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 121 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. John Sia, MDLincolnwood, IL 607121912958281
  2. George Sianis, MDChicago, IL 606251255366191
  3. Hailey Sibbett, D.O.Batavia, IL 605101306226246
  4. Mikail SiddikiChicago, IL 606371265061063
  5. Mohammed Siddique, M.D.Lake Forest, IL 600451659683951
  6. Harris Siddiqui, MDNormal, IL 617611801389119
  7. Irfan Siddiqui, MDOak Lawn, IL 604531023404795
  8. Mahrukh Siddiqui, MDChicago, IL 606571205316908
  9. Mohammad Siddiqui, MDSkokie, IL 600761487630513
  10. Mohammed SiddiquiOakbrook Terrace, IL 601811275917957
  11. Nadia Siddiqui, M.D.Orland Park, IL 604621801052659
  12. Osama SiddiquiEvanston, IL 602011225512270
  13. Saba Siddiqui, M.D.Long Grove, IL 600471225370836
  14. Sara SiddiquiChicago, IL 606111558086769
  15. Sarah Siddiqui, D.O.La Grange Highlands, IL 605251982847026
  16. Shahnaz SiddiquiChicago, IL 606121154827038
  17. Suhail Siddiqui, M.D.Chicago, IL 606591316904279
  18. Solomon SideaChicago, IL 606251003924507
  19. Dilraj Sidhu, M.D.Grayslake, IL 600301811953722
  20. Kamaldeep Sidhu, D.O.Chicago, IL 606251710720388
  21. G Sidler, MDMorton, IL 615501396844932
  22. Stanley Sidwell, MDAlton, IL 620021073529475
  23. Dannie Sieben, MDPark Ridge, IL 600681831993054
  24. Richard Siebert, M.D.Lake Forest, IL 600451205985157
  25. Leonard Siedband, M.D.Niles, IL 607141992754840
  26. Michael SiegelChicago, IL 606121962089698
  27. Mark SieglerChicago, IL 606371407919913
  28. Janet Siel, MDGlenview, IL 600261093873366
  29. John Sifuentes, M.D.Joliet, IL 604331154433621
  30. Melissa Sifuentes, M.D.Chicago, IL 606121396194569
  31. Fernando Sigala, MDChicago, IL 606121881440949
  32. Ranjit Sigamony, M.DOak Forest, IL 604521023184983
  33. Shushil Sigdel, MDChicago, IL 606401366015075
  34. Martin Siglin, M.D.Chicago, IL 606401487719852
  35. Scott Siglin, M.D.Chicago, IL 606371497060982
  36. Paramjit Sikand, M.D.Joliet, IL 604361902875628
  37. Vaibhavi Silamgari, DOChicago, IL 606401306474424
  38. Karl Silge, MDChicago, IL 606121386872612
  39. Irene Silva, MDChicago, IL 606541114910692
  40. Sebastian SilvaChicago, IL 606141679155857
  41. Yomaira Silva, MDChicago, IL 606371609516095
  42. Cathleen Silverman, M.D.Chicago, IL 606161730560301
  43. Hannah SilvermanChicago, IL 606121487237608
  44. Christine Simaytis, M.D.Rockford, IL 611081629176060
  45. Aditi SimloteChicago, IL 606111063971067
  46. James Simmering, MDMaryville, IL 620621700973351
  47. Elizabeth Simon, MDWaukegan, IL 600851942217153
  48. Gerald Simon, MDCountryside, IL 605251861450330
  49. Stanley Simon, MDFranklin Park, IL 601311942321336
  50. Predrag Simovic, MDChicago, IL 606571811074503

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.