Quick answers
- Which hospitals does James Diep work at?
- Medicare's official clinician data lists James Diep at 3 hospitals: 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 James Diep see patients?
- Medicare's clinician data lists 2 practice locations, including Martinez, CA and Antioch, CA. Call before your visit to confirm the address.
- What is James Diep's specialty?
- Medicare lists Podiatry as the primary specialty.
- Does James Diep accept Medicare assignment?
- Yes. Medicare's clinician data says James Diep 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 James Diep?
- (925) 979-8313, as listed in official Medicare / NPI Registry data.
- What is James Diep's NPI number?
- 1740939404. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where James Diep works
Medicare's Facility Affiliation Data lists James Diep at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- 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 James Diep is enrolled with Medicare (CMS data updated 2026-10-02).
- 1815 Arnold DrMartinez, CA 94553 (925) 979‑8313
- 3700 Sunset Ln, Suite 1Antioch, CA 94509 (925) 979‑8313
Group practices
Medicare enrollment lists James Diep as a member of this group (CMS data updated 2026-10-02).
- Sun Healthcare and Surgery Group Inc6 clinicians in the group
Specialties
- Podiatryprimary
Other podiatrists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | DPM |
|---|---|
| Medical school | California School Of Podiatric Medicine |
| Graduation year | 2022 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1740939404 |
| 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