 |
| 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