Quick answers
- Which hospitals does Michael P. Hemmersmeier work at?
- Medicare's official clinician data lists Michael P. Hemmersmeier at 5 hospitals: Mercy Hospital St Louis, SSM St Clare Health Center, SSM St Joseph Health Center, SSM St Joseph Hospital West and St Lukes Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael P. Hemmersmeier see patients?
- Medicare's clinician data lists 2 practice locations, including O Fallon, MO and Saint Louis, MO. Call before your visit to confirm the address.
- What is Michael P. Hemmersmeier's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Michael P. Hemmersmeier accept Medicare assignment?
- Yes. Medicare's clinician data says Michael P. Hemmersmeier 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.
- Does Michael P. Hemmersmeier offer telehealth?
- Medicare's clinician data says Michael P. Hemmersmeier offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Michael P. Hemmersmeier?
- (636) 379-6363, as listed in official Medicare / NPI Registry data.
- What is Michael P. Hemmersmeier's NPI number?
- 1366404832. 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 P. Hemmersmeier works
Medicare's Facility Affiliation Data lists Michael P. Hemmersmeier at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · CCN 260020
- SSM St Clare Health CenterFenton, MO · Acute Care Hospital · CCN 260081
- SSM St Joseph Health CenterSaint Charles, MO · Acute Care Hospital · CCN 260005
- SSM St Joseph Hospital WestLake Saint Louis, MO · Acute Care Hospital · CCN 260200
- St Lukes HospitalChesterfield, MO · Acute Care Hospital · CCN 260179
Practice locations
Addresses where Michael P. Hemmersmeier is enrolled with Medicare (CMS data updated 2026-10-02).
- 1101 Hwy KO Fallon, MO 63366 (636) 379‑6363
- 7212 Balson AveSaint Louis, MO 63130
Group practices
Medicare enrollment lists Michael P. Hemmersmeier as a member of these groups (CMS data updated 2026-10-02).
- SSM Medical Group Inc568 clinicians in the group
- Aging Well Health Care, LLC238 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in O Fallon
Clinicians with the same Medicare primary specialty in O Fallon, MO — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | At Still University Of Health Sciences, College Of Osteo Med, Kirksville |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1366404832 |
| 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