NPPES file of Aug 9, 2026

Diana Isela Diaz, FNP-C

Family Nurse Practitioner · Elmhurst, IL

Diana Isela Diaz, FNP-C is a family nurse practitioner with a practice address in Elmhurst, Illinois, and NPI 1184514960, issued on Jul 3, 2025. Check the license (Illinois 209-031925, 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 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1184514960
Name
Diana Isela Diaz
Credential
FNP-C
Primary taxonomy
Family Nurse Practitioner 363LF0000X
License number
209-031925 IL
Self-reported in NPPES; status is on the state search
Practice location
207 E Butterfield RD, Elmhurst, IL 60126
Phone
(630) 359-8054
Enumerated
Jul 3, 2025
Record last updated
Jul 3, 2025
Medicare enrollment
Enrolled (PECOS I20250821004176); 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 family nurse practitioner records → All 7,639 in Illinois → Look up another NPI →

Also registered at 207 E Butterfield RD

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

  1. Aneta Magiera, MSN, APRN, FNP-CFamily Nurse Practitioner1457173742
  2. Iryna Petriv, FNP-BCFamily Nurse Practitioner1154195071

Verify Diana Isela Diaz 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 209-031925    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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Bills Medicare through one group practice

  1. Midwest Express Care 2, IncWillowbrook, IL

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

Diana Isela Diaz among 7,639 family nurse practitioner records in Illinois

Diana Isela Diaz, FNP-C is one of 7,639 family nurse practitioner records with a practice address in Illinois. 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 2025, is newer than 91% of them.

  • NPI issued2025 · 91% of these records are older, 3% newer
  • In a Medicare fileYes · 78% of these records are
  • In the CMS Doctors and Clinicians fileYes · 63% of these records are
  • Graduated2024 · median 2018 among the 4,778 with a school on file
  • Record last updated2025 · 39% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

32 family nurse practitioner records list a practice address in Elmhurst

They are 32 of the 1,540 NPPES records with a practice address in Elmhurst, and 7,639 family nurse practitioner records in Illinois.

All 7,639 in Illinois → Every provider in Elmhurst → Family Nurse Practitioner nationwide →

The 8 family nurse practitioner records with the nearest ZIP codes

  1. Lisa Biancalana-Marsh, DNP, APN, FNP-BCElmhurst, IL 601261396134623
  2. Mary Bradley, APRNElmhurst, IL 601261568494318
  3. Renata Ciszek, APNElmhurst, IL 601261447567268
  4. Edgardo Galvez, NP-CElmhurst, IL 601261952718355
  5. Marion Kolar, MSN, RN, FNP-BCElmhurst, IL 601261184997843
  6. Christine Koutsky, NPElmhurst, IL 601261841626694
  7. Lyana Kubilius, APNElmhurst, IL 601261518164433
  8. Tammy Laas, APNElmhurst, IL 601261720331473

Common questions

What is Diana Isela Diaz, FNP-C's NPI number?

Diana Isela Diaz, FNP-C's National Provider Identifier (NPI) is 1184514960, issued on Jul 3, 2025. An NPI identifies a provider in billing; it is not a license.

Where is Diana Isela Diaz, FNP-C located?

The NPPES record lists a practice address at 207 E Butterfield RD, Elmhurst, IL, 60126. Phone: (630) 359-8054. Providers update this record themselves, so call before visiting.

How can I verify Diana Isela Diaz, FNP-C's license?

NPPES lists Illinois license number 209-031925, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity 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.