Sydney Thayer, MD
NPI 1427581768 · Obstetrics & Gynecology Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sydney Thayer, MD is a Obstetrics & Gynecology Physician provider in Saint Louis, MO (NPI 1427581768).
Provider details
- NPI number
- 1427581768
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 2021016990 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-04-04
- Last updated
- 2025-04-17
Frequently asked questions
- What is Sydney Thayer's NPI number?
- Sydney Thayer's National Provider Identifier (NPI) is 1427581768, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sydney Thayer's specialty?
- Sydney Thayer is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Sydney Thayer located?
- Sydney Thayer's practice location on file with NPPES is 4901 Forest Park Ave, Saint Louis, MO 63108-1495.
- What is Sydney Thayer's phone number?
- The practice phone number listed in the NPPES registry for Sydney Thayer is (314) 454-8181.
- Does Sydney Thayer accept Medicare?
- Sydney Thayer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sydney Thayer's NPI active?
- Yes — Sydney Thayer's NPI (1427581768) is active in the NPPES registry as of the last update on 2025-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.