Quick answers
- Which hospitals does Gilbert K. Ong work at?
- Medicare's official clinician data lists Gilbert K. Ong at 3 hospitals: Astria Sunnyside Hospital, Astria Toppenish Hospital and Yakima Valley Memorial. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gilbert K. Ong see patients?
- Medicare's clinician data lists 2 practice locations, including Union Gap, WA and Zillah, WA. Call before your visit to confirm the address.
- What is Gilbert K. Ong's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Gilbert K. Ong accept Medicare assignment?
- Yes. Medicare's clinician data says Gilbert K. Ong 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 Gilbert K. Ong?
- (509) 454-7700, as listed in official Medicare / NPI Registry data.
- What is Gilbert K. Ong's NPI number?
- 1740310283. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gilbert K. Ong works
Medicare's Facility Affiliation Data lists Gilbert K. Ong 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
- Astria Toppenish HospitalToppenish, WA · Acute Care Hospital · CCN 500037
- Yakima Valley MemorialYakima, WA · Acute Care Hospital · CCN 500036
Practice locations
Addresses where Gilbert K. Ong is enrolled with Medicare (CMS data updated 2026-10-02).
- 1420 Ahtanum Ridge DrUnion Gap, WA 98903 (509) 454‑7700
- 915 Vintage Valley Pkwy, Suite 200Zillah, WA 98953 (509) 829‑5151
Group practices
Medicare enrollment lists Gilbert K. Ong as a member of these groups (CMS data updated 2026-10-02).
- Sunnyside Community Hospital Association57 clinicians in the group
- SHC Medical Center Toppenish41 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Washington
Clinicians with the same Medicare primary specialty in Washington — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1997 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1740310283 |
| 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