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 7 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. Ashley FranklinBehavior Technician1235785650
  2. Anthony FreemanStudent in an Organized Health Care Education/Training Program1598612566
  3. Amy FreyPharmacist1023610870
  4. Megan FreyOccupational Therapist1225895709
  5. Paige FrickBehavior Analyst1770108912
  6. Vicki Fricke, PHD, RBTBehavior Technician1063058071
  7. Alec FriedmanStudent in an Organized Health Care Education/Training Program1760292650
  8. John Frisbie, MAMHProfessional Counselor1639588478
  9. Kylie FritzBehavior Technician1598473647
  10. Courtney FryOccupational Therapy Assistant1912719790
  11. Brittni FutrellOccupational Therapist1972161065
  12. Maria GalanosEmergency Medicine Physician1073609814
  13. Aristides Garces, M.D.Family Medicine Physician1679672273
  14. Maria GarciaBehavior Technician1598340408
  15. Candice GastonBehavior Technician1659952687
  16. Gladsy George, DMDDentist1215627153
  17. Alyssa GersteneckerBehavior Technician1922723428
  18. Ashley GerstnerSpeech-Language Pathologist1851723035
  19. Rugheed Ghadban, MDClinical Cardiac Electrophysiology Physician1255644191
  20. Ashley GibsonBehavior Technician1942814272
  21. Brittany Gilbreth, D.M.DDentist1285049825
  22. John GillPhysical Therapist1770908782
  23. Stephanie Gillette, BEHAVIOR TECHNICIANBehavior Technician1114878709
  24. Angela Giron BonillaBehavior Technician1982598868
  25. Barbara GlotfeltyRegistered Nurse1326478975
  26. Alexandria Gomez, PHARMDPharmacist1043104359
  27. Audrey Gonzalez, LCPCProfessional Counselor1437610086
  28. Malcolm Goodwin, M. D.Cytopathology Physician1437228194
  29. Kamron Gopffarth, DOStudent in an Organized Health Care Education/Training Program1770436875
  30. Bryon Gorton, M.D.Specialist1366500910
  31. Raghav Govindarajan, MDNeuromuscular Medicine (Psychiatry & Neurology) Physician1639481914
  32. Catherin GrahamBehavior Technician1962115766
  33. Victoria GravotBehavior Technician1144928425
  34. Lindsey GraySpeech-Language Pathologist1164210167
  35. Kendra Green, FNP-CFamily Nurse Practitioner1952849770
  36. Kristinna GreenBehavior Technician1811665987
  37. Wesley Green, MDOphthalmology Physician1851736037
  38. Avis GregoryBehavior Technician1407588106
  39. Richard Greiff, DDSGeneral Practice Dentistry1134135270
  40. Sydney Griffin, M.S. CF-SLPSpeech-Language Pathologist1073329694
  41. Annamaria Griffith, DNP, FNP-CFamily Nurse Practitioner1023786456
  42. Bridget Grissom, PTPhysical Therapist1043395015
  43. Jenna GrissomBehavior Technician1538808761
  44. Joel GrovesHealth Information Technician1366151896
  45. Bryan Guignon, DPMPodiatrist1831551555
  46. Kort GuilletteStudent in an Organized Health Care Education/Training Program1407647506
  47. Cindy Gullo, L.C.P.CProfessional Counselor1750720512
  48. Pavan Gupta, MDCardiovascular Disease Physician1861519563
  49. Marianne GuthrieNurse Practitioner1609313758
  50. Marjorie Guthrie, M.D.Family Medicine Physician1366490146

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.