Quick answers
- Which hospitals does Michael O. Hessel work at?
- Medicare's official clinician data lists Michael O. Hessel at 4 hospitals: HSHS St Elizabeth's Hospital, Mercy Hospital South, Mercy Hospital St Louis and SSM St Clare Health Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael O. Hessel see patients?
- Medicare's clinician data lists 1 practice location in Saint Louis, MO. Call before your visit to confirm the address.
- What is Michael O. Hessel's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Michael O. Hessel accept Medicare assignment?
- Yes. Medicare's clinician data says Michael O. Hessel 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 O. Hessel?
- (314) 645-4434, as listed in official Medicare / NPI Registry data.
- What is Michael O. Hessel's NPI number?
- 1902312259. 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 O. Hessel works
Medicare's Facility Affiliation Data lists Michael O. Hessel 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 SouthSaint Louis, MO · Acute Care Hospital · CCN 260077
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · CCN 260020
- SSM St Clare Health CenterFenton, MO · Acute Care Hospital · CCN 260081
Practice locations
Addresses where Michael O. Hessel is enrolled with Medicare (CMS data updated 2026-10-02).
- 520 S Elm Ave, Saint Louis RheumatologySaint Louis, MO 63119 (314) 645‑4434
Group practices
Medicare enrollment lists Michael O. Hessel as a member of this group (CMS data updated 2026-10-02).
- Clayton Medical Associates PC5 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Clinician information
| Graduation year | 2018 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1902312259 |
| 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