Quick answers
- Which hospitals does Ata Siddiqui work at?
- Medicare's official clinician data lists Ata Siddiqui at 4 hospitals: HSHS St Elizabeth's Hospital, Memorial Hospital, St Anthonys Memorial Hospital and St Joseph's Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ata Siddiqui see patients?
- Medicare's clinician data lists 4 practice locations, including O Fallon, IL, Berwyn, IL and Effingham, IL. Call before your visit to confirm the address.
- What is Ata Siddiqui's specialty?
- Medicare lists Anesthesiology as the primary specialty.
- Does Ata Siddiqui accept Medicare assignment?
- Yes. Medicare's clinician data says Ata Siddiqui 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 Ata Siddiqui?
- (618) 234-2120, as listed in official Medicare / NPI Registry data.
- What is Ata Siddiqui's NPI number?
- 1043206618. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ata Siddiqui works
Medicare's Facility Affiliation Data lists Ata Siddiqui 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
- Memorial HospitalBelleville, IL · Acute Care Hospital · CCN 140185
- St Anthonys Memorial HospitalEffingham, IL · Acute Care Hospital · CCN 140032
- St Joseph's HospitalHighland, IL · Critical Access Hospital · CCN 141336
Practice locations
Addresses where Ata Siddiqui is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Saint Elizabeth BlvdO Fallon, IL 62269 (618) 234‑2120
- 3249 Oak Park AveBerwyn, IL 60402 (708) 783‑9100
- 503 N Maple StEffingham, IL 62401 (217) 342‑2121
- 9515 Holy Cross LnBreese, IL 62230 (618) 526‑4511
Group practices
Medicare enrollment lists Ata Siddiqui as a member of this group (CMS data updated 2026-10-02).
- North American Partners in Anesthesia Illinois LLC431 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in O Fallon
Clinicians with the same Medicare primary specialty in O Fallon, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1043206618 |
| 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