Quick answers
- Which hospitals does Joseph J. Mattern Iii work at?
- Medicare's official clinician data lists Joseph J. Mattern Iii at 2 hospitals: Jefferson Healthcare and Olympic Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Joseph J. Mattern Iii see patients?
- Medicare's clinician data lists 2 practice locations, including Port Townsend, WA. Call before your visit to confirm the address.
- What is Joseph J. Mattern Iii's specialty?
- Medicare lists Family Practice as the primary specialty, and also Obstetrics/Gynecology.
- Does Joseph J. Mattern Iii accept Medicare assignment?
- Yes. Medicare's clinician data says Joseph J. Mattern Iii 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 Joseph J. Mattern Iii?
- (360) 385-2200, as listed in official Medicare / NPI Registry data.
- What is Joseph J. Mattern Iii's NPI number?
- 1023060423. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Joseph J. Mattern Iii works
Medicare's Facility Affiliation Data lists Joseph J. Mattern Iii at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Jefferson HealthcarePort Townsend, WA · Critical Access Hospital · CCN 501323
- Olympic Medical CenterPort Angeles, WA · Acute Care Hospital · CCN 500072
Practice locations
Addresses where Joseph J. Mattern Iii is enrolled with Medicare (CMS data updated 2026-10-02).
- 834 Sheridan StPort Townsend, WA 98368 (360) 385‑2200
- 915 Sheridan StPort Townsend, WA 98368 (360) 379‑8031
Group practices
Medicare enrollment lists Joseph J. Mattern Iii as a member of this group (CMS data updated 2026-10-02).
- Jefferson County Public Hospital District No 2147 clinicians in the group
Specialties
- Family Practiceprimary
- Obstetrics/Gynecologyalso
Other family doctors in Port Townsend
Clinicians with the same Medicare primary specialty in Port Townsend, WA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1023060423 |
| 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