Alexa Jo Duling Williams, MD
Obstetrics & Gynecology Physician · O Fallon, MO
Alexa Jo Duling Williams, MD is an obstetrics & gynecology physician with a practice address in O Fallon, Missouri, and NPI 1972033652, issued on Jun 15, 2017. Check the license (Missouri 2021013439, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Alexa Jo Duling Williams
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License numbers
- 2021013439 MO
2017019537 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1101 Highway K, O Fallon, MO 63366
- Phone
- (636) 379-6363
- Enumerated
- Jun 15, 2017
- Record last updated
- Nov 10, 2025
- Medicare enrollment
- Enrolled (PECOS I20210811002105); accepts Medicare assignment
- Medical or professional school
- University Of Arizona College Of Medicine, 2017
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 902 in Missouri → Look up another NPI →
Also registered at 1101 Highway K
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tanvira Alam, DOObstetrics & Gynecology Physician1265670525
- Samantha Branson, FNPFamily Nurse Practitioner1386186732
- Riley Busch, PA-CPhysician Assistant1013775238
- Christine Cortadillo, D.O.Obstetrics & Gynecology Physician1417186099
- Courtney Croy, PT, DPTPhysical Therapist1952055022
- Lindsay Dickerhoff, M.D.Obstetrics & Gynecology Physician1790028520
Verify Alexa Jo Duling Williams 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 2021013439Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
66 Medicare Part D claims for 30 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Metronidazole13 claims
- Estradiol11 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: $81.64
5 payments; by number, the most common kind was food and beverage; the largest payer was Astellas Pharma US Inc. 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 2 group practices
- Mercy Clinic East CommunitiesSaint Louis, MO
- Ssm Medical Group IncO Fallon, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alexa Jo Duling Williams among 902 obstetrics & gynecology physician records in Missouri
Alexa Jo Duling Williams, MD 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 2017, is newer than 75% of them.
- NPI issued2017 · 75% of these records are older, 22% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2017 · median 2007 among the 528 with a school on file
- Record last updated2025 · 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 Alexa Jo Duling Williams, MD's NPI number?
Alexa Jo Duling Williams, MD's National Provider Identifier (NPI) is 1972033652, issued on Jun 15, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Alexa Jo Duling Williams, MD located?
The NPPES record lists a practice address at 1101 Highway K, O Fallon, MO, 63366. Phone: (636) 379-6363. Providers update this record themselves, so call before visiting.
How can I verify Alexa Jo Duling Williams, MD's license?
NPPES lists Missouri license number 2021013439, 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 Alexa Jo Duling Williams, MD prescribe under Medicare Part D?
In 2024, Alexa Jo Duling Williams, MD had 66 Medicare Part D claims for 30 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.