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Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

ANDREA DARCY O'RIORDAN
NPI 1861325425
Obstetrics & Gynecology in Saint Louis, MO

Active since June 04, 2026PECOS Enrolled
4901 FOREST PARK AVE STE 710, SAINT LOUIS, MO 63108(314) 362-4211 Get Directions Write a Review

NPPES record added: June 12, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Andrea Darcy O'riordan NPPES

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

ANDREA DARCY O'RIORDAN (NPI 1861325425) is an individual obstetrics & gynecology provider in Saint Louis, Missouri, licensed in Missouri (2026026802) and active in the NPI registry since June 2026. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1861325425
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameANDREA DARCY O'RIORDAN
Location Address4901 FOREST PARK AVE STE 710Saint Louis, MO 63108-1495
Mailing Address4901 Forest Park Ave Ste 710Saint Louis, MO 63108-1495
Phone(314) 362-4211
Sole ProprietorNo
Enumeration DateJune 4, 2026
Last NPPES UpdateJune 12, 2026
NPPES CertifiedJune 12, 2026
✔ NPI 1861325425 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in MO · 2026026802
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.
4901 FOREST PARK AVE STE 710, Saint Louis, MO 63108
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Andrea Darcy O'riordan is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

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 9

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

HANNAH WAVERING-WALTERS
Obstetrics & Gynecology
4901 FOREST PARK AVE STE 710
SAINT LOUIS, MO 63108
St. Louis City (314) 747-1402
DR. NAAZANENE MARYAM VATAN MD
Obstetrics & Gynecology
4901 FOREST PARK AVE STE 710
SAINT LOUIS, MO 63108
St. Louis City (314) 362-7135
DR. GEORGE A MACONES MD
Obstetrics & Gynecology (Maternal & Fetal Medicine)
4901 FOREST PARK AVE STE 710, STE 710
SAINT LOUIS, MO 63108
St. Louis City (314) 454-8181
DR. DIANE F MERRITT MD
Obstetrics & Gynecology (Gynecology)
4901 FOREST PARK AVE STE 710, STE 710
SAINT LOUIS, MO 63108
St. Louis City (314) 273-4724
MORGAN ROSE WILT TIMM MD, PHD
Student in an Organized Health Care Education/Training Program
4901 FOREST PARK AVE STE 710
SAINT LOUIS, MO 63108
St. Louis City (314) 362-4211
DR. ERIN K JOHNSON MD
Obstetrics & Gynecology
4901 FOREST PARK AVE STE 710
SAINT LOUIS, MO 63108
St. Louis City (206) 834-4100
DR. ALISON GALE CAHILL MD
Obstetrics & Gynecology (Maternal & Fetal Medicine)
4901 FOREST PARK AVE STE 710, STE 710
SAINT LOUIS, MO 63108
St. Louis City (314) 454-8181
DR. DONALD M NELSON MD
Obstetrics & Gynecology (Maternal & Fetal Medicine)
4901 FOREST PARK AVE STE 710, STE 710
SAINT LOUIS, MO 63108
St. Louis City (314) 454-8181

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 Andrea O'riordan's NPI number?

The NPI number for Andrea O'riordan is 1861325425. It was assigned to this individual provider in the NPPES registry on June 4, 2026.

Where is Andrea O'riordan located?

Andrea O'riordan practices at 4901 Forest Park Ave Ste 710, Saint Louis, MO 63108. The listed phone number is (314) 362-4211.

What is Andrea O'riordan's specialty?

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

Is Andrea O'riordan enrolled in Medicare?

Yes. Andrea O'riordan is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Andrea O'riordan was last updated on June 12, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.