MRS. MICHELLE MARIE KOESTER WHNP
NPI 1881962843
Nurse Practitioner in Saint Peters, MO

Q: What is Michelle Koester's NPI number?

The NPI number for Michelle Koester is 1881962843. It was assigned to this individual provider in the NPPES registry on December 6, 2011.

Q: What is Michelle Koester's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Q: When was this NPI record last updated?

The NPPES record for Michelle Koester was last updated on January 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months 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 December 06, 2011PECOS EnrolledAccepts Medicare Assignment

201 BJC SAINT PETERS DR STE 200, SAINT PETERS, MO 63376(636) 916-9615(636) 916-9850 Get Directions Write a Review

NPPES record last updated: January 29, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jan 29, 2026, Apr 25, 2024, Apr 10, 2024 and 4 more (7 updates tracked since 2016).

On this page

About Mrs. Michelle Marie Koester Whnp NPPES

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

MRS. MICHELLE MARIE KOESTER WHNP (NPI 1881962843) is an individual nurse practitioner in Saint Peters, Missouri, licensed in Missouri (2000147926) and active in the NPI registry since December 2011. She is enrolled in Medicare PECOS, is affiliated with Mercy Hospital South, and maintains a secondary practice location in Saint Louis.

NPPES Registry Identity

NPI1881962843

Entity TypeIndividualFemale

Primary Taxonomy363L00000X

Provider Legal NameMRS. MICHELLE MARIE KOESTERCredential: WHNP

Location Address201 BJC SAINT PETERS DR STE 200Saint Peters, MO 63376-3386

Mailing AddressPo Box 959354Saint Louis, MO 63195-9354 · (636) 916-9615 · Fax (636) 916-9850

Phone(636) 916-9615

Fax(636) 916-9850

Sole ProprietorNo

Medical School CMSOtherGraduated 2011

Enumeration DateDecember 6, 2011

Last NPPES UpdateJanuary 29, 20267 updates tracked since enumeration

NPPES CertifiedJanuary 29, 2026

✔ NPI 1881962843 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363L00000X

License✔ Licensed in MO · 2000147926

Definition

(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.

Also ListedNurse Practitioner · Women's HealthTaxonomy 363LW0102X · License 2011038536 (MO)

201 BJC SAINT PETERS DR STE 200, Saint Peters, MO 63376

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Secondary Practice Location 1

Location 14901 Forest Park Ave, Dept OBGYN, Ste 341Saint Louis, MO 63108-1495 · Phone (314) 454-7882 · Fax (314) 454-5167

Other Identifiers 1

Medicaid420012381MO

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Medica.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mrs. Michelle Marie Koester Whnp 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 ID2567607641

PECOS Enrollment IDI20130320000191

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.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Mercy Hospital South

Acute Care Hospitals · Saint Louis, MO

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260077

Location10010 Kennerly RoadSaint Louis, MO 63128 · St. Louis County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63376 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

$86.32 typical visit price

range $55.65 – $169.38

Typical copayment $21.58 (range $13.91 – $42.34)

Most-billed visit code 99203

Established Patient

$98.37 typical visit price

range $17.76 – $137.92

Typical copayment $24.59 (range $4.44 – $34.48)

Most-billed visit code 99214

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

Other Providers at the Same Location NPPES 19

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. XIMENA SOLEDAD SCHNURR M.D.

Family Medicine