NPPES file of Aug 9, 2026

Doctors and health care providers in Crystal Lake, IL

1,442 individual NPPES records list a practice address in Crystal Lake, 28th of 541 Illinois cities. The largest group is behavior technician: 120, 8% of the city's records, against 4% across Illinois. Page 15 of 29.

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

The 8 largest groups in Crystal Lake

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

Crystal Lake in Illinois

  • Rank in Illinois28th of 541 cities by records
  • Share of the state0.6% of Illinois's records
  • Specialties present25 or more taxonomy codes
  • Top three groups21% of all records

Compared with Illinois as a whole, Crystal Lake has 2.5× the state's share of occupational therapy assistant records and 0.41× its share of internal medicine physician records.

Providers in Crystal Lake, alphabetically

  1. Stacey Knuth, RPHPharmacist1326320516
  2. Claire KochSocial Worker1568821585
  3. Susan KoerberHome Health Registered Nurse1497942148
  4. Ricardo Kohn, MDNeurology Physician1295720886
  5. Whitney Kohn, LPCProfessional Counselor1780406967
  6. Kali Koller, LPCMental Health Counselor1699693911
  7. Jennifer KolzeClinical Psychologist1588101992
  8. Thomas Kopp, DDS.Dentist1528144607
  9. Brandon Korfel, DCChiropractor1497192546
  10. Natalie Kostinsky, M.D.Family Medicine Physician1205835881
  11. Amber Koteles, PTPhysical Therapist1275853731
  12. Carol Kotzan, M.D.Internal Medicine Physician1710950100
  13. Melissa Kowasz-McKim, D.C.Chiropractor1174668438
  14. Stephen Kozlowski, M.D.Rheumatology Physician1285749390
  15. Linda Kramer, APNNurse Practitioner1134784861
  16. Margaret Krase, LCSWClinical Social Worker1497599740
  17. Natalia KrasuskaSpeech-Language Pathologist1245954742
  18. Jessica Kreis, LCPCProfessional Counselor1912565391
  19. Yolanta KreklowPsychiatric/Mental Health Nurse Practitioner1750804167
  20. Kathleen Kretchmer, R.N., C.D.EDiabetes Educator Registered Nurse1053753582
  21. Katie Kroening, LCSWClinical Social Worker1548718844
  22. Tracy Kroening, PTAPhysical Therapy Assistant1922723444
  23. Elizabeth Krotser, LCSWClinical Social Worker1235571290
  24. Marko Krpan, DOOrthopaedic Hand Surgery Physician1992871347
  25. Laura KruppeHearing Instrument Specialist1417596040
  26. Samuel Krus, BCBABehavior Analyst1841787363
  27. Jacquelyn Ksiazkiewicz, PTPhysical Therapist1528496833
  28. Gregory Kubik, D.D.S.Dentist1417033150
  29. Robyn Kubik, LPCProfessional Counselor1194553974
  30. Gregory Kuhlman, DCChiropractor1306871298
  31. Agnieszka Kumar, DDSGeneral Practice Dentistry1366606204
  32. Thomas KwasiborskiPharmacist1598045049
  33. David Kwon, D.D.SGeneral Practice Dentistry1982793493
  34. Marilyn Lacrosse, M.D.Family Medicine Physician1255376885
  35. Barbara Ladd, LCSWClinical Social Worker1003053547
  36. Effie Lafazanos, RDH PHDHDental Hygienist1790389369
  37. Zoee Lagerhausen, OTR/LOccupational Therapist1073205340
  38. Mark Lagerkvist, D.C.Chiropractor1578574604
  39. Kevin Lahey, LSWClinical Social Worker1043182298
  40. Katlin LakotaFamily Nurse Practitioner1487573937
  41. Amy LancasterSocial Worker1205215639
  42. David Land, HISHearing Instrument Specialist1457238941
  43. Amanda Landon, COTAOccupational Therapy Assistant1245088608
  44. Jessica Lang, M.S.Speech-Language Pathologist1255400263
  45. Amanda Lareau, M.D.Dermatology Physician1740417286
  46. Laurie Larsen, PHD, LCPCProfessional Counselor1902103815
  47. Lillie Larsen, REGISTERED DIETICIANRegistered Dietitian1003988130
  48. Sharon Larsen, DNP - APNFamily Nurse Practitioner1861785032
  49. Rene Las, BCBABehavior Analyst1548759202
  50. Nanette Lasco, MSW, LCSWClinical Social Worker1114097177

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

Crystal Lake, Illinois appears in the CMS National Plan and Provider Enumeration System with 1,442 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 Crystal Lake - 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 Crystal Lake 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 Crystal Lake is weighted toward Behavior Technician (120 clinicians, followed by Physical Therapist with 92 and Clinical Social Worker with 91). 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, Crystal Lake reports roughly 11.5 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 Crystal Lake practice address, a coverage gap Crystal Lake patients typically fill by traveling to a larger nearby hub.

For Crystal Lake 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 Crystal Lake, IL?

There are 1,442 registered healthcare providers in Crystal Lake, IL, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Crystal Lake?

The most common specialties in Crystal Lake are Behavior Technician, Physical Therapist, Clinical Social Worker, Professional Counselor, Speech-Language Pathologist. Behavior Technician has the most providers with 120.

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.