NPPES file of Aug 9, 2026

Harold B. Eulien

Internal Medicine Physician · Chicago, IL

Harold B. Eulien is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1700877222, issued on Nov 3, 2005. 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
1700877222
Name
Harold B. Eulien
Primary taxonomy
Internal Medicine Physician 207R00000X
Practice location
2800 N Sheridan RD, Chicago, IL 60657
Phone
(773) 525-4740
Enumerated
Nov 3, 2005
Record last updated
Jul 13, 2026
Fax
(773) 525-4022
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 internal medicine physician records → All 7,238 in Illinois → Look up another NPI →

Also registered at 2800 N Sheridan RD

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

  1. Mary Atha, NPNurse Practitioner1235229469
  2. Nasrin Azimzadeh, D.M.D.General Practice Dentistry1215070453
  3. Bruce Blacker, M.D.Internal Medicine Physician1982603924
  4. Stephen Bonzak, L.AC.Acupuncturist1205075264
  5. William Bradshaw, M.D.Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician1588637953
  6. Robert Breyer, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1992777445

Verify Harold B. Eulien 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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Harold B. Eulien among 7,238 internal medicine physician records in Illinois

Harold B. Eulien is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% 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 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 93% newer
  • In a Medicare fileNo · 73% of these records are
  • In the CMS Doctors and Clinicians fileNo · 50% of these records are
  • Record last updated2026 · 47% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

2,867 internal medicine physician records list a practice address in Chicago

They are 2,867 of the 63,379 NPPES records with a practice address in Chicago, and 7,238 internal medicine physician records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 7,238 in Illinois → Every provider in Chicago → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Bruce Blacker, M.D.Chicago, IL 606571982603924
  2. Brian Boholst, M.D.Chicago, IL 606571235181959
  3. Edgar Borda, MDChicago, IL 606571891782447
  4. Lisa Greising, M.D.Chicago, IL 606571578523155
  5. Michael Grendon, M.D.Chicago, IL 606571922007962
  6. Catherine Kallal, MDChicago, IL 606571407801665
  7. Alam Khan, M.D.Chicago, IL 606571316946288
  8. Thomas Klarquist, M.D.Chicago, IL 606571477517373

Common questions

What is Harold B. Eulien's NPI number?

Harold B. Eulien's National Provider Identifier (NPI) is 1700877222, issued on Nov 3, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Harold B. Eulien located?

The NPPES record lists a practice address at 2800 N Sheridan RD, Chicago, IL, 60657. Phone: (773) 525-4740. Providers update this record themselves, so call before visiting.

How can I verify Harold B. Eulien'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.