NPPES file of Aug 9, 2026

Doctors and health care providers in Naperville, IL

4,634 individual NPPES records list a practice address in Naperville, 3rd of 541 Illinois cities. The largest group is professional counselor: 329, 7% of the city's records, against 4% across Illinois. Page 61 of 93.

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

The 8 largest groups in Naperville

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

Naperville in Illinois

  • Rank in Illinois3rd of 541 cities by records
  • Share of the state1.9% of Illinois's records
  • Specialties present25 or more taxonomy codes
  • Top three groups19.4% of all records
  • Professional Counselor rank2nd of the 10 Illinois cities with the most

Compared with Illinois as a whole, Naperville has 2.1× the state's share of behavior analyst records and 0.54× its share of internal medicine physician records.

Providers in Naperville, alphabetically

  1. Victor OkamgbaFamily Nurse Practitioner1629434741
  2. Laura Okehie Dike, PMHNPPsychiatric/Mental Health Nurse Practitioner1457208704
  3. Obi Okoye, M.D.Surgery Physician1942640693
  4. Olamide Oladeji, ATCAthletic Trainer1659830255
  5. Shakirat OlanrewajuPsychiatric/Mental Health Nurse Practitioner1750243325
  6. Cristina Olarov, D.D.S.Endodontics1588977516
  7. Oana Olaru, MDHospitalist Physician1669466447
  8. Jonas OlczykMental Health Counselor1053032680
  9. Jamie Oleaga, M.D.Gastroenterology Physician1265878813
  10. Joseph Oleck, LCSWClinical Social Worker1518461680
  11. Michelle Olenek, MSOT, OTR/L, BCPOccupational Therapist1508310004
  12. Kathryn Olewine, NPFamily Nurse Practitioner1790438547
  13. Amanda Oliden, PA-CSurgical Physician Assistant1689269078
  14. Kara Olimene, LCSWSocial Worker1861568636
  15. Chad Olsen, M.D.Pediatrics Physician1073646477
  16. Katherine Olsen, PA-CPhysician Assistant1386374932
  17. Kelsie OlsenOccupational Therapist1811769334
  18. Christopher Olson, MDObstetrics & Gynecology Physician1265422448
  19. Kiya Olson, MA & M.S.Behavior Analyst1174658629
  20. Heather Olsson, MA, LCPCProfessional Counselor1316227440
  21. Curtis Omana, RBTBehavior Technician1639669062
  22. Jeremy Omerod, LCPCProfessional Counselor1457558561
  23. Kathleen Omerod, APN CCNSClinical Nurse Specialist1477818557
  24. Chinenye Onakorame, APRN, PMHNP BCPsychiatric/Mental Health Nurse Practitioner1588487946
  25. Jeanne Ondyak, CNPFamily Nurse Practitioner1346202165
  26. Connie Onik, D. M. D.General Practice Dentistry1720319445
  27. Audrey OnyschakOccupational Therapist1306075106
  28. Barbara Opalka, D.O.Family Medicine Physician1063404150
  29. Carla Ordonez, PH.D., LMFTMarriage & Family Therapist1053537720
  30. Ron Oren, MDAdvanced Heart Failure and Transplant Cardiology Physician1366422438
  31. Christopher Orenczak, DCChiropractor1992714216
  32. Liezl Oreta, LPTPhysical Therapist1891718292
  33. Barbara OrlicPhysical Therapy Assistant1447642962
  34. Kerri Oros, LCSWClinical Social Worker1639401383
  35. Kerry Orourke, OTR/LPediatric Occupational Therapist1912119033
  36. Amy Orsini, MDMOHS-Micrographic Surgery Physician1013933431
  37. Allison OrtliebBehavior Analyst1992301568
  38. Francis OsazuwaPsychiatric/Mental Health Nurse Practitioner1861342156
  39. Michelle OsentoskiOccupational Therapist1619458486
  40. Diane Osepek, PHARMACISTPharmacist1275882219
  41. Marylouise Osetek, APNPrimary Care Nurse Practitioner1730865353
  42. James Ostrenga, M.D.Cardiovascular Disease Physician1801983648
  43. Stephanie Ott, LPCProfessional Counselor1154166775
  44. Jennifer Otto, LPCProfessional Counselor1669235818
  45. Kimberly Otto, APNFamily Nurse Practitioner1649672668
  46. Mark Ottolin, M.D.Cardiovascular Disease Physician1265525729
  47. Domenica OttolinoClinical Social Worker1255886974
  48. Basma Outhman, LSWSocial Worker1699344069
  49. Brian OverPharmacist1093181182
  50. Paula Overstreet, ARNP-BCNurse Practitioner1356326276

The largest Illinois cities

  1. Chicago63,379
  2. Springfield4,997
  3. Peoria4,621
  4. Evanston4,013
  5. Rockford3,893

All of Illinois →

How to read this directory

Naperville, Illinois appears in the CMS National Plan and Provider Enumeration System with 4,634 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 Naperville - 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 Naperville 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 Naperville is weighted toward Professional Counselor (329 clinicians, followed by Clinical Social Worker with 307 and Physical Therapist with 263). 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, Naperville reports roughly 36.9 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, Student in an Organized Health Care Education/Training Program is the most prominent one with no provider currently listing a Naperville practice address, a coverage gap Naperville patients typically fill by traveling to a larger nearby hub.

For Naperville 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 Naperville, IL?

There are 4,634 registered healthcare providers in Naperville, IL, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Naperville?

The most common specialties in Naperville are Professional Counselor, Clinical Social Worker, Physical Therapist, Behavior Technician, Speech-Language Pathologist. Professional Counselor has the most providers with 329.

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.