DR. KATHERINE SEILER HARKESS M.D.
NPI 1295116143
Obstetrics & Gynecology in O'fallon, MO

Q: What is Katherine Harkess's NPI number?

The NPI number for Katherine Harkess is 1295116143. It was assigned to this individual provider in the NPPES registry on June 16, 2015.

Q: What is Katherine Harkess's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Q: When was this NPI record last updated?

The NPPES record for Katherine Harkess was last updated on March 25, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since June 16, 2015PECOS EnrolledAccepts Medicare Assignment

300 WINDING WOODS DRIVE SUITE 200, O'FALLON, MO 63366(636) 240-0130(636) 240-6822 Get Directions Write a Review

NPPES record last updated: March 25, 2020. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Mar 25, 2020, Aug 1, 2019 (2 updates tracked since 2019).

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About Dr. Katherine Seiler Harkess M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. KATHERINE SEILER HARKESS M.D. (NPI 1295116143) is an individual obstetrics & gynecology provider in O'fallon, Missouri, licensed in Missouri (2019026841) and active in the NPI registry since June 2015. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2015).

NPPES Registry Identity

NPI1295116143

Entity TypeIndividualFemale

Primary Taxonomy207V00000X

Provider Legal NameDR. KATHERINE SEILER HARKESSCredential: M.D.

Location Address300 WINDING WOODS DRIVE SUITE 200O'fallon, MO 63366

Mailing Address300 Winding Woods Drive Suite 200O'fallon, MO 63366 · (636) 240-0130 · Fax (636) 240-6822

Phone(636) 240-0130

Fax(636) 240-6822

Sole ProprietorYes

Medical School CMSOtherGraduated 2015

Enumeration DateJune 16, 2015

Last NPPES UpdateMarch 25, 20202 updates tracked since enumeration

NPPES CertifiedMarch 25, 2020

✔ NPI 1295116143 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians

Taxonomy Code207V00000X

License✔ Licensed in MO · 2019026841

Definition

An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.

300 WINDING WOODS DRIVE SUITE 200, O'fallon, MO 63366

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Secondary Practice Locations 2

Location 1615 S New Ballas Rd, Ob/GynSaint Louis, MO 63141-8221 · Phone (314) 251-6062 · Fax (314) 251-4376

Location 215945 Clayton Road Suite 305Ballwin, MO 63011-8221 · Phone (636) 256-5090

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter of Alabama, Ambetter of Tennessee and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Katherine Seiler Harkess M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID547576449

PECOS Enrollment IDI20200827000803

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Katherine Harkess reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Women4women Obgyn, LLC

361 mi

Obstetrics & Gynecology

320 PELHAM AVENUE, SW, SUITE 300
Huntsville, AL 35801

Reassigned Medicare billing, Alabama enrollment
10 clinicians in this Medicare group

NPI 1902338163 (256) 675-9269

Emergency Physicians Group

361 mi

Emergency Medicine

101 SIVLEY RD SW, EM DEPT
Huntsville, AL 35801

Reassigned Medicare billing, Alabama enrollment
193 clinicians in this Medicare group

NPI 1659366649 (256) 265-9891

Hh Physicians Network

361 mi

Specialist

101 SIVLEY RD SW
Huntsville, AL 35801

Reassigned Medicare billing, Alabama enrollment
182 clinicians in this Medicare group

NPI 1891359683 (256) 801-6036

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63366 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$128.28 typical visit price

range $55.65 – $169.38

Typical copayment $32.07 (range $13.91 – $42.34)

Most-billed visit code 99204

Established Patient

$69.50 typical visit price

range $17.76 – $137.92

Typical copayment $17.37 (range $4.44 – $34.48)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Katherine Harkess's NPI number?

The NPI number for Katherine Harkess is 1295116143. It was assigned to this individual provider in the NPPES registry on June 16, 2015.

Where is Katherine Harkess located?

Katherine Harkess practices at 300 Winding Woods Drive Suite 200, O'fallon, MO 63366. The listed phone number is (636) 240-0130.

What is Katherine Harkess's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Katherine Harkess enrolled in Medicare?

Yes. Katherine Harkess is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Katherine Harkess's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Katherine Harkess reassigns Medicare benefits to 3 organizations: Women4women Obgyn, LLC (Huntsville, AL), Emergency Physicians Group (Huntsville, AL) and Hh Physicians Network (Huntsville, AL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Katherine Harkess's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Katherine Harkess accept?

Health plans from Ambetter Health, Ambetter of Alabama, Ambetter of Tennessee, Blue Cross and Blue Shield of Alabama and BlueCross BlueShield of Tennessee and 1 other insurer list Katherine Harkess as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Katherine Harkess was last updated on March 25, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.