NPPES file of Aug 9, 2026

Marilyn Harter, ARNP

Nurse Practitioner · Marshalltown, IA

Marilyn Harter, ARNP is a nurse practitioner with a practice address in Marshalltown, Iowa, and NPI 1124401922, issued on Jun 30, 2015. Check the license (Iowa A097804, as entered in NPPES) with the Iowa board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1124401922
Name
Marilyn Harter
Credential
ARNP
Primary taxonomy
Nurse Practitioner 363L00000X
License number
A097804 IA
Self-reported in NPPES; status is on the state search
Practice location
412 E Church St, Marshalltown, IA 50158
Phone
(641) 753-4021
Enumerated
Jun 30, 2015
Record last updated
Dec 21, 2025
Fax
(641) 753-4025
Medicare enrollment
Enrolled (PECOS I20160303000046); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest nurse practitioner records → All 1,294 in Iowa → Look up another NPI →

Also registered at 412 E Church St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Claudia Beckwith, N.P.Nurse Practitioner1548318272
  2. Victoria Campbell, NP-CFamily Nurse Practitioner1497179014
  3. Cindy Cruikshank, N.P.Women's Health Nurse Practitioner1104974849
  4. Katherine Eaton, ARNPNurse Practitioner1265504138
  5. Karisa Goering, PA-CPhysician Assistant1073941498
  6. Lea Husak, N.P.Women's Health Nurse Practitioner1649328279

Verify Marilyn Harter in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Iowa board licenses this profession
    Search for license A097804    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Iowa license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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55% fewer Medicare Part D claims than the average nurse practitioner in 2024

503 Medicare Part D claims for 323 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D.

  1. Marilyn Harter503
  2. Specialty average1,109

Most prescribed

  1. Prednisone79 claims
  2. Cephalexin46 claims
  3. Nitrofurantoin Mono-Macro41 claims
  4. Doxycycline Hyclate38 claims
  5. Azithromycin33 claims
  6. Amoxicillin-Clavulanate Potass31 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.

Industry payments in 2024: $83.56

1 payment: food and beverage; the largest payer was Novo Nordisk 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.

  1. Marilyn Harter$83.56
  2. Specialty average$791.64

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

3 hospitals and group practices

  1. Broadlawns Medical CenterDes Moines, IA · Acute Care Hospitals3 of 5 stars
  2. Mercy Clinics IncDes Moines, IA
  3. Mercyone UrgentcareClinton, IA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

Marilyn Harter among 1,294 nurse practitioner records in Iowa

Marilyn Harter, ARNP is one of 1,294 nurse practitioner records with a practice address in Iowa. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 44% of them.

  • NPI issued2015 · 44% of these records are older, 53% newer
  • In a Medicare fileYes · 79% of these records are
  • In the CMS Doctors and Clinicians fileYes · 68% of these records are
  • Graduated2015 · median 2018 among the 873 with a school on file
  • Record last updated2025 · 46% 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 Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

15 nurse practitioner records list a practice address in Marshalltown

They are 15 of the 443 NPPES records with a practice address in Marshalltown, and 1,294 nurse practitioner records in Iowa.

All 1,294 in Iowa → Every provider in Marshalltown → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Shannon Appel, ARNPMarshalltown, IA 501581447737143
  2. Carol Barlow, ARNPMarshalltown, IA 501581225592074
  3. Claudia Beckwith, N.P.Marshalltown, IA 501581548318272
  4. Margaret Duffy, ARNPMarshalltown, IA 501581841293503
  5. Katherine Eaton, ARNPMarshalltown, IA 501581265504138
  6. Ann Ersland, ARNPMarshalltown, IA 501581407477714
  7. Taylor FrizzellMarshalltown, IA 501581790565331
  8. Maggie Hansen, ARNPMarshalltown, IA 501581508670886

Common questions

What is Marilyn Harter, ARNP's NPI number?

Marilyn Harter, ARNP's National Provider Identifier (NPI) is 1124401922, issued on Jun 30, 2015. An NPI identifies a provider in billing; it is not a license.

Where is Marilyn Harter, ARNP located?

The NPPES record lists a practice address at 412 E Church St, Marshalltown, IA, 50158. Phone: (641) 753-4021. Providers update this record themselves, so call before visiting.

How can I verify Marilyn Harter, ARNP's license?

NPPES lists Iowa license number A097804, as entered by the provider. Search the Iowa board that licenses this profession; the NPPES record confirms identity only.

How much does Marilyn Harter, ARNP prescribe under Medicare Part D?

In 2024, Marilyn Harter, ARNP had 503 Medicare Part D claims for 323 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.

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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.