NPPES file of Aug 9, 2026

Doctors and health care providers in Chelmsford, MA

937 individual NPPES records list a practice address in Chelmsford, 56th of 406 Massachusetts cities. The largest group is behavior technician: 80, 9% of the city's records, against 5% across Massachusetts. Page 17 of 19.

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

The 8 largest groups in Chelmsford

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

Chelmsford in Massachusetts

  • Rank in Massachusetts56th of 406 cities by records
  • Share of the state0.4% of Massachusetts's records
  • Specialties present25 or more taxonomy codes
  • Top three groups23.2% of all records

Compared with Massachusetts as a whole, Chelmsford has 3.7× the state's share of behavior analyst records and 0.21× its share of student in an organized health care education/training program records.

Providers in Chelmsford, alphabetically

  1. Francheyska Silfa Mazara, M.D.Pediatrics Physician1316137458
  2. Alexa SilvaSocial Worker1831884360
  3. Luella Simakauskas, OTR/LOccupational Therapist1124426077
  4. Andrew Simkin, M.D.Dermatology Physician1730179623
  5. Cedrick SimonBehavior Technician1700779477
  6. Patrycja Simoneau, LMHCMental Health Counselor1962157305
  7. William Sinausky, RPHPharmacotherapy Pharmacist1497924559
  8. Lakshmi Sivasankar, M.D.Internal Medicine Physician1497799779
  9. Kayla SmithBehavior Analyst1366087496
  10. Rebecca Snelgrove, LMHCMental Health Counselor1275516403
  11. Marlene Snider, PHARMACISTPharmacist1790197895
  12. Lisa Sobhian, LICSWClinical Social Worker1902495344
  13. Deborah Solomon, PSY.D.Clinical Psychologist1801993423
  14. Janarthanan Someswarananthan, MDInternal Medicine Physician1134212830
  15. Amanda SorensenCounselor1053262394
  16. Laurie Soroken, NURSE PRACTITIONERRegistered Nurse1750479291
  17. Kaiya SparksBehavior Technician1184583205
  18. Jeffrey Speller, M.D.Psychiatry Physician1093808248
  19. Adina SreyPharmacist1730783424
  20. Patrick SsekyoleMarriage & Family Therapist1467182220
  21. Caitlin StairsSchool Social Worker1295274975
  22. Caroline Stark, DPTPhysical Therapist1568060267
  23. Eric Stein, MDOtolaryngology Physician1053309328
  24. Mark Stevens, D.M.D.Dentist1982053203
  25. Michela Stone, M.S., CCC-SLPSpeech-Language Pathologist1902500564
  26. Jessica Stott, BCBABehavior Analyst1336568930
  27. Barbara Stryker, MSPTPhysical Therapist1972951143
  28. Louis Stylos, D.M.D.General Practice Dentistry1982707253
  29. Jacques Hagop Sulahian, M.DPediatrics Physician1780849943
  30. Caitlin SullivanBehavior Analyst1184217903
  31. Kelsey Sullivan, MSN, FNP-BCFamily Nurse Practitioner1487270385
  32. Rekha Sundar, M.D.Internal Medicine Physician1356308597
  33. Rachel SurridgePhysician Assistant1659143840
  34. Brittany Sutton, BCBABehavior Analyst1952297566
  35. Sheila Swales, NPPsychiatric/Mental Health Nurse Practitioner1770746836
  36. Divya Swarup, D.M.D.Dentist1245608041
  37. Kathleen Sweeney, PTPhysical Therapist1902938608
  38. Cristen Sweet, LICSW, LADCClinical Social Worker1831294925
  39. Cameron SwitzerClinical Social Worker1831643303
  40. Steven Tambascio, D.C.Chiropractor1508273236
  41. Dickens Tamukedde, LPNLicensed Practical Nurse1659854545
  42. Weileen TanPharmacist1760658454
  43. Alison Tassinari, NPFamily Nurse Practitioner1770992174
  44. Ashley Tavares, FNPInternal Medicine Physician1730546284
  45. Ashley Taylor, LICSWClinical Social Worker1598058000
  46. Erica TaylorBehavior Technician1447816335
  47. Nancy Taylor, BCBABehavior Analyst1770181497
  48. Jill Tays, D.C.Chiropractor1659414282
  49. Kedar Thomas, LICSWClinical Social Worker1144747445
  50. Kathryn ThompsonRegistered Nurse1881089803

The largest Massachusetts cities

  1. Boston41,865
  2. Worcester13,166
  3. Springfield8,553
  4. Cambridge5,145
  5. Brockton4,287

All of Massachusetts →

How to read this directory

Chelmsford, Massachusetts appears in the CMS National Plan and Provider Enumeration System with 937 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 Chelmsford - 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 Chelmsford 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 Chelmsford is weighted toward Behavior Technician (80 clinicians, followed by Behavior Analyst with 74 and Mental Health Counselor with 63). 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 Massachusetts's population, Chelmsford reports roughly 13.4 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 Massachusetts's most common specialties, Developmental Therapist is the most prominent one with no provider currently listing a Chelmsford practice address, a coverage gap Chelmsford patients typically fill by traveling to a larger nearby hub.

For Chelmsford 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 Chelmsford, MA?

There are 937 registered healthcare providers in Chelmsford, MA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Chelmsford?

The most common specialties in Chelmsford are Behavior Technician, Behavior Analyst, Mental Health Counselor, Clinical Social Worker, Physical Therapist. Behavior Technician has the most providers with 80.

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.