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 25 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. Krishanthi Seneviratne, MDFamily Medicine Physician1972814267
  2. Andrea Sept, M.A., CCC-SLP/LSpeech-Language Pathologist1215309877
  3. Natalye Serrano, RBTBehavior Technician1194535716
  4. Jill Shadel, CDSDevelopmental Therapist1831303825
  5. Tracy Shadley, FNPPsychiatric/Mental Health Clinical Nurse Specialist1699263731
  6. Aleen Shah, PA-CPhysician Assistant1942612668
  7. Hemang Shah, PHARMDPharmacist1831473511
  8. Pooja ShahNurse Practitioner1558951731
  9. Rachit Shah, DPMFoot & Ankle Surgery Podiatrist1578147492
  10. Soniya ShahPhysician Assistant1619586096
  11. Mary SheehanBehavior Technician1669283784
  12. Emily Shen, MDFamily Medicine Physician1871779744
  13. Amanda ShepitBehavior Analyst1659845816
  14. Margaret Sherwood, DPTPhysical Therapist1356717995
  15. Dong ShinBehavior Analyst1548753668
  16. David Shinherr, DCChiropractor1043286081
  17. Renee ShoppRegistered Nurse1942669064
  18. Jessica SikoraSpeech-Language Pathologist1487332292
  19. Dennis Silver, MDFamily Medicine Physician1780726273
  20. Karyn Silvestri, OTR/LOccupational Therapist1033467956
  21. Allyson Simmonds, PT, DPTPhysical Therapist1962827774
  22. Jannette SimmonsMarriage & Family Therapist1942989124
  23. Debra Simpson, LCPCProfessional Counselor1699879742
  24. Candace Sinclair, LCPCMental Health Counselor1942395512
  25. Katarzyna Siudyla, COTAOccupational Therapy Assistant1568037901
  26. Aneta Slaba, BCBABehavior Analyst1174199129
  27. Nicole Slimko, PA-CPhysician Assistant1851267975
  28. April SliwkaPhysical Therapist1881185171
  29. Mari SmallSocial Worker1780031849
  30. Lessi Smebakken, LCSWSocial Worker1609875616
  31. Julie Smiley, M.A.Developmental Therapist1255505202
  32. Corey SmithProfessional Counselor1578101044
  33. Cynthia Smith, CNP, ACNPAcute Care Nurse Practitioner1134149115
  34. Denise Smith, PTPhysical Therapist1801989819
  35. Jacob SmithHearing Instrument Specialist1528544152
  36. Jessica SmithClinical Social Worker1831863877
  37. Melissa Smith, M. A., CCC-SLPSpeech-Language Pathologist1407137821
  38. Diana SmithanaSpeech-Language Pathologist1013411669
  39. Jillian SmolinskiPediatric Physical Therapist1649612748
  40. Michael Socha, D.C.Chiropractor1326473398
  41. Sandra SolarteBehavior Technician1457918120
  42. Lenia Solorio, FNPFamily Nurse Practitioner1033062153
  43. Edward SongPharmacist1548541311
  44. Ruchi Sood, MDNephrology Physician1700191343
  45. Dawn Sopron, L.C.S.W.Clinical Social Worker1932133188
  46. Caressa Sorensen, COTAOccupational Therapy Assistant1154090447
  47. Christine Sorensen, PTPhysical Therapist1659444230
  48. Chastity Sosa, OTR/LOccupational Therapist1932522216
  49. Angelica Soto, MSN,APRN,PMHNP-CPsychiatric/Mental Health Nurse Practitioner1063235505
  50. Jawhara Soudagar, PHARMDPharmacist1932486487

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.