Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Alexa Jo Duling Williams, MD

Individual provider Obstetrics & Gynecology Physician · NPI 1972033652

Alexa Jo Duling Williams, MD practises Obstetrics/Gynecology in O Fallon, Missouri. Graduated from University of Arizona College of Medicine in 2017, 9 years ago. Practices with SSM Medical Group Inc, a 560-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
9
Trained at
University of Arizona College of Medicine
Licensed in
MO
In the registry since
2017
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1101 Highway K
O Fallon, MO 63366-8431
Phone: (636) 379-6363
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 12700 Southfork Rd Ste 230, Saint Louis, MO 63128-3276 — (314) 849-3711
  • 615 S New Ballas Rd, Saint Louis, MO 63141-8221 — (314) 251-6062

Specialties & licences

Obstetrics & Gynecology Physician (primary) Taxonomy 207V00000X · Licence 2021013439 (MO)
Obstetrics & Gynecology Physician Taxonomy 207V00000X · Licence 2017019537 (MO)

Record details

NPI number1972033652
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 15, 2017
Last updated in NPPESNovember 10, 2025
Certification dateNovember 10, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolUNIVERSITY OF ARIZONA COLLEGE OF MEDICINE
Graduated 2017 (9 years in practice)
Group practice Ssm Medical Group Inc — 560 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients22
Services billed 34 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $18 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at SSM Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 560 clinicians in the practice; 12 are shown here.

Other providers in O Fallon