NPPES file of Aug 9, 2026

Doctors and health care providers in O Fallon, IL

1,077 individual NPPES records list a practice address in O Fallon, 44th of 541 Illinois cities. The largest group is behavior technician: 295, 27% of the city's records, against 4% across Illinois. Page 13 of 22.

CMS NPPES registry, file of Aug 9, 2026 · method · Verify with CMS →

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

The 8 largest groups in O Fallon

  1. Behavior Technician295
  2. Speech-Language Pathologist67
  3. Family Medicine Physician44
  4. Students in training43
  5. Behavior Analyst43
  6. Chiropractor35
  7. Family Nurse Practitioner32
  8. Pharmacist31

Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.

O Fallon in Illinois

  • Rank in Illinois44th of 541 cities by records
  • Share of the state0.4% of Illinois's records
  • Specialties present25 or more taxonomy codes
  • Top three groups37.7% of all records
  • Behavior Technician rank4th of the 10 Illinois cities with the most

Compared with Illinois as a whole, O Fallon has 7× the state's share of behavior technician records and 0.25× its share of mental health counselor records.

Providers in O Fallon, alphabetically

  1. Bailey McDonaldSpeech-Language Pathologist1912540345
  2. Krista McDonald, LSWClinical Social Worker1245615426
  3. Lynita McDougald, RBTBehavior Technician1356084008
  4. Aideen McEnaney, ODOptometrist1770343246
  5. Rodnica McGee, BTBehavior Technician1194476432
  6. Michael McGuire, PA-C, ATCPhysician Assistant1164931960
  7. Casey McHaneyBehavior Analyst1679038954
  8. Gina McKee, MS, MA, LCPCProfessional Counselor1174847693
  9. Katie McKelvy-Gibbons, MA, LCPCProfessional Counselor1629668165
  10. Ashleigh McKinleyBehavior Technician1730847088
  11. Erin McLaughlinSpeech-Language Pathologist1699647354
  12. Lauren McLaughlin, ATCBehavior Technician1154949568
  13. Stefanie McLaughlinHealth Educator1639816358
  14. Angela McMillian, CRNACertified Registered Nurse Anesthetist1851849129
  15. Bradley McMillinHearing Instrument Specialist1629270400
  16. Abigail McPhersonPhysical Therapist1841173648
  17. Michelle McQuillan, DNP, FNP-BCNurse Practitioner1013533819
  18. Bailey Meadows, BEHAVIOR TECHNICIANBehavior Technician1821704578
  19. Zachary Medema, M.S.Speech-Language Pathologist1124343181
  20. Stephen MedfordAttendant Care Provider1104437797
  21. Nitika Mehta, D.D.S.General Practice Dentistry1982717559
  22. Gerusa Mello-Anderson, D.D.S.Pediatric Dentistry1790871721
  23. Rai'Annah MendezBehavior Technician1720959380
  24. Jeannette Mendoza-MartinezClinical Social Worker1417671025
  25. Myah MenseBehavior Technician1659231025
  26. Shannon Mensing, PHARMDPharmacist1649871823
  27. Taylor Merritt, LPHAMental Health Counselor1740959287
  28. Haley MertenBehavior Technician1992526842
  29. Emily Meyer, DCChiropractor1710633466
  30. Stephanie Milam, MDStudent in an Organized Health Care Education/Training Program1891257481
  31. Alison Miller, APNFamily Nurse Practitioner1700314945
  32. Kelsey Miller, MS SLPSpeech-Language Pathologist1558859025
  33. Kristine MillerHealth Educator1144957259
  34. Sheri Miller, MS, LMFT, LCPCMarriage & Family Therapist1841256419
  35. Rachel Minelli, PH.D.Clinical Psychologist1780086496
  36. Sara Minnick, D.C.Chiropractor1912368697
  37. Armand Miranda, D.O.Emergency Medicine Physician1780618074
  38. Savannah MisseyOccupational Therapy Assistant1497698336
  39. Angela Mitchell, LCPCCounselor1942585047
  40. Robert MitchellDriver1922313758
  41. Robyn MitchellBehavior Technician1821893389
  42. Mukaia Mitchom Lockett, D.C.Chiropractor1588712624
  43. Grace ModglinOccupational Therapist1457149791
  44. Rebecca Molitor, LCPCPsychologist1245311430
  45. Madeline Moll, CF-SLPSpeech-Language Pathologist1194619361
  46. Michelle MonkenHome Health Aide1588230635
  47. Victoria MonkenPersonal Care Attendant1407424559
  48. Alexis MontgomeryBehavior Technician1942138318
  49. Christina Moore, P.A.Physician Assistant1558738237
  50. Christopher Moore, HISHearing Instrument Specialist1306105978

The largest Illinois cities

  1. Chicago63,379
  2. Springfield4,997
  3. Naperville4,634
  4. Peoria4,621
  5. Evanston4,013

All of Illinois →

How to read this directory

O Fallon, Illinois appears in the CMS National Plan and Provider Enumeration System with 1,077 registered healthcare providers spanning 25 or more distinct NUCC-taxonomy specialties. This count includes every individual clinician who has applied for an NPI and listed a practice address in O Fallon - physicians, dentists, nurse practitioners, physician assistants, chiropractors, physical therapists, optometrists, psychologists, podiatrists, and every other credentialed provider type CMS tracks. It does not measure hospital beds, urgent-care capacity, or whether a given clinic is accepting new patients; it measures the pool of professionals with current NPI enrollment and a O Fallon practice location on file. Every figure is drawn from the federal National Provider Identifier Registry (CMS NPPES) - more than 7 million providers, maintained since May 2007, with 2024 Medicare Part D data, and, according to CMS, can be searched, compared, and traced in our methodology.

The provider mix in O Fallon is weighted toward Behavior Technician (295 clinicians, followed by Speech-Language Pathologist with 67 and Family Medicine Physician with 44). That distribution reflects how NPPES records specialty: providers self-select a primary taxonomy code, so a family physician who also practices geriatrics will show up under whichever NUCC code they registered first. Relative to Illinois's population, O Fallon reports roughly 8.6 providers per 100,000 residents using the state-level denominator, which is a rough proxy rather than a precise access-to-care measurement; the true catchment area of any {cityName} clinician extends beyond the municipal boundary.

Of Illinois's most common specialties, Internal Medicine Physician is the most prominent one with no provider currently listing a O Fallon practice address, a coverage gap O Fallon patients typically fill by traveling to a larger nearby hub.

For O Fallon patients, this directory is most useful as a starting shortlist. Important: PlainDoctor is a directory of publicly available CMS government data, not a review site, a ranking, or medical advice. NPPES data is self-reported and refreshed monthly; call the practice directly to confirm the provider is still there, accepts your insurance, and is taking new patients.

For informational purposes only; this directory is not medical advice and not a substitute for checking a license. See also: how to find a doctor and how to verify one.

Common questions

How many doctors are in O Fallon, IL?

There are 1,077 registered healthcare providers in O Fallon, IL, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in O Fallon?

The most common specialties in O Fallon are Behavior Technician, Speech-Language Pathologist, Family Medicine Physician, Student in an Organized Health Care Education/Training Program, Behavior Analyst. Behavior Technician has the most providers with 295.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov). Records are self-reported registrations, not licenses.

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.