Quick answers
- Which hospitals does Yenjean Hwang work at?
- Medicare's official clinician data lists Yenjean Hwang at 5 hospitals: Alta Bates Summit Medical Center, Alta Bates Summit Medical Center - Alta Bates Camp…, Eden Medical Center, John Muir Medical Center - Walnut Creek Campus and Stanford Health Care. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Yenjean Hwang see patients?
- Medicare's clinician data lists 2 practice locations, including Orinda, CA. Call before your visit to confirm the address.
- What is Yenjean Hwang's specialty?
- Medicare lists Infectious Disease as the primary specialty, and also Internal Medicine.
- Does Yenjean Hwang accept Medicare assignment?
- Yes. Medicare's clinician data says Yenjean Hwang 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 Yenjean Hwang offer telehealth?
- Medicare's clinician data says Yenjean Hwang offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Yenjean Hwang?
- (925) 254-3805, as listed in official Medicare / NPI Registry data.
- What is Yenjean Hwang's NPI number?
- 1194744557. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Yenjean Hwang works
Medicare's Facility Affiliation Data lists Yenjean Hwang at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Alta Bates Summit Medical CenterOakland, CA · Acute Care Hospital · CCN 050043
- Alta Bates Summit Medical Center - Alta Bates Camp…Berkeley, CA · Acute Care Hospital · CCN 050305
- Eden Medical CenterCastro Valley, CA · Acute Care Hospital · CCN 050488
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · CCN 050180
- Stanford Health CareStanford, CA · Acute Care Hospital · CCN 050441
Practice locations
Addresses where Yenjean Hwang is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Country Club Plaza, Medical GroupOrinda, CA 94563 (925) 254‑3805
- 1 Country Club PlzOrinda, CA 94563 (925) 254‑3805
Group practices
Medicare enrollment lists Yenjean Hwang as a member of this group (CMS data updated 2026-10-02).
- Whiting and Whiting, a Professional Corp2 clinicians in the group
Specialties
- Infectious Diseaseprimary
- Internal Medicinealso
Other infectious disease doctors in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Chicago, Pritzker School Of Medicine |
| Graduation year | 1994 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1194744557 |
| 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