NPPES file of Aug 9, 2026

Katherine Masterton, APRN, CNP

Nurse Practitioner · Warrenville, IL

Katherine Masterton, APRN, CNP is a nurse practitioner with a practice address in Warrenville, Illinois, and NPI 1891433785, issued on May 22, 2022. Check the license (Illinois 209024984, as entered in NPPES) with the Illinois 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
1891433785
Name
Katherine Masterton
Credential
APRN, CNP
Primary taxonomy
Nurse Practitioner 363L00000X
License number
209024984 IL
Self-reported in NPPES; status is on the state search
Practice location
4405 Weaver Pkwy, Warrenville, IL 60555
Phone
(630) 352-5450
Enumerated
May 22, 2022
Record last updated
Feb 5, 2025
Fax
(630) 352-5499
Medicare enrollment
Enrolled (PECOS I20220628001394); accepts Medicare assignment
Medical or professional school
Rush Medical College Of Rush University, 2021
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 4,892 in Illinois → Look up another NPI →

Also registered at 4405 Weaver Pkwy

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

  1. John Abad, M.D.Surgical Oncology Physician1578722336
  2. Raanan Alter, MDGynecologic Oncology Physician1558789826
  3. John Ayers, MDHematology & Oncology Physician1477540821
  4. Madeline BiceNurse Practitioner1982189221
  5. Mackenzie Blackburn, APRN, CNPNurse Practitioner1740005511
  6. Robin Buerki, MDNeurology Physician1881936326

Verify Katherine Masterton in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Illinois board licenses this profession
    Search for license 209024984    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 Illinois 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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14% fewer Medicare Part D claims than the average nurse practitioner in 2024

949 Medicare Part D claims for 240 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. 75 claims were for opioids.

  1. Katherine Masterton949
  2. Specialty average1,109

Most prescribed

  1. Prednisone71 claims
  2. Xarelto70 claims
  3. Anastrozole69 claims
  4. Revlimid64 claims
  5. Dexamethasone60 claims
  6. Hydrocodone-Acetaminophen42 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: $371.21

13 payments; by number, the most common kind was food and beverage; the largest payer was Mirati Therapeutics, 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. Katherine Masterton$371.21
  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.

Bills Medicare through one group practice

  1. Northwestern Medical Faculty FoundationBloomingdale, IL

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Katherine Masterton among 4,892 nurse practitioner records in Illinois

Katherine Masterton, APRN, CNP is one of 4,892 nurse practitioner records with a practice address in Illinois. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 73% of them.

  • NPI issued2022 · 73% of these records are older, 20% newer
  • In a Medicare fileYes · 81% of these records are
  • In the CMS Doctors and Clinicians fileYes · 69% of these records are
  • Graduated2021 · median 2018 among the 3,389 with a school on file
  • Record last updated2025 · 36% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

22 nurse practitioner records list a practice address in Warrenville

They are 22 of the 517 NPPES records with a practice address in Warrenville, and 4,892 nurse practitioner records in Illinois.

All 4,892 in Illinois → Every provider in Warrenville → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Madeline BiceWarrenville, IL 605551982189221
  2. Tonia Cabai, NP-CWarrenville, IL 605551245684018
  3. Marjorie Delaney, NPWarrenville, IL 605551649354069
  4. Brittany GraftWarrenville, IL 605551205373461
  5. Angela Gryzbek, M.S.N.Warrenville, IL 605551144616327
  6. Sherry Henricks, APN-CNPWarrenville, IL 605551841422623
  7. Sarah Knobbe, FNP-BCWarrenville, IL 605551578032546
  8. Mary Kay Larson, APNWarrenville, IL 605551124293691

Common questions

What is Katherine Masterton, APRN, CNP's NPI number?

Katherine Masterton, APRN, CNP's National Provider Identifier (NPI) is 1891433785, issued on May 22, 2022. An NPI identifies a provider in billing; it is not a license.

Where is Katherine Masterton, APRN, CNP located?

The NPPES record lists a practice address at 4405 Weaver Pkwy, Warrenville, IL, 60555. Phone: (630) 352-5450. Providers update this record themselves, so call before visiting.

How can I verify Katherine Masterton, APRN, CNP's license?

NPPES lists Illinois license number 209024984, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.

How much does Katherine Masterton, APRN, CNP prescribe under Medicare Part D?

In 2024, Katherine Masterton, APRN, CNP had 949 Medicare Part D claims for 240 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.