Quick answers
- Which hospitals does Sean M. Tierney work at?
- Medicare's official clinician data lists Sean M. Tierney at 1 hospital: Mad River Community Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sean M. Tierney see patients?
- Medicare's clinician data lists 1 practice location in Arcata, CA. Call before your visit to confirm the address.
- What is Sean M. Tierney's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Sean M. Tierney accept Medicare assignment?
- Yes. Medicare's clinician data says Sean M. Tierney 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 Sean M. Tierney's NPI number?
- 1578593232. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sean M. Tierney works
Medicare's Facility Affiliation Data lists Sean M. Tierney at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mad River Community HospitalArcata, CA · Acute Care Hospital · CCN 050028
Practice locations
Addresses where Sean M. Tierney is enrolled with Medicare (CMS data updated 2026-10-02).
- 3800 Janes RdArcata, CA 95521
Group practices
Medicare enrollment lists Sean M. Tierney as a member of this group (CMS data updated 2026-10-02).
- North Pacific Cardiology Medical22 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Arcata
Clinicians with the same Medicare primary specialty in Arcata, CA — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | New York College Of Osteo Medicine Of New York Institute Of Technology |
| Graduation year | 1998 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578593232 |
| 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