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 14 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. Karen OnuohaLicensed Vocational Nurse1225637630
  2. Anitha Oommen, M.S., BCBA, LABABehavior Analyst1801779392
  3. Maria Orlando, LICSWClinical Social Worker1700176245
  4. Lucero Orozco AvilaBehavior Technician1033061700
  5. Joy Osborne, NPAdult Health Nurse Practitioner1952542607
  6. Afia Osei Assibey, RNRegistered Nurse1255179826
  7. Dagmara Osmanska-Jac, M.DInternal Medicine Physician1053413138
  8. Kira OzerPhysician Assistant1861365975
  9. Shannon Paci, APRNFamily Nurse Practitioner1376160788
  10. Isabella Paiva-Gusmao, NPAdult Health Nurse Practitioner1528619657
  11. Natalia PalacioBehavior Analyst1326601022
  12. Patrice Palmer-RussellPharmacist1194985127
  13. Michael Palmieri, PHARMDPharmacist1942801626
  14. Jacqueline Parker-Wong, MA, LMHCMental Health Counselor1265781215
  15. Randal Parradee, DMDGeneral Practice Dentistry1336344209
  16. Lucas Parsons, DPTPhysical Therapist1568074086
  17. Ankit Patel, M.D.Internal Medicine Physician1083096317
  18. Hiren PatelPharmacist1639773146
  19. Maitul PatelPhysical Therapist1770941585
  20. Shivam Patel, PHARMDPharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1659968089
  21. Tulsi PatelNurse Practitioner1699563916
  22. Hetali Patel-FazzolariFamily Nurse Practitioner1609761642
  23. Alina Patton, PHARMDPharmacist1477041549
  24. Samantha Paul BlancBehavior Technician1083507750
  25. Katherine Pedro-Medeiros, BA,LSWACounselor1104328459
  26. Angelica Peeper, MS, BCBA, LABABehavior Analyst1558813659
  27. Miguel Peixoto, NP-CFamily Nurse Practitioner1083670764
  28. Victoria Pelletier, MPAS PA-CMedical Physician Assistant1801167598
  29. Tatiana Perepelkina, MDOphthalmology Physician1972162469
  30. Leah Perez, BSCounselor1912499815
  31. Sasha PerezMental Health Counselor1699421123
  32. Charlene PerkinsCounselor1447787189
  33. David Perkins, MDOphthalmology Physician1154313245
  34. Nichole Perrin, APRN, FNP-CFamily Nurse Practitioner1053903831
  35. John PerryPharmacist1386927549
  36. Brooke Pessinis, LMHC, LADCProfessional Counselor1659812329
  37. James PetipasCounselor1326638917
  38. Stephanie PhelanCase Manager/Care Coordinator1023769551
  39. Chanelle PichardoBehavior Technician1548105588
  40. John Pietrasik, D.D.S.Dentist1558566380
  41. Carolanne Pilcher, NPFamily Nurse Practitioner1093298812
  42. Megan Pinette, PSYDClinical Psychologist1053805390
  43. Elise Piracha, BCBABehavior Analyst1972146686
  44. Stephanie PiresBehavior Technician1740824127
  45. Alexa PlentzasSurgical Physician Assistant1588554885
  46. Jennifer PlourdeBehavior Technician1649756313
  47. Jocynia Pol-FrechetteBehavior Analyst1417429697
  48. Caitlin Polistena, MDSurgery Physician1508284084
  49. Ruby PolitanoSocial Worker1821919663
  50. Vanessa Poma, BCBABehavior Analyst1417467481

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.