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 397 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. Lisa KnittleDevelopmental Therapist1366152118
  2. Hailey KnoblochMental Health Counselor1467232157
  3. Kevin Knoblock, NPNurse Practitioner1710278726
  4. Birgit Knoechel, MDPediatric Hematology & Oncology Physician1245406404
  5. Emily KnoeppStudent in an Organized Health Care Education/Training Program1104436773
  6. Renata Knoll Binotti, MDStudent in an Organized Health Care Education/Training Program1518546621
  7. Adrienne Knopf, MDInternal Medicine Physician1760404883
  8. Julie Knopp, ANPAdult Health Nurse Practitioner1265670871
  9. John Knorp, M.D.Anesthesiology Physician1669530952
  10. Thomas KnorrEmergency Medicine Physician1477932911
  11. Jefferson Knott, PASurgical Physician Assistant1285615641
  12. Courtney Knotts, CRNACertified Registered Nurse Anesthetist1689388274
  13. Laura Knouse, PH.D.Student in an Organized Health Care Education/Training Program1760673719
  14. Stephen Knowlton, PHDClinical Psychologist1336291004
  15. Clayton Knox, MD, MBAInternal Medicine Physician1609003144
  16. Mark Knox, MB BCH BAOStudent in an Organized Health Care Education/Training Program1093061913
  17. Nicole KnudsenStudent in an Organized Health Care Education/Training Program1396546495
  18. Sonja Knudson, MDStudent in an Organized Health Care Education/Training Program1528916772
  19. Steven Knuesel, MDInternal Medicine Physician1760459689
  20. Mary Knust Graichen, NPFamily Nurse Practitioner1487750675
  21. Anders Knutzen, MDBody Imaging Physician1912985037
  22. Alan KoEmergency Medicine Physician1376990416
  23. April Tak Ko, PMHNPChild & Adolescent Psychiatric/Mental Health Registered Nurse1891419461
  24. Caroline Ko, DPTPhysical Therapist1518509660
  25. Catherine Ko, DPTPhysical Therapist1255533915
  26. Christine KoCardiology Pharmacist1801518287
  27. Da Mi KoRegistered Nurse1700730512
  28. Danielle Ko, MBBSInternal Medicine Physician1104144385
  29. Danny Ko, PHARM.DPharmacist1821681545
  30. Darae Ko, MDCardiovascular Disease Physician1336431147
  31. Donna KoPharmacist1265038897
  32. Eunji KoPharmacist1811850100
  33. Hui-Yuan Ko, D.D.S.Periodontics1770890659
  34. Kang Hoon KoStudent in an Organized Health Care Education/Training Program1215421219
  35. Naomi Ko, M.D.Medical Oncology Physician1043360928
  36. Narae Ko, MDOphthalmology Physician1649532276
  37. Phebe KoAnesthesiology Physician1356583389
  38. Vincent Ko, MDAnatomic Pathology & Clinical Pathology Physician1649246562
  39. Debbie Koay, PHARMDPharmacist1578032264
  40. Frances Koback, MDStudent in an Organized Health Care Education/Training Program1114875440
  41. Audrey Kobayashi, MD, PHDOrthopaedic Surgery Physician1598235509
  42. Ryan Kobayashi, MD, MSPediatric Cardiology Physician1215449830
  43. Yasuyuki Kobayashi, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1629848833
  44. Sara Kobielski, NPPediatric Nurse Practitioner1992538227
  45. Daly KobosAddiction (Substance Use Disorder) Counselor1083199582
  46. Edward Kobraei, M.D.Plastic Surgery Physician1750647863
  47. Jeremy Kobulnik, M.D.Cardiovascular Disease Physician1013342518
  48. Anna Kobzeva-Herzog, MDSurgery Physician1760019459
  49. Lester Kobzik, MDAnatomic Pathology Physician1326004516
  50. Rachelle Koch, MDInternal Medicine Physician1285259598

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.