Quick answers
- Which hospitals does An Nguyen work at?
- Medicare's official clinician data lists An Nguyen at 2 hospitals: HSHS St Elizabeth's Hospital and Mercy Hospital St Louis. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does An Nguyen see patients?
- Medicare's clinician data lists 3 practice locations, including O Fallon, IL, Saint Louis, MO and Effingham, IL. Call before your visit to confirm the address.
- What is An Nguyen's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does An Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says An Nguyen 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 An Nguyen?
- (618) 624-3750, as listed in official Medicare / NPI Registry data.
- What is An Nguyen's NPI number?
- 1134899818. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where An Nguyen works
Medicare's Facility Affiliation Data lists An Nguyen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- HSHS St Elizabeth's HospitalO Fallon, IL · Acute Care Hospital · CCN 140187
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · CCN 260020
Practice locations
Addresses where An Nguyen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1512 N Green Mount RdO Fallon, IL 62269 (618) 624‑3750
- 621 S New Ballas Rd, Suite 560aSaint Louis, MO 63141 (314) 569‑6440
- 801 W Temple AveEffingham, IL 62401 (217) 347‑1690
Group practices
Medicare enrollment lists An Nguyen as a member of these groups (CMS data updated 2026-10-02).
- Mercy Clinic Trauma and General Surgery LLC43 clinicians in the group
- Vituity - Illinois Auc LLP36 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in O Fallon
Clinicians with the same Medicare primary specialty in O Fallon, IL — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Medical school | University Of Texas Medical Branch At Galveston |
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134899818 |
| 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