Quick answers
- Which hospitals does Mariel Bailey work at?
- Medicare's official clinician data lists Mariel Bailey at 2 hospitals: Kaiser Foundation Hospital - Antioch and Kaiser Foundation Hospital - Walnut Creek. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mariel Bailey see patients?
- Medicare's clinician data lists 1 practice location in Antioch, CA. Call before your visit to confirm the address.
- What is Mariel Bailey's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Gastroenterology.
- Does Mariel Bailey accept Medicare assignment?
- Yes. Medicare's clinician data says Mariel Bailey 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 Mariel Bailey offer telehealth?
- Medicare's clinician data says Mariel Bailey offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mariel Bailey?
- (925) 813-6500, as listed in official Medicare / NPI Registry data.
- What is Mariel Bailey's NPI number?
- 1710415435. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mariel Bailey works
Medicare's Facility Affiliation Data lists Mariel Bailey at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Kaiser Foundation Hospital - AntiochAntioch, CA · Acute Care Hospital · CCN 050760
- Kaiser Foundation Hospital - Walnut CreekWalnut Creek, CA · Acute Care Hospital · CCN 050072
Practice locations
Addresses where Mariel Bailey is enrolled with Medicare (CMS data updated 2026-10-02).
- 4501 Sand Creek RdAntioch, CA 94531 (925) 813‑6500
Group practices
Medicare enrollment lists Mariel Bailey as a member of this group (CMS data updated 2026-10-02).
- Permanente Medical Group Inc10,996 clinicians in the group
Specialties
- Internal Medicineprimary
- Gastroenterologyalso
Other internal medicine doctors in Antioch
Clinicians with the same Medicare primary specialty in Antioch, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1710415435 |
| 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