NPPES file of Aug 9, 2026

Merle John Denker, M.D.

Orthopaedic Surgery Physician · Geneva, IL

Merle John Denker, M.D. is an orthopaedic surgery physician with a practice address in Geneva, Illinois, and NPI 1023211679, issued on Jun 8, 2007. Check the license on the Illinois Department of Financial and Professional Regulation; the federal record below is the public data PlainDoctor holds for this provider.

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

NPPES recordNPPES file of Aug 9, 2026
1023211679
Name
Merle John Denker
Credential
M.D.
Primary taxonomy
Orthopaedic Surgery Physician 207X00000X
Practice location
2525 Kaneville RD, Geneva, IL 60134
Phone
(630) 584-1400
Enumerated
Jun 8, 2007
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(630) 584-1733
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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8 nearest orthopaedic surgery physician records → All 995 in Illinois → Look up another NPI →

Also registered at 2525 Kaneville RD

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

  1. Bashir Ahmed, MDAnesthesiology Physician1164447108
  2. Brett Albert, DPMFoot & Ankle Surgery Podiatrist1770103483
  3. Thomas Atkins, M.D.Orthopaedic Hand Surgery Physician1467423145
  4. Eric Bartel, M.D.Orthopaedic Surgery Physician1851371264
  5. Michael Bianco, MPTPhysical Therapist1588641799
  6. Jennifer BolanderPhysician Assistant1942271655

Verify Merle John Denker in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck 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
Open the Illinois license search

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Merle John Denker among 995 orthopaedic surgery physician records in Illinois

Merle John Denker, M.D. is one of 995 orthopaedic surgery physician records with a practice address in Illinois. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 51% of them.

  • NPI issued2007 · 51% of these records are older, 43% newer
  • In a Medicare fileNo · 77% of these records are
  • In the CMS Doctors and Clinicians fileNo · 56% of these records are
  • Record last updated2007 · 51% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Orthopaedic Surgery Physician providers in Illinois

There are 995 orthopaedic surgery physician records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 995 in Illinois → Every provider in Geneva → Orthopaedic Surgery Physician nationwide →

The 8 orthopaedic surgery physician records with the nearest ZIP codes

  1. Eric Bartel, M.D.Geneva, IL 601341851371264
  2. David Morawski, M.D.Geneva, IL 601341215917257
  3. Jasper Petrucci, M.D.Geneva, IL 601341659342343
  4. Rodney Rieger, M.D.Geneva, IL 601341962482984
  5. Marc Asselmeier, M.D.Glen Ellyn, IL 601371245217272
  6. Eugene Bartucci, MDElmhurst, IL 601261932213469
  7. Christos Giannoulias, M.D./M.S.Elmhurst, IL 601261336198357
  8. William Hadesman, MDElmhurst, IL 601261548284003

Common questions

What is Merle John Denker, M.D.'s NPI number?

Merle John Denker, M.D.'s National Provider Identifier (NPI) is 1023211679, issued on Jun 8, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Merle John Denker, M.D. located?

The NPPES record lists a practice address at 2525 Kaneville RD, Geneva, IL, 60134. Phone: (630) 584-1400. Providers update this record themselves, so call before visiting.

How can I verify Merle John Denker, M.D.'s license?

Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.