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DR. SYDNEY MARIE THAYER MD
NPI 1427581768
Obstetrics & Gynecology in Saint Louis, MO

Active since April 04, 2017PECOS EnrolledAccepts Medicare Assignment
4901 FOREST PARK AVE, DIV OBGYN MFM AND US, STE 710, SAINT LOUIS, MO 63108(314) 454-8181(314) 747-1429 Get Directions Write a Review

NPPES record last updated: April 17, 2025. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Nov 19, 2024, Apr 25, 2024, Apr 10, 2024 and 2 more (5 updates tracked since 2021).

About Dr. Sydney Marie Thayer Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. SYDNEY MARIE THAYER MD (NPI 1427581768) is an individual obstetrics & gynecology provider in Saint Louis, Missouri, licensed in Missouri (2021016990) and active in the NPI registry since April 2017. She is enrolled in Medicare PECOS, is affiliated with Barnes Jewish Hospital, and is a graduate of University Of California, San Diego School Of Medicine (2017).

NPPES Registry Identity

NPI1427581768
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameDR. SYDNEY MARIE THAYERCredential: MD
Location Address4901 FOREST PARK AVE, DIV OBGYN MFM AND US, STE 710Saint Louis, MO 63108-1495
Mailing AddressPo Box 7412011Chicago, IL 60674-2011 · (314) 454-8181 · Fax (314) 747-1429
Phone(314) 454-8181
Fax(314) 747-1429
Sole ProprietorNo
Medical School CMSUniversity Of California, San Diego School Of MedicineGraduated 2017
Enumeration DateApril 4, 2017
Last NPPES UpdateApril 17, 20255 updates tracked since enumeration
✔ NPI 1427581768 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in MO · 2021016990
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
Also ListedObstetrics & Gynecology · Maternal & Fetal MedicineTaxonomy 207VM0101X · License 2021016990 (MO)
4901 FOREST PARK AVE, Saint Louis, MO 63108
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Other Identifiers 1

Medicaid200097022MO

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Cox HealthPlans.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Sydney Marie Thayer Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID648544890
PECOS Enrollment IDI20210723001509, I20241016001576
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Barnes Jewish Hospital

Acute Care Hospitals · Saint Louis, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number260032
LocationOne Barnes-Jewish Hospital PlazaSaint Louis, MO 63110 · St. Louis City County
Emergency services Birthing friendly

Missouri Baptist Medical Center

Acute Care Hospitals · Town And Country, MO
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260108
Location3015 N Ballas RdTown And Country, MO 63131 · St. Louis County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63108 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$69.50 typical visit price
range $17.76 – $137.92
Typical copayment $17.37 (range $4.44 – $34.48)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. ERIN LEIGH DYER MD
General Practice
4901 FOREST PARK AVE, DIV IM GENERAL MED, STE 241
SAINT LOUIS, MO 63108
St. Louis City (314) 362-5060
DR. NICHOLE GALLEGOS ZEHNDER MD
General Practice
4901 FOREST PARK AVE, DIV IM GENERAL MED, STE 241
SAINT LOUIS, MO 63108
St. Louis City (314) 362-5060
MRS. NANCY J CIBULKA WHNP
Nurse Practitioner (Family)
4901 FOREST PARK AVE, STE 341
SAINT LOUIS, MO 63108
St. Louis City (314) 454-7882
DR. MARCIA J MCCABE PSYD
Psychologist
4901 FOREST PARK AVE, DEPT PSYCHIATRY, STE 441
SAINT LOUIS, MO 63108
St. Louis City (314) 286-1700
WASHINGTON UNIVERSITY
Clinic/Center (Multi-Specialty)
4901 FOREST PARK AVE
SAINT LOUIS, MO 63108
St. Louis City (314) 362-3937
DR. JING-WEI HUANG MD
Ophthalmology (Cornea and External Diseases Specialist)
4901 FOREST PARK AVE, DEPT OPHTHALMOLOGY, 6TH FL
SAINT LOUIS, MO 63108
St. Louis City (314) 362-3937
DR. JILLIAN MEI-LING LIU MD PHD
Ophthalmology (Cornea and External Diseases Specialist)
4901 FOREST PARK AVE, DEPT OPHTHALMOLOGY, 6TH FL
SAINT LOUIS, MO 63108
St. Louis City (314) 362-3937
DR. DAVID L EISENBERG MD
Obstetrics & Gynecology (Gynecology)
4901 FOREST PARK AVE, DIV OBGYN FAMILY PLANNING, STE 710
SAINT LOUIS, MO 63108
St. Louis City (314) 362-4211

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Sydney Thayer's NPI number?

The NPI number for Sydney Thayer is 1427581768. It was assigned to this individual provider in the NPPES registry on April 4, 2017.

Where is Sydney Thayer located?

Sydney Thayer practices at 4901 Forest Park Ave Div Obgyn Mfm And Us, Ste 710, Saint Louis, MO 63108. The listed phone number is (314) 454-8181.

What is Sydney Thayer's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Sydney Thayer enrolled in Medicare?

Yes. Sydney Thayer is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Sydney Thayer accept?

Health plans from Cox HealthPlans list Sydney Thayer as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Sydney Thayer affiliated with any hospitals?

According to CMS data, Sydney Thayer is affiliated with Barnes Jewish Hospital and Missouri Baptist Medical Center.

When was this NPI record last updated?

The NPPES record for Sydney Thayer was last updated on April 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.