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 100 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. M. Jane Perrin, M.D.Chicago, IL 606121760412407
  2. Angela Perry, M.D.South Holland, IL 604731164970141
  3. Stephen Persell, MDChicago, IL 606111831124585
  4. Victoria Persky, M.D.Chicago, IL 606571558603159
  5. Chithra Perumalswami, M.D.Chicago, IL 606111053433524
  6. Amar Peruri, MDLake Forest, IL 600451184726499
  7. Ashwini Peruri, M.D.Park Ridge, IL 600681700107711
  8. Elene PestvenidzeEvanston, IL 602021124901996
  9. Olusoji Peter, M.D.Chicago, IL 606281225018203
  10. Kevin Petermann, M.D.Oak Lawn, IL 604531588744650
  11. Claudia Petersen, MDGlenview, IL 600261629189501
  12. John Peterson, PHD, MDMoline, IL 612651760452189
  13. John Peterson, M.D.Champaign, IL 618221003833625
  14. Mark Peterson, MDOswego, IL 605431114030384
  15. Sanjay Pethkar, M.D.Plainfield, IL 605851134181829
  16. Thitapa Petlerkwong, DOPeoria, IL 616371285372193
  17. Katarina PetrasMaywood, IL 601531043638570
  18. Elliot Petropoulos, MDChicago, IL 606161225655665
  19. Peter Petropulos, MDChicago, IL 606371619404969
  20. Demetrios Petrovas, MDChicago, IL 606341871547505
  21. Kathryn Petrungaro, M.D.Northbrook, IL 600621558526186
  22. Yuliana Petryshyn, MDMcHenry, IL 600501700536562
  23. Carl Pett, MDChicago, IL 606121639792179
  24. Carl Pfaehler, MDBerwyn, IL 604021245024397
  25. Anthony Pham, MDChicago, IL 606081093452112
  26. Suzanne Pham, M.D.Melrose Park, IL 601601659537298
  27. Trinh Pham, MDChicago, IL 606121710331962
  28. Hoangmai Phan, M.DChicago, IL 606111194869842
  29. Peter Phelan, MDRockford, IL 611141548358534
  30. Shannon Philander, M.D.Chicago, IL 606571699208348
  31. Anil Philip, MDChicago, IL 606121982597605
  32. Mathew Philip, M.D.Wheaton, IL 601871124282082
  33. Sheetal Philip, M.D.Hoffman Estates, IL 601691669750659
  34. Benjamin Phillips, MDCanton, IL 615201275678021
  35. Valesia Phillips, MDChicago, IL 606161225080625
  36. Richard Phillis, MDMilan, IL 612641548446800
  37. Susan Piazza, MDGlenview, IL 600261467473132
  38. Maurice Pickard, MAURICE PICKARDHighland Park, IL 600351942566641
  39. Paul Pickering, M.D.Chicago, IL 606191407973183
  40. Katherine Pickett, MDNaperville, IL 605631740258581
  41. Raymundo Picos, MDChicago, IL 606111275240566
  42. David Pielykh, MDBerwyn, IL 604021073369286
  43. Warren Pierce, MDHoffman Estates, IL 601691235125535
  44. Krzysztof Pierko, M.D.Chicago, IL 606121750696175
  45. Marlise Pierre-Wright, MDChicago, IL 606111437632866
  46. Danielle Pierro, M.D.Chicago, IL 606111417981812
  47. Janice Pierson, M.D.Palos Heights, IL 604631255329546
  48. Stephen Pierson, MDWheaton, IL 601871518935360
  49. Lynn Piest, MDHighland Park, IL 600351801853072
  50. John PietrykowskiChicago, IL 606111699424234

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.