Jennifer Castle, ARNP
Clinical Nurse Specialist · Mason City, IA
Jennifer Castle, ARNP is a clinical nurse specialist with a practice address in Mason City, Iowa, and NPI 1871031302, issued on Feb 3, 2017. Check the license (Iowa W107452, as entered in NPPES) with the Iowa board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Jennifer Castle
- Credential
- ARNP
- Primary taxonomy
- Clinical Nurse Specialist 364S00000X
- License number
- W107452 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1000 4TH St SW, Mason City, IA 50401
- Phone
- (641) 428-6300
- Enumerated
- Feb 3, 2017
- Record last updated
- Jul 15, 2025
- Fax
- (641) 428-6347
- Medicare enrollment
- Enrolled (PECOS I20170406003026); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
5 nearest clinical nurse specialist records → All 6 in Iowa → Look up another NPI →
Also registered at 1000 4TH St SW
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jennifer Castle in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Iowa board licenses this profession
Search for license W107452Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% more Medicare Part D claims than the average clinical nurse specialist in 2024
1,065 Medicare Part D claims for 247 beneficiaries, against an average of 957 among the 361 providers of this specialty who prescribed in Part D. Brand-name drugs were 2% of claims.
Most prescribed
- Anastrozole379 claims
- Letrozole261 claims
- Tamoxifen Citrate117 claims
- Gabapentin63 claims
- Exemestane42 claims
- Alendronate Sodium40 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: $206.42
7 payments; by number, the most common kind was food and beverage; the largest payer was Sanofi-Aventis U.S. LLC. The 457 providers of this specialty with any payment received $871.23 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 one group practice
- North Iowa Mercy ClinicsMason City, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clinical Nurse Specialist providers in Iowa
There are 6 clinical nurse specialist records in Iowa.
All 6 in Iowa → Every provider in Mason City → Clinical Nurse Specialist nationwide →
The 5 clinical nurse specialist records with the nearest ZIP codes
- Emily Vore, MSN, RN, AGCNS-BCDes Moines, IA 503091548078355
- Kacie GarverBoone, IA 500361063263630
- Lisa Ducommun, CNPCherokee, IA 510121023105616
- Jeannie Franklin, PMHNPSioux City, IA 511011679813976
- Margaret Simons, ARNP, BC-ADM, CDEIowa City, IA 522461831132760
Common questions
What is Jennifer Castle, ARNP's NPI number?
Jennifer Castle, ARNP's National Provider Identifier (NPI) is 1871031302, issued on Feb 3, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Jennifer Castle, ARNP located?
The NPPES record lists a practice address at 1000 4TH St SW, Mason City, IA, 50401. Phone: (641) 428-6300. Providers update this record themselves, so call before visiting.
How can I verify Jennifer Castle, ARNP's license?
NPPES lists Iowa license number W107452, as entered by the provider. Search the Iowa board that licenses this profession; the NPPES record confirms identity only.
How much does Jennifer Castle, ARNP prescribe under Medicare Part D?
In 2024, Jennifer Castle, ARNP had 1,065 Medicare Part D claims for 247 beneficiaries; the average among clinical nurse specialist prescribers was 957. 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.
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.