Quick answers
- Which hospitals does Willem Xu work at?
- Medicare's official clinician data lists Willem Xu at 3 hospitals: Pomona Valley Hospital Medical Center, Providence St Mary Medical Center and San Antonio Regional Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Willem Xu see patients?
- Medicare's clinician data lists 1 practice location in Modesto, CA. Call before your visit to confirm the address.
- What is Willem Xu's specialty?
- Medicare lists Anesthesiology as the primary specialty.
- Does Willem Xu accept Medicare assignment?
- Yes. Medicare's clinician data says Willem Xu 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 Willem Xu?
- (209) 572-3224, as listed in official Medicare / NPI Registry data.
- What is Willem Xu's NPI number?
- 1013570480. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Willem Xu works
Medicare's Facility Affiliation Data lists Willem Xu at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Pomona Valley Hospital Medical CenterPomona, CA · Acute Care Hospital · CCN 050231
- Providence St Mary Medical CenterApple Valley, CA · Acute Care Hospital · CCN 050300
- San Antonio Regional HospitalUpland, CA · Acute Care Hospital · CCN 050099
Practice locations
Addresses where Willem Xu is enrolled with Medicare (CMS data updated 2026-10-02).
- 609 E Orangeburg Ave, Bldg BModesto, CA 95350 (209) 572‑3224
Group practices
Medicare enrollment lists Willem Xu as a member of this group (CMS data updated 2026-10-02).
- Allied Anesthesia Medical Group Inc191 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Modesto
Clinicians with the same Medicare primary specialty in Modesto, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2020 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1013570480 |
| 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