Quick answers
- Which hospitals does Thomas L. Nickolas work at?
- Medicare's official clinician data lists Thomas L. Nickolas at 5 hospitals: Barnes Jewish Hospital, Barnes-Jewish St Peters Hospital, Barnes-Jewish West County Hospital, Memorial Hospital and Missouri Baptist Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Thomas L. Nickolas see patients?
- Medicare's clinician data lists 1 practice location in Saint Louis, MO. Call before your visit to confirm the address.
- What is Thomas L. Nickolas's specialty?
- Medicare lists Endocrinology as the primary specialty, and also Nephrology.
- Does Thomas L. Nickolas accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas L. Nickolas 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 Thomas L. Nickolas offer telehealth?
- Medicare's clinician data says Thomas L. Nickolas offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Thomas L. Nickolas?
- (314) 454-7775, as listed in official Medicare / NPI Registry data.
- What is Thomas L. Nickolas's NPI number?
- 1558438788. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Thomas L. Nickolas works
Medicare's Facility Affiliation Data lists Thomas L. Nickolas at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Barnes Jewish HospitalSaint Louis, MO · Acute Care Hospital · CCN 260032
- Barnes-Jewish St Peters HospitalSaint Peters, MO · Acute Care Hospital · CCN 260191
- Barnes-Jewish West County HospitalCreve Coeur, MO · Acute Care Hospital · CCN 260162
- Memorial HospitalBelleville, IL · Acute Care Hospital · CCN 140185
- Missouri Baptist Medical CenterSaint Louis, MO · Acute Care Hospital · CCN 260108
Practice locations
Addresses where Thomas L. Nickolas is enrolled with Medicare (CMS data updated 2026-10-02).
- 4921 Parkview Pl, Suite 5cSaint Louis, MO 63110 (314) 454‑7775
Group practices
Medicare enrollment lists Thomas L. Nickolas as a member of this group (CMS data updated 2026-10-02).
- Washington University3,029 clinicians in the group
Specialties
- Endocrinologyprimary
- Nephrologyalso
Other endocrinologists in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Pittsburgh School Of Medicine |
| Graduation year | 1998 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1558438788 |
| 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