NPPES file of Aug 9, 2026

Karen Bretz, APN

Family Nurse Practitioner · Chicago, IL

Karen Bretz, APN is a family nurse practitioner with a practice address in Chicago, Illinois, and NPI 1134428683, issued on Mar 23, 2011. Check the license (Illinois 209.008406, 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
1134428683
Name
Karen Bretz
Credential
APN
Primary taxonomy
Family Nurse Practitioner 363LF0000X
License numbers
209.008406 IL
15230-33 WI
Self-reported in NPPES; status is on the state search
Practice location
5625 N Ridge Ave, Chicago, IL 60660
Phone
(800) 323-8622
Enumerated
Mar 23, 2011
Record last updated
Oct 14, 2024
Fax
(847) 519-3652
Medicaid ID
100286348 WI
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 5625 N Ridge Ave

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

  1. Jonathan Ancheta, PHARMDPharmacist1184904831
  2. Senada BabicPharmacist1295018992
  3. Sonja JovanovichFamily Nurse Practitioner1194146258
  4. Deborah Kang, PHARMDPharmacist1043590623
  5. Michael Montelongo, PHARMD, RPHPharmacist1144984774
  6. Joel Ohrlund, PHARMDPharmacist1922497981

Verify Karen Bretz 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 209.008406    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

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93% fewer Medicare Part D claims than the average family nurse practitioner in 2024

86 Medicare Part D claims for 76 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.

  1. Karen Bretz86
  2. Specialty average1,305

Most prescribed

  1. Nitrofurantoin Mono-Macro30 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.

1,567 family nurse practitioner records list a practice address in Chicago

They are 1,567 of the 63,379 NPPES records with a practice address in Chicago, and 7,639 family nurse practitioner records in Illinois.

All 1,567 in Chicago → All 7,639 in Illinois → Every provider in Chicago →

Other family nurse practitioner records in Illinois

  1. Crystal Aandahl, FNPNorth Chicago, IL1316497068
  2. Deborah Aaron, FNPChicago, IL1114024916
  3. Roseviminda Abano, CNPGurnee, IL1215318555
  4. Theresa AbbaduskyPekin, IL1265892046
  5. Nadia Abbasi-Kling, FNP-BCChicago, IL1033767736
  6. Manar Abdalla, FNPChicago, IL1700632411
  7. Mahubah Abdallah, FNP-CRochelle, IL1841752284
  8. Rana Abdallah, DNP, APRN, FNP-CLake Villa, IL1851261887
  9. Servet Abdelhafez, APRNBrookfield, IL1790505048
  10. Nadia Abdessalam, FNP-BCOak Lawn, IL1356888283

Common questions

What is Karen Bretz, APN's NPI number?

Karen Bretz, APN's National Provider Identifier (NPI) is 1134428683, issued on Mar 23, 2011. An NPI identifies a provider in billing; it is not a license.

Where is Karen Bretz, APN located?

The NPPES record lists a practice address at 5625 N Ridge Ave, Chicago, IL, 60660. Phone: (800) 323-8622. Providers update this record themselves, so call before visiting.

How can I verify Karen Bretz, APN's license?

NPPES lists Illinois license number 209.008406, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.

How much does Karen Bretz, APN prescribe under Medicare Part D?

In 2024, Karen Bretz, APN had 86 Medicare Part D claims for 76 beneficiaries; the average among family nurse practitioner prescribers was 1,305. 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.