Quick answers
- Which hospitals does Patrick T. Koo work at?
- Medicare's official clinician data lists Patrick T. Koo at 1 hospital: Providence St. Jude Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Patrick T. Koo see patients?
- Medicare's clinician data lists 5 practice locations, including Diamond Bar, CA and Fullerton, CA. Call before your visit to confirm the address.
- What is Patrick T. Koo's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Gastroenterology.
- Does Patrick T. Koo accept Medicare assignment?
- Yes. Medicare's clinician data says Patrick T. Koo 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.
- Does Patrick T. Koo offer telehealth?
- Medicare's clinician data says Patrick T. Koo offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Patrick T. Koo?
- (909) 860-1144, as listed in official Medicare / NPI Registry data.
- What is Patrick T. Koo's NPI number?
- 1801152772. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Patrick T. Koo works
Medicare's Facility Affiliation Data lists Patrick T. Koo at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Providence St. Jude Medical CenterFullerton, CA · Acute Care Hospital · CCN 050168
Practice locations
Addresses where Patrick T. Koo is enrolled with Medicare (CMS data updated 2026-10-02).
- 1514 Valley Vista DrDiamond Bar, CA 91765 (909) 860‑1144
- 1835 Sunny Crest DrFullerton, CA 92835 (714) 446‑5101
- 1837 Sunny Crest DrFullerton, CA 92835 (714) 446‑5831
- 1950 Sunny Crest Dr, Suite 2900Fullerton, CA 92835 (714) 992‑5350
- 253 S Diamond Bar BlvdDiamond Bar, CA 91765 (909) 860‑1144
Group practices
Medicare enrollment lists Patrick T. Koo as a member of this group (CMS data updated 2026-10-02).
- Providence Medical Foundation1,466 clinicians in the group
Specialties
- Internal Medicineprimary
- Gastroenterologyalso
Other internal medicine doctors in Diamond Bar
Clinicians with the same Medicare primary specialty in Diamond Bar, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Pennsylvania State University College Of Medicine |
| Graduation year | 2012 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1801152772 |
| 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