Quick answers
- Which hospitals does Sydney M. Thayer work at?
- Medicare's official clinician data lists Sydney M. Thayer at 2 hospitals: Barnes Jewish Hospital and Missouri Baptist Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sydney M. Thayer see patients?
- Medicare's clinician data lists 9 practice locations, including Saint Louis, MO, Shiloh, IL and St Louis, MO. Call before your visit to confirm the address.
- What is Sydney M. Thayer's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Sydney M. Thayer accept Medicare assignment?
- Yes. Medicare's clinician data says Sydney M. Thayer 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 Sydney M. Thayer?
- (314) 362-7200, as listed in official Medicare / NPI Registry data.
- What is Sydney M. Thayer's NPI number?
- 1427581768. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sydney M. Thayer works
Medicare's Facility Affiliation Data lists Sydney M. Thayer 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
- Missouri Baptist Medical CenterSaint Louis, MO · Acute Care Hospital · CCN 260108
Practice locations
Addresses where Sydney M. Thayer is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 9; the Medicare profile lists all.
- 1 Barnes Jew Hosp PlzSaint Louis, MO 63110 (314) 362‑7200
- 1414 Cross StShiloh, IL 62269 (314) 454‑5437
- 3015 N Ballas RdSaint Louis, MO 63131 (314) 996‑6000
- 3023 N Ballas Rd, Suite 450dSaint Louis, MO 63131 (314) 286‑2400
- 4901 Forest Park AveSaint Louis, MO 63108
Group practices
Medicare enrollment lists Sydney M. Thayer as a member of these groups (CMS data updated 2026-10-02).
- Washington University3,029 clinicians in the group
- Washington University Physicians in Illinois Inc175 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs 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 California, San Diego School Of Medicine |
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1427581768 |
| 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