Quick answers
- Which hospitals does Jay J. Guan work at?
- Medicare's official clinician data lists Jay J. Guan at 1 hospital: St Johns Regional Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jay J. Guan see patients?
- Medicare's clinician data lists 2 practice locations, including Oxnard, CA and Camarillo, CA. Call before your visit to confirm the address.
- What is Jay J. Guan's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Jay J. Guan accept Medicare assignment?
- Yes. Medicare's clinician data says Jay J. Guan 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 Jay J. Guan offer telehealth?
- Medicare's clinician data says Jay J. Guan offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Jay J. Guan?
- (805) 983-0521, as listed in official Medicare / NPI Registry data.
- What is Jay J. Guan's NPI number?
- 1295122497. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jay J. Guan works
Medicare's Facility Affiliation Data lists Jay J. Guan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- St Johns Regional Medical CenterOxnard, CA · Acute Care Hospital · CCN 050082
Practice locations
Addresses where Jay J. Guan is enrolled with Medicare (CMS data updated 2026-10-02).
- 2241 Wankel Way, Suite AOxnard, CA 93030 (805) 983‑0521
- 4005 Mission Oaks Blvd, Suite ACamarillo, CA 93012 (805) 484‑7921
Group practices
Medicare enrollment lists Jay J. Guan as a member of this group (CMS data updated 2026-10-02).
- Genesis Healthcare Partners PC228 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Oxnard
Clinicians with the same Medicare primary specialty in Oxnard, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1295122497 |
| 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