Quick answers
- Which hospitals does Jiyon Choi work at?
- Medicare's official clinician data lists Jiyon Choi at 4 hospitals: Contra Costa Regional Medical Center, John Muir Medical Center - Concord Campus, John Muir Medical Center - Walnut Creek Campus and Sutter Delta Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jiyon Choi see patients?
- Medicare's clinician data lists 1 practice location in Antioch, CA. Call before your visit to confirm the address.
- What is Jiyon Choi's specialty?
- Medicare lists Hematology/Oncology as the primary specialty.
- Does Jiyon Choi accept Medicare assignment?
- Yes. Medicare's clinician data says Jiyon Choi 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 Jiyon Choi offer telehealth?
- Medicare's clinician data says Jiyon Choi offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Jiyon Choi?
- (925) 778-0679, as listed in official Medicare / NPI Registry data.
- What is Jiyon Choi's NPI number?
- 1144437567. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jiyon Choi works
Medicare's Facility Affiliation Data lists Jiyon Choi at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Contra Costa Regional Medical CenterMartinez, CA · Acute Care Hospital · CCN 050276
- John Muir Medical Center - Concord CampusConcord, CA · Acute Care Hospital · CCN 050496
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · CCN 050180
- Sutter Delta Medical CenterAntioch, CA · Acute Care Hospital · CCN 050523
Practice locations
Addresses where Jiyon Choi is enrolled with Medicare (CMS data updated 2026-10-02).
- 4721 Dallas Ranch RdAntioch, CA 94531 (925) 778‑0679
Group practices
Medicare enrollment lists Jiyon Choi as a member of this group (CMS data updated 2026-10-02).
- Epic Care55 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Antioch
Clinicians with the same Medicare primary specialty in Antioch, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2003 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1144437567 |
| 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