Mary Withoelter, NURSE PRACTITIONER
Nurse Practitioner · O Fallon, MO
Mary Withoelter, NURSE PRACTITIONER is a nurse practitioner with a practice address in O Fallon, Missouri, and NPI 1982188389, issued on Sep 20, 2018. Check the license (Missouri 2019033706, as entered in NPPES) with the Missouri board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Withoelter
- Credential
- NURSE PRACTITIONER
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- 2019033706 MO
Self-reported in NPPES; status is on the state search - Practice location
- 2630 State Highway K, O Fallon, MO 63368
- Phone
- (636) 980-5300
- Enumerated
- Sep 20, 2018
- Record last updated
- Sep 18, 2025
- Fax
- (636) 980-5344
- Medicare enrollment
- Enrolled (PECOS I20200316000939); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 1,720 in Missouri → Look up another NPI →
Also registered at 2630 State Highway K
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Rachel Harris, NPNurse Practitioner1225499866
- Beverly Schneider, FNP-BCNurse Practitioner1306112388
- George Stachecki, M.D.Family Medicine Physician1902916927
Verify Mary Withoelter in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Missouri board licenses this profession
Search for license 2019033706Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average nurse practitioner in 2024
373 Medicare Part D claims for 217 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone101 claims
- Doxycycline Monohydrate39 claims
- Azithromycin26 claims
- Cephalexin25 claims
- Albuterol Sulfate Hfa23 claims
- Amoxicillin-Clavulanate Potass18 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 54.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $428.61
4 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 38,884 providers of this specialty with any payment received $791.64 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
- Physician Groups LCSaint Louis, MO
- Total Access Urgent Care PCSaint Louis, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Withoelter among 1,720 nurse practitioner records in Missouri
Mary Withoelter, NURSE PRACTITIONER is one of 1,720 nurse practitioner records with a practice address in Missouri. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 57% of them.
- NPI issued2018 · 57% of these records are older, 36% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2018 · median 2017 among the 1,080 with a school on file
- Record last updated2025 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
36 nurse practitioner records list a practice address in O Fallon
They are 36 of the 1,225 NPPES records with a practice address in O Fallon, and 1,720 nurse practitioner records in Missouri.
All 1,720 in Missouri → Every provider in O Fallon → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Kimberly Bonvillain, FNP-CO Fallon, MO 633681649561788
- Kimberly Burgess, FNPO Fallon, MO 633681356536288
- Katherine Clancy, FNPO Fallon, MO 633681568724284
- Melissa Godar, FNPO Fallon, MO 633681912383274
- Rachel Harris, NPO Fallon, MO 633681225499866
- Christine Lovellette, FNPO Fallon, MO 633681437336617
- Jennifer Phillips, APRN-CO Fallon, MO 633681700301272
- Kelly Schelich, APRN, FNP-CO Fallon, MO 633681427539030
Common questions
What is Mary Withoelter, NURSE PRACTITIONER's NPI number?
Mary Withoelter, NURSE PRACTITIONER's National Provider Identifier (NPI) is 1982188389, issued on Sep 20, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Mary Withoelter, NURSE PRACTITIONER located?
The NPPES record lists a practice address at 2630 State Highway K, O Fallon, MO, 63368. Phone: (636) 980-5300. Providers update this record themselves, so call before visiting.
How can I verify Mary Withoelter, NURSE PRACTITIONER's license?
NPPES lists Missouri license number 2019033706, as entered by the provider. Search the Missouri board that licenses this profession; the NPPES record confirms identity only.
How much does Mary Withoelter, NURSE PRACTITIONER prescribe under Medicare Part D?
In 2024, Mary Withoelter, NURSE PRACTITIONER had 373 Medicare Part D claims for 217 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.
What is Mary Withoelter, NURSE PRACTITIONER's MIPS final score?
The 2023 MIPS final score is 54.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.