NPPES file of Aug 9, 2026

Emergency Medicine Physician in Illinois

3,291 NPPES records list emergency medicine physician with a practice address in Illinois, 26 per 100,000 residents, the 8th highest rate of 51. Chicago and Oak Lawn have the most; each record links to the provider's NPI and the Illinois license search. Page 44 of 66.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207P00000X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Chicago has the most, 1,310

  1. Chicago1,310
  2. Oak Lawn163
  3. Peoria138
  4. Springfield126
  5. Evanston98

Emergency Medicine Physician records in Illinois

  1. Deborah O'Brien, M.D.Montgomery, IL 605381780778779
  2. Thomas O'Brien, MDUrbana, IL 618011326577792
  3. Patricia O'Connell, MDChicago, IL 606111851895668
  4. Harry O'Gorman, MDOak Lawn, IL 604531801599071
  5. Brandon O'Malley, MDChicago, IL 606311174180715
  6. Michael O'Mara, D.O.Evergreen Park, IL 608051366426710
  7. Carolyn O'Neill, DOChicago, IL 606311972252484
  8. Allison Oberst, MDChicago, IL 606311174187926
  9. Nicholas Oblock, MDChicago, IL 606121730684663
  10. Jose OcampoChicago, IL 606611245526144
  11. Jose Ochoa, MDUrbana, IL 618011134454630
  12. Marie Oconnor Parker, MDLemont, IL 604391528035789
  13. Randhirji Odedra, M.D.Woodstock, IL 600981962613885
  14. Danilo Ofreneo, M.D.Springfield, IL 627691669497913
  15. Joseph Ogarek, M.D.Park Ridge, IL 600681982843918
  16. Emmanuel OgeleChicago, IL 606111669865374
  17. Eugene Oh, M.D.Lisle, IL 605321508851858
  18. Thomas Oh, M.D.Naperville, IL 605401033275276
  19. Ashray Ohri, M.D.Chicago, IL 606311639551716
  20. Christopher Oie, M.D.Geneva, IL 601341770666414
  21. Udoka Oji, MDChicago, IL 606371588303242
  22. Maryam Ojulari, MDOak Park, IL 603021457091456
  23. Brandon Okeke, MDChicago, IL 606371336992544
  24. Elif Oker, M.D.Chicago, IL 606051629294467
  25. Linda Okra-BoatengPeoria, IL 616361790063139
  26. Oyinkansola Okubanjo, M.D.Oak Lawn, IL 604531669854667
  27. Afolayan Oladeji, MDChicago, IL 606111356090823
  28. Paul Oland, DODekalb, IL 601151598867236
  29. Paula Oldeg, M.D.Chicago, IL 606121568438687
  30. Michael Oleksiak, M.D.Elgin, IL 601231114367778
  31. Kayla Olesky, D.O.Peoria, IL 616371548794753
  32. Tanner Olinger, DOChicago, IL 606311710636360
  33. Amy Oliver, MDChicago, IL 606311790934669
  34. Kevin Oliver, DODecatur, IL 625211477549020
  35. Gregory Olmsted, M.D.Chicago Heights, IL 604111245597210
  36. Jon OlsenPark Ridge, IL 600681083783930
  37. Michael Olsen, M.D.Peoria, IL 616371144423526
  38. Adriana OlsonChicago, IL 606371891016754
  39. Brent Olson, DOUrbana, IL 618011053998633
  40. Nathan OlsonChicago, IL 606371972824779
  41. Ekiomoado Olumese, MDChicago, IL 606371871283531
  42. Hamzeh OmarElgin, IL 601231760001564
  43. Price Omondi, D.O.Decatur, IL 625211477504488
  44. Kamatchi Ondiveerappan, MDMount Carmel, IL 628631003893959
  45. Mark Oquist-Cardenas, MDLibertyville, IL 600481306208103
  46. Fernando Orellana, M.D.Chicago, IL 606081548260623
  47. Elizabeth OrsayChicago, IL 606121467551564
  48. Luciano Orta, MDMcHenry, IL 600501346353505
  49. Andrew Ortega, M.D.Peoria, IL 616371467808402
  50. Pilar Ortega, M.D.Chicago, IL 606371487923652

Source: CMS NPPES, primary taxonomy 207P00000X: records by practice city and the list of records, file of Aug 9, 2026.

Illinois ranks 8 of 51 per resident

  1. Vermont30
  2. Pennsylvania30
  3. West Virginia28
  4. Illinois26
  5. Massachusetts26
  6. Hawaii26
  7. 50 states and D.C.21

Source: CMS NPPES, primary taxonomy 207P00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

80.2% of these records appear in a Medicare file, against 81.5% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. Illinois80.2%
  2. United States81.5%

Emergency Medicine Physician records in Illinois, measured

  • In a Medicare file2,638 of 3,291 · 80.2% here, 81.5% nationally
  • In the CMS Doctors and Clinicians file1,867 · 56.7% here, 58.7% nationally
  • Not updated in five years or more1,549 · 47.1% here, 54.8% nationally
  • Median graduation year2012 · the 1,867 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207P00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

3,291 NPPES records list emergency medicine physician (207P00000X) as their primary taxonomy with a practice address in Illinois: 26 per 100,000 residents against 21 nationally (50 states and D.C.). Chicago has 1,310 of them (40%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. Michigan3,083
  2. Ohio3,002
  3. Pennsylvania3,911
  4. Florida4,034

States with a similar rate per 100,000

  1. Massachusetts26.1
  2. Hawaii25.8
  3. New York25.7
  4. Oregon25.5

The largest states

  1. California7,751
  2. New York5,025
  3. Texas4,885
  4. Florida4,034
  5. Pennsylvania3,911

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

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.