NPPES file of Aug 9, 2026

Doctors and health care providers in O Fallon, MO

1,225 individual NPPES records list a practice address in O Fallon, 16th of 317 Missouri cities. The largest group is physical therapist: 131, 11% of the city's records, against 4% across Missouri. Page 4 of 25.

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. Physical Therapist131
  2. Speech-Language Pathologist119
  3. Pharmacist84
  4. Professional Counselor81
  5. Chiropractor74
  6. Family Nurse Practitioner44
  7. Clinical Social Worker40
  8. Family Medicine Physician37

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

O Fallon in Missouri

  • Rank in Missouri16th of 317 cities by records
  • Share of the state1.1% of Missouri's records
  • Specialties present25 or more taxonomy codes
  • Top three groups27.3% of all records
  • Physical Therapist rank3rd of the 10 Missouri cities with the most

Compared with Missouri as a whole, O Fallon has 6.3× the state's share of orthodontics and dentofacial orthopedics dentistry records and 0.59× its share of internal medicine physician records.

Providers in O Fallon, alphabetically

  1. Sara Busch, AGNP-CNurse Practitioner1669007100
  2. Cortney Buschmann, PHARMDPharmacist1336829779
  3. Leslie Butler, D.C.Chiropractor1033101936
  4. Jocelyn Butterfield, MA CCC SLPSpeech-Language Pathologist1154451011
  5. Kaluba BwalyaNurse's Aide1811750383
  6. Bess Cain, M.A., CCC-SLPSpeech-Language Pathologist1508903519
  7. Debra Call, MSPTPediatric Physical Therapist1760536742
  8. Aimee CalvinPhysical Therapist1942374608
  9. Acel Camfield, PAPhysician Assistant1982215471
  10. Vicki Campbell, PERINATAL HEALTHDoula1649102211
  11. John Canale, M.D.Psychiatry Physician1578569620
  12. Cassandra Cantu, DCChiropractor1154182004
  13. Kristen Cardascia, OTR/LOccupational Therapist1497481501
  14. Shannon Carlisle, PHARMDPharmacist1235677170
  15. Abraham Carpenter, D.C.Chiropractor1457678393
  16. Vivian Carr, LPCMental Health Counselor1598169120
  17. Amanda Carriker, M.A., L.P.CProfessional Counselor1497204036
  18. Baylie Carroll, DDSDentist1528707098
  19. Jennifer Carroll, BAStudent in an Organized Health Care Education/Training Program1568159820
  20. Megan CarrollAthletic Trainer1760965347
  21. Krista Carter, PA-CPhysician Assistant1043622277
  22. Sara Carter-Jameson, L.C.S.WClinical Social Worker1073063343
  23. Jamie Cassani, APRN, FNP-CFamily Nurse Practitioner1568864296
  24. Kent Alexander Cassmeyer, MDInternal Medicine Physician1417307505
  25. Lorenzo Catapang, DPTPhysical Therapist1013646546
  26. Tanya CatoOccupational Therapy Assistant1649042862
  27. Naomi CavanaghSpeech-Language Pathologist1427762343
  28. Emily CepickySpeech-Language Pathologist1760725311
  29. Tyler Cerutti, PHARMDPharmacist1639770019
  30. Bryan Chac, DPTPhysical Therapist1790518488
  31. Jasmine Chadha, ODOptometrist1598115784
  32. Salim Chahin, MDNeurology Physician1255539789
  33. Ajay Chalasani, MDAnesthesiology Physician1487760385
  34. Nikki Chambless, M.A., LPCMental Health Counselor1528493004
  35. Cynthia Chambliss, SLPSpeech-Language Pathologist1194027888
  36. Courtney Chapman, DMDGeneral Practice Dentistry1679303085
  37. Janet Chartrand, RN, LCSW. LPC, NCCClinical Social Worker1215080320
  38. Pin-Wen Chen, MDPhysical Medicine & Rehabilitation Physician1740779156
  39. Min Chen ChengPharmacist1740912955
  40. Colleen Chiapel, LPCProfessional Counselor1427513332
  41. Dae Choi, DDSDentist1780197400
  42. Megan ChristiansenOccupational Therapist1962049270
  43. Sam ChristofersonHearing Instrument Specialist1326827528
  44. Rachele Chrum, MPTPhysical Therapist1306976295
  45. Elizabeth CieslakMental Health Counselor1508439316
  46. Monica Ciolino, DPTPhysical Therapist1023623329
  47. Katherine Clancy, FNPNurse Practitioner1568724284
  48. Austin Clark, DPTStudent in an Organized Health Care Education/Training Program1588109078
  49. Shelby Clark, MS, CCC-SLPSpeech-Language Pathologist1902515612
  50. Kristina Clay, D.C.Chiropractor1629034426

The largest Missouri cities

  1. Saint Louis27,605
  2. Kansas City13,759
  3. Springfield6,403
  4. Columbia6,004
  5. Joplin2,443

All of Missouri →

How to read this directory

O Fallon, Missouri appears in the CMS National Plan and Provider Enumeration System with 1,225 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 Physical Therapist (131 clinicians, followed by Speech-Language Pathologist with 119 and Pharmacist with 84). 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 Missouri's population, O Fallon reports roughly 19.8 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 Missouri's most common specialties, Behavior Technician 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, MO?

There are 1,225 registered healthcare providers in O Fallon, MO, 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 Physical Therapist, Speech-Language Pathologist, Pharmacist, Professional Counselor, Chiropractor. Physical Therapist has the most providers with 131.

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.