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 395 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. Kevin Kleffman, MD, PHDStudent in an Organized Health Care Education/Training Program1578204418
  2. Margaret Klehm, CPNPPediatric Nurse Practitioner1437360278
  3. Maggie Kleiman, PNP-PCPediatric Nurse Practitioner1083458376
  4. Andreas Klein, MDHematology & Oncology Physician1285740969
  5. Anna KleinMental Health Counselor1174072532
  6. Brittany Klein, DDSOral Medicine Dentistry1114554219
  7. Carol Klein, MSWClinical Social Worker1629180286
  8. Haley Klein, PA-CPhysician Assistant1376080028
  9. Hara Klein, LMHCMental Health Counselor1194875153
  10. Harrison KleinPsychiatric/Mental Health Nurse Practitioner1235995333
  11. Isaac Klein, M.D., PH.D.Internal Medicine Physician1780022269
  12. Jessica Klein, MDNeurology with Special Qualifications in Child Neurology Physician1619201472
  13. Joshua Klein, MDObstetrics & Gynecology Physician1063554392
  14. Joshua Klein, M.D., PH.D.Neurology Physician1053446013
  15. Karen Klein, M.D.Pediatrics Physician1154309235
  16. Katherine Klein, D.M.D., M.S.Orthodontics and Dentofacial Orthopedics Dentistry1750362414
  17. Kirsten Klein, MSStudent in an Organized Health Care Education/Training Program1477390466
  18. Michael Klein, M.D.Cardiovascular Disease Physician1073541256
  19. Pamela Klein, RNRegistered Nurse1700928256
  20. Piers KleinStudent in an Organized Health Care Education/Training Program1346198660
  21. Rachel Klein, LICSWClinical Social Worker1245732825
  22. Reva Klein, M.D.Neurology Physician1285640888
  23. Robert Klein, M.D.Psychiatry Physician1124175609
  24. Rona Klein, M.D.Psychiatry Physician1750448007
  25. Sandra Klein, CRNACertified Registered Nurse Anesthetist1558684811
  26. Taylor Klein, RD, LDNRegistered Dietitian1407627110
  27. Andrew Kleinberger, MDOtolaryngology Physician1598925208
  28. Jane Kleinjan, NPAdult Health Nurse Practitioner1730391392
  29. Lauren Kleinkauf-Young, NPAcute Care Nurse Practitioner1407089097
  30. Monica Kleinman, MDNeonatal-Perinatal Medicine Physician1831151711
  31. Paul Kleinman, MDPediatrics Physician1144301342
  32. Ronald Kleinman, MDPediatric Gastroenterology Physician1154312767
  33. Katheryn KleitsasClinical Social Worker1477889327
  34. Giannoula Klement, MDPediatric Hematology & Oncology Physician1174579718
  35. Jennifer Klemm, N.P.Acute Care Nurse Practitioner1528193216
  36. Meaghan Klempa, PA-CSurgical Physician Assistant1770938086
  37. Maxine Klenicki, MSWClinical Social Worker1134287691
  38. Veronica Klepeis, MD, PHDAnatomic Pathology & Clinical Pathology Physician1417152034
  39. Stephen KlepferPediatrics Physician1730685629
  40. Sarah KlerInternal Medicine Physician1366028409
  41. Elizabeth Klerman, MD PHDGeneral Practice Physician1487621777
  42. Esther Kletter, LICSWClinical Social Worker1629023049
  43. Anne Klibanski, MDEndocrinology, Diabetes & Metabolism Physician1518958164
  44. Stacy Klickstein, LICSWClinical Social Worker1841704194
  45. Lindsay Klickstein-Kahrs, MDStudent in an Organized Health Care Education/Training Program1063213064
  46. Alexandra KlierDevelopmental Therapist1629514039
  47. Victoria Kliewe, MDInternal Medicine Physician1235889890
  48. Corrine KlimentInternal Medicine Physician1801180872
  49. Emily Kline, PHDClinical Psychologist1306375845
  50. Lauren Kling, P.T.Physical Therapist1790145340

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.