Quick answers
- Which hospitals does Gemma T. Ko work at?
- Medicare's official clinician data lists Gemma T. Ko at 1 hospital: PIH Health Hospital-Whittier. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gemma T. Ko see patients?
- Medicare's clinician data lists 1 practice location in Pico Rivera, CA. Call before your visit to confirm the address.
- What is Gemma T. Ko's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Gemma T. Ko accept Medicare assignment?
- Yes. Medicare's clinician data says Gemma T. Ko 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 Gemma T. Ko?
- (562) 692-3388, as listed in official Medicare / NPI Registry data.
- What is Gemma T. Ko's NPI number?
- 1437167715. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gemma T. Ko works
Medicare's Facility Affiliation Data lists Gemma T. Ko at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- PIH Health Hospital-WhittierWhittier, CA · Acute Care Hospital · CCN 050169
Practice locations
Addresses where Gemma T. Ko is enrolled with Medicare (CMS data updated 2026-10-02).
- 4511 Rosemead BlvdPico Rivera, CA 90660 (562) 692‑3388
Group practices
Medicare enrollment lists Gemma T. Ko as a member of this group (CMS data updated 2026-10-02).
- Gemma TH Ko, MD. Inc.2 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Pico Rivera
Clinicians with the same Medicare primary specialty in Pico Rivera, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Hawaii John A. Burns School Of Medicine |
| Graduation year | 1990 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1437167715 |
| 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