Quick answers
- Which hospitals does Michael J. Fleissner work at?
- Medicare's official clinician data lists Michael J. Fleissner at 3 hospitals: Anderson Hospital, Community Hospital of Staunton and Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael J. Fleissner see patients?
- Medicare's clinician data lists 11 practice locations, including Alton, IL, Saint Louis, MO and Florissant, MO. Call before your visit to confirm the address.
- What is Michael J. Fleissner's specialty?
- Medicare lists Interventional Cardiology as the primary specialty, and also Cardiovascular Disease (Cardiology).
- Does Michael J. Fleissner accept Medicare assignment?
- Yes. Medicare's clinician data says Michael J. Fleissner 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 Michael J. Fleissner?
- (618) 463-7240, as listed in official Medicare / NPI Registry data.
- What is Michael J. Fleissner's NPI number?
- 1942289459. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Michael J. Fleissner works
Medicare's Facility Affiliation Data lists Michael J. Fleissner at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Anderson HospitalMaryville, IL · Acute Care Hospital · CCN 140289
- Community Hospital of StauntonStaunton, IL · Critical Access Hospital · CCN 141306
- Memorial HospitalBelleville, IL · Acute Care Hospital · CCN 140185
Practice locations
Addresses where Michael J. Fleissner is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 11; the Medicare profile lists all.
- 1 Memorial DrAlton, IL 62002 (618) 463‑7240
- 11133 Dunn RdSaint Louis, MO 63136 (314) 653‑5643
- 11133 Dunn Rd, Suite 2427Saint Louis, MO 63136 (314) 653‑5643
- 11155 Dunn Rd, Suite 109nSaint Louis, MO 63136 (314) 953‑8799
- 1225 Graham Rd, Suite 1220bFlorissant, MO 63031 (618) 466‑6616
Group practices
Medicare enrollment lists Michael J. Fleissner as a member of this group (CMS data updated 2026-10-02).
- Fairview Heights Medical Group SC444 clinicians in the group
Specialties
Other interventional cardiologists in Alton
Clinicians with the same Medicare primary specialty in Alton, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 1986 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1942289459 |
| 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