Quick answers
- Which hospitals does Leigh C. Chao work at?
- Medicare's official clinician data lists Leigh C. Chao at 3 hospitals: Christian Hospital Northeast, Memorial Hospital and OSF Saint Anthony's Health Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Leigh C. Chao see patients?
- Medicare's clinician data lists 4 practice locations, including Alton, IL, Saint Louis, MO and Florissant, MO. Call before your visit to confirm the address.
- What is Leigh C. Chao's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Emergency Medicine.
- Does Leigh C. Chao accept Medicare assignment?
- Yes. Medicare's clinician data says Leigh C. Chao 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 Leigh C. Chao?
- (618) 465-2571, as listed in official Medicare / NPI Registry data.
- What is Leigh C. Chao's NPI number?
- 1922081348. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Leigh C. Chao works
Medicare's Facility Affiliation Data lists Leigh C. Chao at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Christian Hospital NortheastSaint Louis, MO · Acute Care Hospital · CCN 260180
- Memorial HospitalChester, IL · Critical Access Hospital · CCN 141338
- OSF Saint Anthony's Health CenterAlton, IL · Acute Care Hospital · CCN 140052
Practice locations
Addresses where Leigh C. Chao is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Saint Anthonys WayAlton, IL 62002 (618) 465‑2571
- 11133 Dunn RdSaint Louis, MO 63136 (314) 362‑9123
- 1225 Graham RdFlorissant, MO 63031 (314) 362‑9123
- 1900 State StChester, IL 62233 (618) 826‑4581
Group practices
Medicare enrollment lists Leigh C. Chao as a member of these groups (CMS data updated 2026-10-02).
- Washington University Community Specialists LLC105 clinicians in the group
- Memorial Hospital30 clinicians in the group
- Alton-Griffin Emergency Group PC18 clinicians in the group
Specialties
- Internal Medicineprimary
- Emergency Medicinealso
Other internal medicine doctors in Alton
Clinicians with the same Medicare primary specialty in Alton, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Saint Louis University School Of Medicine |
| Graduation year | 1996 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922081348 |
| 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