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 7 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. April Davidson, BA, DTDevelopmental Therapist1396972477
  2. Elijah DavidsonBehavior Technician1699626457
  3. Seir Fen Davidson, PHARMDPharmacist1417557596
  4. Ryan Davis, LMFT, ATRMarriage & Family Therapist1043515521
  5. Catherine Dean, PSYDPsychologist1356340616
  6. Linda DeandaBehavior Technician1922566272
  7. Julia DeatherageBehavior Analyst1962191726
  8. Stacy Decristofaro, DTDevelopmental Therapist1134451552
  9. Cara DefriscoSocial Worker1780069682
  10. Richard Deibel, PTPhysical Therapist1376784967
  11. Michelle Delarosa, LCPCProfessional Counselor1023334802
  12. Katherine Delli Paoli, MS, OTR/LPediatric Occupational Therapist1629221031
  13. Katherine Demunno, OTR/LOccupational Therapist1508031444
  14. Kathleen Deroche, LCSWSocial Worker1528067824
  15. Christina Deroo, MOT, OTR/LOccupational Therapist1336477538
  16. Donna Derose, APNPsychiatric/Mental Health Nurse Practitioner1285168120
  17. Nikul Desai, DPTPhysical Therapist1427833573
  18. Ali Dia, D.C.Chiropractor1679967434
  19. Amanda Diamond, PA-CPhysician Assistant1003147406
  20. Tania DiazPhysician Assistant1366070955
  21. Tara Dickel, RPHPharmacist1649627118
  22. William DicksonProfessional Counselor1437899952
  23. Krista DiehlMental Health Counselor1659088771
  24. Brooklyn DiemerBehavior Technician1437960416
  25. Jennifer DieneltDevelopmental Therapist1679031223
  26. Rhianon DienhartBehavior Technician1336702422
  27. Luanne DignadiceBehavior Analyst1124667464
  28. Nicole DillonBehavior Technician1023677002
  29. Jane Dintzner, LMTMassage Therapist1710437694
  30. Kirsten DionelaOccupational Therapist1427812593
  31. Amelia Discher, RDRegistered Dietitian1477315364
  32. Robert Disselhorst, LSWCounselor1982530580
  33. Michelle Djus, BSW, CADCAddiction (Substance Use Disorder) Counselor1164023180
  34. David DoHearing Instrument Specialist1760099287
  35. Mary Kay Dobbeck, P.T.Physical Therapist1912021031
  36. Kimberly Doerr, MS/CCC-SLPSpeech-Language Pathologist1922094275
  37. Edward Dolezal, MDOphthalmology Physician1821045782
  38. Maryann Dolezal, LCPCProfessional Counselor1548749708
  39. Michael DollarBehavior Technician1336921147
  40. Denise Donovan, PTPhysical Therapist1255799672
  41. Domenica DoroProfessional Counselor1194485722
  42. Kendra Dorschner, RBTBehavior Technician1154141125
  43. Brittney DouglasBehavior Technician1174381719
  44. Lauren DraegerPhysical Therapist1710414107
  45. Ashley Drake, APRNFamily Nurse Practitioner1487347159
  46. Lacie Driscol, MSN APRN CNMAdvanced Practice Midwife1295593226
  47. Katarzyna DrozdzynskiPhysical Therapy Assistant1154000255
  48. Cynthia Duarte, LCSWClinical Social Worker1982251617
  49. Haley Dubois, RBTBehavior Technician1073339883
  50. Abigail Duffy, MS CCC-SLPSpeech-Language Pathologist1407571995

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.