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 139 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. Kimberly Webb, MDChicago, IL 606521831160944
  2. David Wechter, M.D.Chicago, IL 606161659486348
  3. Claudia Weddaburne, MDElmwood Park, IL 607071912920265
  4. Heidi Wehlus, M.D.Buffalo Grove, IL 600891912163130
  5. Dapeng Wei, M.D.Hinsdale, IL 605211467407023
  6. Brian WeilandChicago, IL 606261225597529
  7. Carol Weinberg, MDNaperville, IL 605401538128517
  8. Jeffrey Weinberg, M.D.Skokie, IL 600761447228762
  9. Josh Weinberg, MDChicago, IL 606371336884824
  10. Lawrence Weiner, M.D.Niles, IL 607141508816901
  11. Rebecca Weiner, DOEvanston, IL 602011215382742
  12. Claire WeinsteinChicago, IL 606111497515522
  13. David Weinstein, MDEvanston, IL 602011669118501
  14. Karen Weinstein, MDOak Park, IL 603021790732048
  15. Terrie Weir, MDRiver Forest, IL 603051831148808
  16. Holly Weis, M.D.Park Ridge, IL 600681568751352
  17. Diane Weis Bontke, MDSpringfield, IL 627021487765483
  18. Mark WeisbergElk Grove Vlg, IL 600071972531168
  19. Alan Weiss, M.D.Elk Grove Village, IL 600071366594194
  20. David Weiss, MDMorton Grove, IL 600531851431068
  21. Debbie Weiss, MDFox River Grove, IL 600211962707117
  22. Glenn Weiss, MDNormal, IL 617901306807730
  23. Gretchen Weiss, MDChicago, IL 606021528049491
  24. Kevin Weiss, M.D.Chicago, IL 606141255423315
  25. Raymond Weiss, M.D.Chicago Ridge, IL 604151528005634
  26. Shana Weiss, MDLibertyville, IL 600481932149945
  27. Janet Welch, M.D.Champaign, IL 618221891898110
  28. Genet WeldemichaelBerwyn, IL 604021679318877
  29. Charles Welford, MDRockford, IL 611071972586857
  30. Herschel Weller, MDGlenview, IL 600261528126893
  31. James Wells, D.O.Breese, IL 622301992717185
  32. Frank Wen, MD, PHDChicago, IL 606371316511678
  33. Lindsay Werkmeister, M.D.Chicago, IL 606311467847962
  34. William Werner, M.D., M.P.H.Chicago, IL 606571073596904
  35. Frank Weschler, M.D.Glenview, IL 600261114099173
  36. Richard Wesly, MDSpringfield, IL 627021952227910
  37. Siobhan West, MDChicago, IL 606371295595890
  38. Thomas Westerhoff, M. D.Quincy, IL 623011598706871
  39. Mary Westerholm, M.D.Winfield, IL 601901790951093
  40. Renee Westley, M.D.Skokie, IL 600761376869891
  41. Pamela Wetzel, MDRockford, IL 611141366530602
  42. George Weyer, M.D.Burr Ridge, IL 605271295047553
  43. James Whalen, M. D.Rockford, IL 611081194809947
  44. Brandon Wheatley, MD, MPHChicago, IL 606371710541206
  45. Eleanore Whelan, DNPChicago, IL 606241275037319
  46. Eric Whitaker, M.D.Chicago, IL 606371740440395
  47. Brian WhiteMaywood, IL 601531942760715
  48. Brittany White, MDChicago, IL 606121467287516
  49. Evelyn White, MDKildeer, IL 600471699855924
  50. James White, M.D.Springfield, IL 627041861589103

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.