Quick answers
- Which hospitals does Gary L. Treece work at?
- Medicare's official clinician data lists Gary L. Treece at 2 hospitals: Astria Sunnyside Hospital and Yakima Valley Memorial. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gary L. Treece see patients?
- Medicare's clinician data lists 1 practice location in Union Gap, WA. Call before your visit to confirm the address.
- What is Gary L. Treece's specialty?
- Medicare lists Endocrinology as the primary specialty.
- Does Gary L. Treece accept Medicare assignment?
- Yes. Medicare's clinician data says Gary L. Treece 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 Gary L. Treece?
- (509) 454-7700, as listed in official Medicare / NPI Registry data.
- What is Gary L. Treece's NPI number?
- 1447269857. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gary L. Treece works
Medicare's Facility Affiliation Data lists Gary L. Treece at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Astria Sunnyside HospitalSunnyside, WA · Critical Access Hospital · CCN 501330
- Yakima Valley MemorialYakima, WA · Acute Care Hospital · CCN 500036
Practice locations
Addresses where Gary L. Treece is enrolled with Medicare (CMS data updated 2026-10-02).
- 1420 Ahtanum Ridge DrUnion Gap, WA 98903 (509) 454‑7700
Group practices
Medicare enrollment lists Gary L. Treece as a member of this group (CMS data updated 2026-10-02).
- SHC Medical Center Toppenish41 clinicians in the group
Specialties
- Endocrinologyprimary
Other endocrinologists in Washington
Clinicians with the same Medicare primary specialty in Washington — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Irvine, California College Of Medicine |
| Graduation year | 1971 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447269857 |
| 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