Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Katherine Seiler Harkess, MD

Individual provider Obstetrics & Gynecology Physician · NPI 1295116143

Dr. Katherine Seiler Harkess, MD practises Obstetrics/Gynecology in O Fallon, Missouri. Qualified in 2015, 11 years ago. Practices with Hh Physicians Network, a 108-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
11
Licensed in
MO
In the registry since
2015
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

300 Winding Woods Dr Ste 200
O Fallon, MO 63366
Phone: (636) 240-0130
Fax: (636) 240-6822
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 15945 Clayton Road Suite 305, Ballwin, MO 63011-8221 — (636) 256-5090
  • 615 S New Ballas Rd, Saint Louis, MO 63141-8221 — (314) 251-6062

Specialties & licences

Obstetrics & Gynecology Physician (primary) Taxonomy 207V00000X · Licence 2019026841 (MO)

Record details

NPI number1295116143
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 16, 2015
Last updated in NPPESMarch 25, 2020
Certification dateMarch 25, 2020

Medicare enrollment

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

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolOTHER
Graduated 2015 (11 years in practice)
Group practice Hh Physicians Network — 108 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients14
Services billed 22 a service is one billed item, such as a visit, a test or a procedure
Average patient age57

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 $35 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 Hh Physicians Network

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 108 clinicians in the practice; 12 are shown here.

Other providers in O Fallon