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 243 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. Kathleen Flaherty, RNLactation Consultant (Registered Nurse)1609462464
  2. Keith Flaherty, MDMedical Oncology Physician1861422966
  3. Madeline Flaherty, RN, FNP-BCNurse Practitioner1619644176
  4. Michael Flaherty, D.O.Pediatrics Physician1679862338
  5. Patricia Flaherty, ANPPrimary Care Nurse Practitioner1215085840
  6. Robert Flaherty, M.D.Hospitalist Physician1528005238
  7. Siobhan Flaherty, NPFamily Nurse Practitioner1851974497
  8. Tina Flaherty, N.P.Acute Care Nurse Practitioner1437366101
  9. Natalie Flaim, DCChiropractor1861129140
  10. Melissa Flak, D.P.TPhysical Therapist1578640934
  11. Aine Flanagan, LICSWClinical Social Worker1689819377
  12. Frances Flanagan, M.DPediatric Pulmonology Physician1225481039
  13. Hugh Flanagan, MDAnesthesiology Physician1255363206
  14. Jane Flanagan, PHD, APRN, BCAdult Health Nurse Practitioner1174749261
  15. Jenna Flanagan, MDObstetrics & Gynecology Physician1598185035
  16. Kelly Flanagan, RD LDNRegistered Dietitian1740824531
  17. Kerin Flanagan, FNPFamily Nurse Practitioner1356624217
  18. Lillian Flanagan, PAMedical Physician Assistant1679987226
  19. Monica Flanagan, NPRegistered Nurse1568571776
  20. Patricia Flanagan, NPAdult Health Nurse Practitioner1891937371
  21. Ryan Flanagan, MDGastroenterology Physician1306374178
  22. Timothy Flanagan, MDAnesthesiology Physician1609368166
  23. Aisling Flanagan-Hickey, NPFamily Nurse Practitioner1851426357
  24. Erin Flanagin, M.D.Internal Medicine Physician1144670753
  25. Karen Flanders, N.P.Nurse Practitioner1972835932
  26. Elizabeth Flanigan, M.D., M.P.H.Neonatal-Perinatal Medicine Physician1619057577
  27. Colin Flannelly, MD, MSCPulmonary Disease Physician1255062675
  28. Kristen FlanneryStudent in an Organized Health Care Education/Training Program1992313316
  29. Michele Flannery, PA-CPhysician Assistant1417406166
  30. Karl Flanzer, DMDGeneral Practice Dentistry1215439021
  31. Bess Flashner, MDPulmonary Disease Physician1588044382
  32. Nichole Flaspohler, PHARMDAmbulatory Care Pharmacist1891468344
  33. Amy Flaster, M.D.Internal Medicine Physician1366880502
  34. Sarah FlatinClinical Social Worker1134646730
  35. Rachael Flatt, PHDClinical Psychologist1164396305
  36. Russell Flatto, M.D.Anesthesiology Physician1225198070
  37. Robert Flaumenhaft, M.D.Internal Medicine Physician1508813973
  38. Carol Flavell, APRN-BCAdult Health Nurse Practitioner1376649244
  39. Libby FlavinMental Health Counselor1538702790
  40. Lila Flavin, MDAddiction Medicine (Psychiatry & Neurology) Physician1508421504
  41. Patricia Fleck, NNP-BCNeonatal Nurse Practitioner1346489150
  42. Eric Fleegler, MD, MPHPediatric Emergency Medicine (Pediatrics) Physician1215923362
  43. Sarah Fleet, MDPediatric Gastroenterology Physician1467742486
  44. Eduardo FleischerStudent in an Organized Health Care Education/Training Program1356979728
  45. Amy Fleischman, MDPediatric Endocrinology Physician1992880744
  46. Jan Fleischman, MSN, RN, APN, BCNurse Practitioner1144320912
  47. Katie Fleischman, PH.D.Clinical Psychologist1639421498
  48. Katharine Fleischmann, MDAnesthesiology Physician1578542544
  49. Kristin Fleischmann-Rose, N.P.Adult Health Nurse Practitioner1710308218
  50. Gary Fleisher, MDEmergency Medicine Physician1952369696

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.