NPPES file of Aug 9, 2026

Internal Medicine Physician in Illinois

7,238 NPPES records list internal medicine physician with a practice address in Illinois, 58 per 100,000 residents, the 9th highest rate of 51. Chicago and Maywood have the most; each record links to the provider's NPI and the Illinois license search. Page 92 of 145.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207R00000X · 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, 2,867

  1. Chicago2,867
  2. Maywood257
  3. Springfield196
  4. Evanston178
  5. Oak Lawn173

Internal Medicine Physician records in Illinois

  1. Maria Obreja, MDChicago, IL 606401780363614
  2. Daniel Obrien, D.O.Peoria, IL 616371134578479
  3. Elizabeth Obrien, M.D.Carlinville, IL 626261881650570
  4. Matthew Obrien, MDChicago, IL 606111306900378
  5. Judith Obrien-Heyworth, M.D.Chicago, IL 606161912913989
  6. Sean Oconnor, M.D.Chicago, IL 606111609831528
  7. Agata Oczko-Danguilan, M.D.Grayslake, IL 600301285701714
  8. Ameer OdehChicago, IL 606111215635594
  9. Yaseen Odeh, M.D.Chicago, IL 606221457447443
  10. Amy Odgers, M.D.Chicago, IL 606471649463316
  11. Paul Odland, M.D.Chicago, IL 606141760596464
  12. Samuel Odoi, MDChicago, IL 606121366286411
  13. Peter OdonnellChicago, IL 606371861695819
  14. Amir Oduche, MDSpringfield, IL 627041497372361
  15. Ugonna Ogbenna, DO, MPHChicago, IL 606121497509244
  16. Chiagoziem OgbonnaChicago, IL 606111093574402
  17. Ikponmwosa Ogieuhi, M.DMcHenry, IL 600501962296301
  18. Donna Oh, DOOak Lawn, IL 604531326894791
  19. Eugene Oh, MDChicago, IL 606111326986548
  20. John Oh, M.D.Niles, IL 607141992730725
  21. Kyong Oh, M.D.Niles, IL 607141144253048
  22. Sandy Oh, MDArlington Heights, IL 600041851325203
  23. Youjin OhChicago, IL 606121336822733
  24. Pius Ojemolon, MDChicago, IL 606121114599354
  25. Garima Ojha, MBBSChicago, IL 606121790617025
  26. Yudai Okabe, MDChicago, IL 606121699522342
  27. Doris Okafor, M.D.Romeoville, IL 604461659512945
  28. Lawrence Okafor, M.D.South Holland, IL 604731285649012
  29. Reginald Okagbue, MDChicago, IL 606391235309352
  30. Solomon Okai, M.D.Oak Park, IL 603021992815088
  31. Daniel Okamoto, M.D.Chicago, IL 606121073803979
  32. Ahmed Okba, MDMoline, IL 612651538139100
  33. Busala Oke, MDSkokie, IL 600761205478799
  34. Emmanuel Okematti, MDChicago, IL 606111942902184
  35. Nelson OkobiaUrbana, IL 618011003699109
  36. Chiedu Okonmah, DOOak Lawn, IL 604531255130076
  37. Obiefuna Okponyia, MDCarbondale, IL 629011609505528
  38. Onoja-Frederick Okwori, MDUrbana, IL 618011235875725
  39. Ayobami Olafimihan, MDChicago, IL 606121013661628
  40. Bartholomew Olash, MDChicago, IL 606121164164299
  41. Todd Oldham, M.D.Schaumburg, IL 601731205195856
  42. Lisa Oldson, M.D.Skokie, IL 600771588694707
  43. Uchenna Olekanma, M.D.Chicago, IL 606201356309421
  44. Prakash Oli, MDChicago, IL 606081831934207
  45. Annette Olin, MDLong Grove, IL 600471053323881
  46. Teresa Olivares, M.D.Lemont, IL 604391700057015
  47. Alan Olivas Gastelum, DOChicago, IL 606121134964430
  48. Desiree Oliveros, MDElgin, IL 601231205846128
  49. Omar Oliveros, M.D.Chicago, IL 606391538542337
  50. Daniel Olivieri, MDChicago, IL 606371528708815

Source: CMS NPPES, primary taxonomy 207R00000X: records by practice city and the list of records, file of Aug 9, 2026.

Illinois ranks 9 of 51 per resident

  1. Hawaii63
  2. New York62
  3. Delaware58
  4. Illinois58
  5. Michigan57
  6. Pennsylvania56
  7. 50 states and D.C.44

Source: CMS NPPES, primary taxonomy 207R00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

72.5% of these records appear in a Medicare file, against 78.7% 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. Illinois72.5%
  2. United States78.7%

Internal Medicine Physician records in Illinois, measured

  • In a Medicare file5,251 of 7,238 · 72.5% here, 78.7% nationally
  • In the CMS Doctors and Clinicians file3,584 · 49.5% here, 61.4% nationally
  • Not updated in five years or more3,434 · 47.4% here, 55.4% nationally
  • Median graduation year2003 · the 3,580 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207R00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

7,238 NPPES records list internal medicine physician (207R00000X) as their primary taxonomy with a practice address in Illinois: 58 per 100,000 residents against 44 nationally (50 states and D.C.). Chicago has 2,867 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. Pennsylvania7,300
  2. Massachusetts6,825
  3. Michigan5,735
  4. Texas9,175

States with a similar rate per 100,000

  1. Delaware58.1
  2. New York61.7
  3. Hawaii62.9
  4. Maryland63.2

The largest states

  1. California17,696
  2. New York12,067
  3. Florida10,151
  4. Texas9,175
  5. Pennsylvania7,300

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.