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 291 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. Rebecca Greenspan, DOPhysical Medicine & Rehabilitation Physician1831727114
  2. Scott Greenspan, PH.D.Psychologist1891132676
  3. Aaron Greenspun, MDAnesthesiology Physician1326784083
  4. Jane Greenstein, PH.D.Clinical Child & Adolescent Psychologist1104186386
  5. Patricia Greenstein, MDNeurology Physician1396788972
  6. Scott Greenstein, M.D.Ophthalmology Physician1164484804
  7. Elizabeth Greenwald, MD, MSCPsychiatry Physician1083174916
  8. Jeffrey Greenwald, M.D.Internal Medicine Physician1326023466
  9. Kelsy Greenwald, MDEmergency Medicine Physician1578093720
  10. Kaitlyn GreenwayClinical Social Worker1730021296
  11. Katie Greenzang, M.D.Pediatric Hematology & Oncology Physician1437391000
  12. Kent Greep, MDStudent in an Organized Health Care Education/Training Program1114482775
  13. Aubrey Greer, MDAnesthesiology Physician1770110611
  14. David Greer, MDVascular Neurology Physician1003807215
  15. Jonathan Greer, M.D.Surgical Oncology Physician1194985614
  16. Joseph Greer, PHDPsychologist1538194691
  17. Maya Greer, MSN, FNPFamily Nurse Practitioner1538670138
  18. Michelle Greer, PA-CPhysician Assistant1144579723
  19. Roman Greer, PAPhysician Assistant1245687144
  20. Tyler Greffrath, DPTPhysical Therapist1649986266
  21. Emily Gregonis, RNPsychiatric/Mental Health Nurse Practitioner1629780986
  22. Kristin Gregor, PH.D.Clinical Psychologist1609170083
  23. Lydia Gregoret, AUDAudiologist1487089553
  24. Bryn GregorySocial Worker1669209920
  25. Kameko GregoryChild & Adolescent Psychiatric/Mental Health Registered Nurse1598490401
  26. Katherine Gregory, MDStudent in an Organized Health Care Education/Training Program1629877055
  27. Margaret Gregowicz, M.S., CCC-AAudiologist1255498150
  28. Dan Greif, PSYDPsychologist1194158402
  29. Astrea Greig, PSY.D.Psychologist1346657384
  30. Ashley Greiner, M.D., M.P.H.Emergency Medicine Physician1528383221
  31. Jack Greiner, D.O.Ophthalmology Physician1588601280
  32. Anna Greka, M.D.Internal Medicine Physician1679672596
  33. Marc Grella, MDPediatrics Physician1699765750
  34. Jillian Grelle, PTPhysical Therapist1427275981
  35. Hayley Grelson, PA-CPhysician Assistant1174169700
  36. Pierre-Olivier Grenier, M.D.Pediatric Dermatology Physician1144881160
  37. Rachel Grenier, MDDiagnostic Radiology Physician1497214506
  38. Samantha Grenier, PA-CMedical Physician Assistant1215393061
  39. Richard Grentzenberg, M.D.Otolaryngology Physician1538122536
  40. Seth Gresham, DPTPhysical Therapist1699334169
  41. Samuel Gretz, MDInternal Medicine Physician1134706088
  42. Hendrik Greve, MD, PHDStudent in an Organized Health Care Education/Training Program1508626086
  43. Laura Greve, PSYDClinical Psychologist1477610871
  44. Joannes Grevelink, MD PHDDermatology Physician1538150982
  45. Jeremy GrevetStudent in an Organized Health Care Education/Training Program1346876281
  46. Eric Grewal, MDClinical Pathology/Laboratory Medicine Physician1669121943
  47. Samuel Grewe, MDStudent in an Organized Health Care Education/Training Program1295536142
  48. Claire Greydanus, MDStudent in an Organized Health Care Education/Training Program1356289102
  49. Katherine Gribbons, MDStudent in an Organized Health Care Education/Training Program1902500283
  50. Marissa Griecci, CRNACertified Registered Nurse Anesthetist1992020952

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.