Quick answers
- Where does Spencer J. Mares see patients?
- Medicare's clinician data lists 1 practice location in Saint Charles, MO. Call before your visit to confirm the address.
- What is Spencer J. Mares's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Spencer J. Mares accept Medicare assignment?
- Yes. Medicare's clinician data says Spencer J. Mares 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 Spencer J. Mares?
- (636) 498-5850, as listed in official Medicare / NPI Registry data.
- What is Spencer J. Mares's NPI number?
- 1437667490. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Spencer J. Mares is enrolled with Medicare (CMS data updated 2026-10-02).
- 1475 Kisker Rd, Suite 200Saint Charles, MO 63304 (636) 498‑5850
Group practices
Medicare enrollment lists Spencer J. Mares as a member of this group (CMS data updated 2026-10-02).
- SSM Medical Group Inc568 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Saint Charles
Clinicians with the same Medicare primary specialty in Saint Charles, MO — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1437667490 |
| 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
- 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