Margaretta Lynn Mendenhall, M.D.
Obstetrics & Gynecology Physician · O Fallon, MO
Margaretta Lynn Mendenhall, M.D. is an obstetrics & gynecology physician with a practice address in O Fallon, Missouri, and NPI 1275730111, issued on Jul 2, 2007. Check the license (Missouri 2011009917, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Margaretta Lynn Mendenhall
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 2011009917 MO
Self-reported in NPPES; status is on the state search - Practice location
- 300 Winding Woods Dr, O Fallon, MO 63366
- Phone
- (636) 240-0130
- Enumerated
- Jul 2, 2007
- Record last updated
- Mar 11, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (636) 240-6822
- Medicare enrollment
- Enrolled (PECOS I20111006000313); accepts Medicare assignment
- Medical or professional school
- Saint Louis University School Of Medicine, 2007
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 902 in Missouri → Look up another NPI →
Also registered at 300 Winding Woods Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Louis Gaefke, DPMPodiatrist1629148648
- Leah Glass, D.O.Obstetrics & Gynecology Physician1093942997
- Alyssa Keller, M.D.Family Medicine Physician1588892665
- Sondra McClanahan, FNPFamily Nurse Practitioner1487747879
- Julie Stewart, DPMFoot & Ankle Surgery Podiatrist1124165428
Verify Margaretta Lynn Mendenhall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2011009917Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
14% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
142 Medicare Part D claims for 48 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Estradiol26 claims
- Premarin14 claims
- Clobetasol Propionate13 claims
- Medroxyprogesterone Acetate11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $113.82
6 payments; by number, the most common kind was food and beverage; the largest payer was Organon Llc. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Mercy Clinic East CommunitiesBallwin, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaretta Lynn Mendenhall among 902 obstetrics & gynecology physician records in Missouri
Margaretta Lynn Mendenhall, M.D. is one of 902 obstetrics & gynecology physician records with a practice address in Missouri. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 46% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2007 · median 2007 among the 528 with a school on file
- Record last updated2014 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
20 obstetrics & gynecology physician records list a practice address in O Fallon
They are 20 of the 1,225 NPPES records with a practice address in O Fallon, and 902 obstetrics & gynecology physician records in Missouri.
All 902 in Missouri → Every provider in O Fallon → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Tanvira Alam, DOO Fallon, MO 633661265670525
- Lauren Buchanan, MDO Fallon, MO 633661467946160
- Christine Cortadillo, D.O.O Fallon, MO 633661417186099
- Lindsay Dickerhoff, M.D.O Fallon, MO 633661790028520
- Emma Eubanks, MDO Fallon, MO 633661326484742
- Leah Glass, D.O.O Fallon, MO 633661093942997
- Danielle Grunloh-Gumpenberger, MDO Fallon, MO 633661285164053
- Katherine Harkess, M.D.O Fallon, MO 633661295116143
Common questions
What is Margaretta Lynn Mendenhall, M.D.'s NPI number?
Margaretta Lynn Mendenhall, M.D.'s National Provider Identifier (NPI) is 1275730111, issued on Jul 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Margaretta Lynn Mendenhall, M.D. located?
The NPPES record lists a practice address at 300 Winding Woods Dr, O Fallon, MO, 63366. Phone: (636) 240-0130. Providers update this record themselves, so call before visiting.
How can I verify Margaretta Lynn Mendenhall, M.D.'s license?
NPPES lists Missouri license number 2011009917, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Margaretta Lynn Mendenhall, M.D. prescribe under Medicare Part D?
In 2024, Margaretta Lynn Mendenhall, M.D. had 142 Medicare Part D claims for 48 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.