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 372 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. Paulina Karwowski, RDNRegistered Dietitian1457209389
  2. Basel Karzoun, R.PHPharmacist1790165132
  3. Nicole Kasal, MDStudent in an Organized Health Care Education/Training Program1902745821
  4. Imme Kaschner, MDAnesthesiology Physician1649323643
  5. Rachel Kasdin, MD, MSStudent in an Organized Health Care Education/Training Program1134069172
  6. Earl Kasdon, M.D.Anatomic Pathology & Clinical Pathology Physician1801050026
  7. Carlos Kase, M.D.Neurology Physician1588626626
  8. Neema Kaseje, M.D.Pediatric Surgery Physician1811060049
  9. Joseph Kaserman, M.D.Pulmonary Disease Physician1114247954
  10. Brenda Kashi, DNP, C-PNPPediatric Nurse Practitioner1821617002
  11. Zoe KashinPhysical Therapist1851119069
  12. Uriah Kashmann-Myrow, LICSWClinical Social Worker1679156897
  13. Nicole Kasimati, RN/NPAdult Health Nurse Practitioner1326312398
  14. Glenn Kasin, DCChiropractor1174281968
  15. Vivek Kasinath, M.D.Nephrology Physician1114248515
  16. Maysa Kaskas, PHDClinical Psychologist1972161008
  17. Anne Kasmar, MDInfectious Disease Physician1194716738
  18. Steven KasparekStudent in an Organized Health Care Education/Training Program1881348902
  19. Laura Kasparian, MSCCCSLPSpeech-Language Pathologist1023443041
  20. Dennis Kasper, M.D.Research Study Specialist1972654606
  21. Hallie Kasper, NPNurse Practitioner1891889762
  22. Ladan Kasraian, MDStudent in an Organized Health Care Education/Training Program1134921380
  23. Elizabeth Kass, M.D.Internal Medicine Physician1710906169
  24. Dawit KassaObstetrics & Gynecology Physician1144011859
  25. Bina Kassamali, MDStudent in an Organized Health Care Education/Training Program1508509936
  26. Ahmad Kassar, MDStudent in an Organized Health Care Education/Training Program1689504623
  27. Monica Kassavin, MDStudent in an Organized Health Care Education/Training Program1053060996
  28. Gerald Kassels, M.D.Internal Medicine Physician1093797599
  29. James Kasser, MDPediatric Orthopaedic Surgery Physician1801836887
  30. Zachary KassirInternal Medicine Physician1346971546
  31. Jonathan Kassira, MDAnesthesiology Physician1972172930
  32. Marilyn Kassirer, MDNeurology Physician1144256090
  33. Samer Kastali, D.D.S, M.S.General Practice Dentistry1851505945
  34. Teodora Kastelova, N.P.Acute Care Nurse Practitioner1689924300
  35. Laxmi KastiNurse Practitioner1750923546
  36. Bruce Kastin, M.D.Neurology Physician1255394730
  37. Ananya KasturiStudent in an Organized Health Care Education/Training Program1841044807
  38. Shanthini Kasturi, M.D.Rheumatology Physician1144531047
  39. Aarzoo KatariaStudent in an Organized Health Care Education/Training Program1851192355
  40. Deepak Kataria, M.D.Internal Medicine Physician1215623061
  41. Benjamin KatcherInternal Medicine Physician1518751700
  42. Ashley Katchky, DDSStudent in an Organized Health Care Education/Training Program1265814099
  43. Negin Katebi, D.D.SOrthodontics and Dentofacial Orthopedics Dentistry1770916728
  44. Jonathan KatechisStudent in an Organized Health Care Education/Training Program1720823206
  45. Katherine Kates, FNPFamily Nurse Practitioner1083929459
  46. Kimberley KatesCounselor1922584887
  47. Rebecca Kath, PNPPediatric Nurse Practitioner1780343558
  48. Ummul-Kiram Kathawalla, PHDPsychologist1003532862
  49. Sekar Kathiresan, MDInternal Medicine Physician1134101280
  50. Martin Kathrins, MDUrology Physician1073748554

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.