Quick answers
- Which hospitals does Abraham Chung work at?
- Medicare's official clinician data lists Abraham Chung at 5 hospitals: Contra Costa Regional Medical Center, John Muir Medical Center - Concord Campus, John Muir Medical Center - Walnut Creek Campus, San Ramon Regional Medical Center and UCSF Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Abraham Chung see patients?
- Medicare's clinician data lists 1 practice location in Concord, CA. Call before your visit to confirm the address.
- What is Abraham Chung's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Abraham Chung accept Medicare assignment?
- Yes. Medicare's clinician data says Abraham Chung 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 Abraham Chung?
- (925) 674-0500, as listed in official Medicare / NPI Registry data.
- What is Abraham Chung's NPI number?
- 1104845858. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Abraham Chung works
Medicare's Facility Affiliation Data lists Abraham Chung 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
- San Ramon Regional Medical CenterSan Ramon, CA · Acute Care Hospital · CCN 050689
- UCSF Medical CenterSan Francisco, CA · Acute Care Hospital · CCN 050454
Practice locations
Addresses where Abraham Chung is enrolled with Medicare (CMS data updated 2026-10-02).
- 2700 Grant St, Suite 200Concord, CA 94520 (925) 674‑0500
Group practices
Medicare enrollment lists Abraham Chung as a member of this group (CMS data updated 2026-10-02).
- John Muir Physician Network494 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Concord
Clinicians with the same Medicare primary specialty in Concord, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1104845858 |
| 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