Quick answers
- Which hospitals does David J. Horwitz work at?
- Medicare's official clinician data lists David J. Horwitz at 2 hospitals: Mad River Community Hospital and Providence St Joseph Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does David J. Horwitz see patients?
- Medicare's clinician data lists 3 practice locations, including Arcata, CA and Eureka, CA. Call before your visit to confirm the address.
- What is David J. Horwitz's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does David J. Horwitz accept Medicare assignment?
- Yes. Medicare's clinician data says David J. Horwitz 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 David J. Horwitz?
- (707) 826-8610, as listed in official Medicare / NPI Registry data.
- What is David J. Horwitz's NPI number?
- 1386739845. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where David J. Horwitz works
Medicare's Facility Affiliation Data lists David J. Horwitz 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
- Providence St Joseph HospitalEureka, CA · Acute Care Hospital · CCN 050006
Practice locations
Addresses where David J. Horwitz is enrolled with Medicare (CMS data updated 2026-10-02).
- 1150 Foster AveArcata, CA 95521 (707) 826‑8610
- 2200 Tydd StEureka, CA 95501 (707) 441‑1624
- 770 10th StArcata, CA 95521 (707) 826‑8610
Group practices
Medicare enrollment lists David J. Horwitz as a member of this group (CMS data updated 2026-10-02).
- Open Door Community Health Centers114 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Arcata
Clinicians with the same Medicare primary specialty in Arcata, CA — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 1979 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1386739845 |
| 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