Doctor profile · Federal record

Dr. Margaretta Mendenhall, M.D.

Obstetrics & Gynecology Physician (CMS: Obstetrics/Gynecology) · O Fallon, MO

  • NPI 1275730111
  • Accepts Medicare
  • 19 yrs in practice
  • Female
  • Group practice
  • No sanctions

Practice & contact

NPPES Updated May 11, 2026
Primary practice
300 Winding Woods Dr, Suite 200
O Fallon, MO 633664771
(636) 240-0130
fax (636) 240-6822
Mailing address
21 Roclare Ln
Saint Louis, MO 631311100

Credentials & registration

NPPES · NUCC
NPI registered
July 2007 — 19 yrs on file
Profile last updated
March 11, 2014
Year of graduation
2007 — 19 yrs since
Specialty taxonomy
207V00000X — NUCC code
State license (1)
Missouri #2011009917

Federal sanctions & exclusions

OIG LEIE Updated May 11, 2026

No sanctions, exclusions or revocations on file

Checked against OIG LEIE on NPI 1275730111. Last verified May 11, 2026.

Medicare procedures · 2023

Top services delivered

CMS Provider Utilization
Total services
13
Distinct HCPCS
1
Medicare allowed
$505
HCPCS Description Services Patients Avg allowed
G0101 Cervical or vaginal cancer screening; pelvic and clinical breast examination 13 13 $39

In context: peer comparison

Among 5 peers in O Fallon Obstetrics & Gynecology Physician, average services per provider: 28. This provider delivers 0.5× the peer median.

Open Payments

Industry payments received

CMS Open Payments
All-time total
$114
Transactions
6
Manufacturers
6
Payer (manufacturer) Industry Txns Amount
Organon LLC 1 $24.57
Astellas Pharma US INC 1 $22.20
Sumitomo Pharma America, INC. 1 $20.23
Evofem Biosciences, INC. 1 $17.40
Bayer Healthcare Pharmaceuticals INC. 1 $16.26
CooperSurgical, INC. 1 $13.16

By nature of payment

Food and Beverage
$114

Medicare Part D · 2023

Top prescriptions

CMS Part D Prescriber
Total claims
43
Patients
0
Total drug cost
$8,676
Drug Type Claims Patients Total cost
Estradiol Generic 19 0 $1,506
Medroxyprogesterone Acetate Generic 12 0 $401
Premarin (Estrogens, Conjugated) Brand 12 0 $6,769

Hospital affiliations

CMS Hospital Compare

Frequently asked questions

Auto-generated from federal data
What is Dr. Margaretta Mendenhall's medical specialty?
Dr. Margaretta Mendenhall practices Obstetrics & Gynecology Physician in O Fallon, MO.
Where does Dr. Margaretta Mendenhall practice?
Dr. Margaretta Mendenhall practices at 300 Winding Woods Dr, O Fallon, MO 633664771. Office phone: 6362400130.
What is Dr. Margaretta Mendenhall's NPI?
Dr. Margaretta Mendenhall's National Provider Identifier (NPI) is 1275730111, issued by NPPES.
Does Dr. Margaretta Mendenhall accept Medicare assignment?
Yes. Dr. Margaretta Mendenhall accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Margaretta Mendenhall commonly perform?
Top Medicare-reported procedures in 2023: Cervical or vaginal cancer screening; pelvic and clinical breast examination (HCPCS G0101). Source: CMS Medicare Physician & Other Practitioners file.