Quick answers
- Which hospitals does Nicholas J. Mayer work at?
- Medicare's official clinician data lists Nicholas J. Mayer at 5 hospitals: Alton Memorial Hospital, Christian Hospital Northeast, Gateway Regional Medical Center, Memorial Hospital and SSM Health Depaul Hospital St Louis. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Nicholas J. Mayer see patients?
- Medicare's clinician data lists 3 practice locations, including Florissant, MO, Festus, MO and Granite City, IL. Call before your visit to confirm the address.
- What is Nicholas J. Mayer's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Nephrology.
- Does Nicholas J. Mayer accept Medicare assignment?
- Yes. Medicare's clinician data says Nicholas J. Mayer 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 Nicholas J. Mayer offer telehealth?
- Medicare's clinician data says Nicholas J. Mayer offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Nicholas J. Mayer?
- (314) 741-1600, as listed in official Medicare / NPI Registry data.
- What is Nicholas J. Mayer's NPI number?
- 1104075597. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Nicholas J. Mayer works
Medicare's Facility Affiliation Data lists Nicholas J. Mayer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Alton Memorial HospitalAlton, IL · Acute Care Hospital · CCN 140002
- Christian Hospital NortheastSaint Louis, MO · Acute Care Hospital · CCN 260180
- Gateway Regional Medical CenterGranite City, IL · Acute Care Hospital · CCN 140125
- Memorial HospitalBelleville, IL · Acute Care Hospital · CCN 140185
- SSM Health Depaul Hospital St LouisBridgeton, MO · Acute Care Hospital · CCN 260104
Practice locations
Addresses where Nicholas J. Mayer is enrolled with Medicare (CMS data updated 2026-10-02).
- 1265 Graham Rd, Suite 1Florissant, MO 63031 (314) 741‑1600
- 1400 US Hwy 61, Suite 240aFestus, MO 63028 (636) 937‑3337
- 2044 Madison AveGranite City, IL 62040 (314) 741‑1600
Group practices
Medicare enrollment lists Nicholas J. Mayer as a member of this group (CMS data updated 2026-10-02).
- St Louis Kidney Care LLC8 clinicians in the group
Specialties
- Internal Medicineprimary
- Nephrologyalso
Other internal medicine doctors in Florissant
Clinicians with the same Medicare primary specialty in Florissant, MO — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | At Still University Of Health Sciences, College Of Osteo Med, Kirksville |
| Graduation year | 2004 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1104075597 |
| 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