NPPES file of Aug 9, 2026

Doctors and health care providers in Boston, MA

41,865 individual NPPES records list a practice address in Boston, 1st of 406 Massachusetts cities. The largest group is students in training: 6,126, 15% of the city's records, against 5% across Massachusetts. Page 111 of 838.

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

The 8 largest groups in Boston

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

Boston in Massachusetts

  • Rank in Massachusetts1st of 406 cities by records
  • Share of the state19.1% of Massachusetts's records
  • Specialties present25 or more taxonomy codes
  • Top three groups24.7% of all records
  • Students in training rank1st of the 10 Massachusetts cities with the most

Compared with Massachusetts as a whole, Boston has 2.9× the state's share of student in an organized health care education/training program records and 0.23× its share of mental health counselor records.

Providers in Boston, alphabetically

  1. Lucienne Cahen, MDPediatrics Physician1184649014
  2. Carol Cahill, PCNSAdult Psychiatric/Mental Health Clinical Nurse Specialist1932232006
  3. Daniel Cahill, MD PHDNeurological Surgery Physician1336113679
  4. Kristen Cahill, APRNPsychiatric/Mental Health Nurse Practitioner1003027574
  5. Lucas Cahill, MDStudent in an Organized Health Care Education/Training Program1134923303
  6. Sara Cahill, MDHospitalist Physician1003439944
  7. Sarah Cahill, P.A.-CPhysician Assistant1750668695
  8. Amy Cahill Hickey, MSW, LICSWClinical Social Worker1780697995
  9. Julie Cahill-Hollingsworth, NURSE PRACTITIONERAcute Care Nurse Practitioner1902958218
  10. Gale Cahoon, NPPrimary Care Nurse Practitioner1447291802
  11. Jennifer Cahoon, M.AC.Acupuncturist1639310337
  12. Alice Cai, M.D.Neurology Physician1881056422
  13. Christopher Cai, MDInternal Medicine Physician1265010250
  14. Jason Cai, MDDiagnostic Radiology Physician1689250359
  15. Li Li Cai, LIC. AC.Acupuncturist1013084748
  16. Peter Cai, M.D.Pediatric Urology Physician1093177339
  17. Xuemei Cai, M.D.Neurology Physician1760619209
  18. Carlos CaicedoStudent in an Organized Health Care Education/Training Program1437017092
  19. Johanna Caicedo, M.DStudent in an Organized Health Care Education/Training Program1043914906
  20. Marco Caicedo, MDPsychiatry Physician1972535664
  21. Pierre Caidor, DISPENSING OPTICIANOptician1538550355
  22. Catherine Caillouette, RN, CPNPPediatric Nurse Practitioner1538381231
  23. Amanda Cain, MDObstetrics & Gynecology Physician1265933949
  24. Cooper Cain, M.D.Diagnostic Radiology Physician1053844209
  25. Haley CainPharmacist1689544405
  26. Lori CainSocial Worker1225572779
  27. Leslie Caiola, MS, RDN, LDNRegistered Dietitian1467115394
  28. Toryn Cairo, PA-CPhysician Assistant1326707647
  29. Steven Cajamarca, MDInternal Medicine Physician1598496796
  30. Naeel Cajee, DMDEndodontics1578963740
  31. Io Camille CajesStudent in an Organized Health Care Education/Training Program1568318426
  32. Militza CajigasCounseling Psychologist1144009556
  33. Carlos Cajina, M.D.Anesthesiology Physician1992149272
  34. Ashley CakridasFamily Nurse Practitioner1053047613
  35. Joseph Calabrese, D.M.D.Dentist1881925634
  36. Samantha Calabrese, NPNurse Practitioner1982150850
  37. Anne Calabresi, MDPsychiatry Physician1245296441
  38. Matteo Calafatti, MDStudent in an Organized Health Care Education/Training Program1932969748
  39. Carla Calagua Bedoya, MDAnatomic Pathology Physician1558947978
  40. Christopher Calahan, MDInternal Medicine Physician1558821983
  41. Sean CalamiaStudent in an Organized Health Care Education/Training Program1669298345
  42. Julia Calandra, PHARMDPharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1063082089
  43. Pamela Calarese, RN NPAcute Care Nurse Practitioner1558418855
  44. Hugo Calavia Liano, MDInternal Medicine Physician1568026367
  45. Natalie Calcagni, FNPFamily Nurse Practitioner1063199669
  46. Michael CalcaterraStudent in an Organized Health Care Education/Training Program1740128578
  47. Lise Ann Caldara, PA-CPhysician Assistant1861955114
  48. Adolfo Caldas, LICSWClinical Social Worker1538455761
  49. Jennifer Calden, OTOccupational Therapist1245454859
  50. Janet Calderaro, MSN, RN, CPNP-PCPediatric Nurse Practitioner1922668383

The largest Massachusetts cities

  1. Worcester13,166
  2. Springfield8,553
  3. Cambridge5,145
  4. Brockton4,287
  5. Milford3,459

All of Massachusetts →

How to read this directory

Boston, Massachusetts appears in the CMS National Plan and Provider Enumeration System with 41,865 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 Boston - 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 Boston 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 Boston is weighted toward Student in an Organized Health Care Education/Training Program (6,126 clinicians, followed by Internal Medicine Physician with 2,320 and Clinical Social Worker with 1,906). 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, Boston reports roughly 598 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, Counselor is the most prominent one with no provider currently listing a Boston practice address, a coverage gap Boston patients typically fill by traveling to a larger nearby hub.

For Boston 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 Boston, MA?

There are 41,865 registered healthcare providers in Boston, MA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Boston?

The most common specialties in Boston are Student in an Organized Health Care Education/Training Program, Internal Medicine Physician, Clinical Social Worker, Physician Assistant, Anesthesiology Physician. Student in an Organized Health Care Education/Training Program has the most providers with 6,126.

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.