Quick answers
- Which hospitals does Bassim Assioun work at?
- Medicare's official clinician data lists Bassim Assioun at 5 hospitals: HSHS St Elizabeth's Hospital, Memorial Hospital, St Johns Hospital, St Joseph's Hospital and St Josephs Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Bassim Assioun see patients?
- Medicare's clinician data lists 5 practice locations, including Ofallon, IL, Decatur, IL and Belleville, IL. Call before your visit to confirm the address.
- What is Bassim Assioun's specialty?
- Medicare lists Nephrology as the primary specialty.
- Does Bassim Assioun accept Medicare assignment?
- Yes. Medicare's clinician data says Bassim Assioun 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 Bassim Assioun?
- (618) 624-5510, as listed in official Medicare / NPI Registry data.
- What is Bassim Assioun's NPI number?
- 1669785408. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Bassim Assioun works
Medicare's Facility Affiliation Data lists Bassim Assioun 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 Johns HospitalSpringfield, IL · Acute Care Hospital · CCN 140053
- St Joseph's HospitalHighland, IL · Critical Access Hospital · CCN 141336
- St Josephs HospitalBreese, IL · Acute Care Hospital · CCN 140145
Practice locations
Addresses where Bassim Assioun is enrolled with Medicare (CMS data updated 2026-10-02).
- 1512 N Green Mount Rd, Suite 108Ofallon, IL 62269 (618) 624‑5510
- 1900 E Lake Shore Dr, Suite 330Decatur, IL 62521 (217) 423‑2889
- 4500 Memorial DrBelleville, IL 62226 (618) 233‑7750
- 904 Medical Park DrEffingham, IL 62401 (217) 540‑2350
- 9515 Holy Cross LaneBreese, IL 62230 (618) 526‑4511
Group practices
Medicare enrollment lists Bassim Assioun as a member of this group (CMS data updated 2026-10-02).
- HSHS Medical Group Inc219 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2008 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669785408 |
| 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