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 449 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. Jennifer Lo, M.D.Family Medicine Physician1508947748
  2. Jennifer Lo, MD, PHDDermatology Physician1427542109
  3. Kevin Bryan Lo, M.D.,Internal Medicine Physician1225480916
  4. Kristine Lo, M.D.Ophthalmology Physician1235368952
  5. Mindy Lo, M.D., PH.D.Pediatric Rheumatology Physician1528226271
  6. Ming LoPharmacist1659975977
  7. Shan Lo, DMDPublic Health Dentistry1376061838
  8. Stephen LoPsychologist1851030944
  9. Summer LoPhysical Therapist1528828977
  10. Wai-Kit Lo, MDGastroenterology Physician1043347404
  11. Yu-Ching LoClinical Social Worker1528806833
  12. Nicole Loan, ODOptometrist1528950847
  13. Katherine Lobben, PA-CPhysician Assistant1275092736
  14. Heather LobdellBehavior Technician1003375809
  15. Adriana LoboMental Health Counselor1083106512
  16. Catherine Lobo Galo, NPFamily Nurse Practitioner1477219459
  17. Jessika Loboda, NP-BCFamily Nurse Practitioner1306579263
  18. Michael Lobritz, M.D, PH.D.Infectious Disease Physician1003122540
  19. Emefah LoccohStudent in an Organized Health Care Education/Training Program1275111627
  20. Ashley Lochelt, L.I.C.S.W.Clinical Social Worker1811336316
  21. Paul Lochhead, MBCHBGastroenterology Physician1396194411
  22. Lorena Loci, NPGerontology Nurse Practitioner1558808691
  23. James Lock, MDPediatric Cardiology Physician1396736781
  24. Andrew Locke, M.D.Clinical Cardiac Electrophysiology Physician1922445055
  25. Christopher Locke, DPMFoot Surgery Podiatrist1609837723
  26. Emma Louise Locke, AGACNPCritical Care Medicine Nurse Practitioner1417673203
  27. Jared Locke, ATSStudent in an Organized Health Care Education/Training Program1356932560
  28. Rebecca Locke, MDPediatrics Physician1730355025
  29. Sara LockeStudent in an Organized Health Care Education/Training Program1477491843
  30. Patrick Lockett, DMDStudent in an Organized Health Care Education/Training Program1922844984
  31. Kaitlin Lockhart, AGNP-CNurse Practitioner1881199495
  32. Shahin Lockman, MDInfectious Disease Physician1629175229
  33. Brianna LocurtoPhysician Assistant1760099485
  34. Massimo Loda, MDClinical Pathology/Laboratory Medicine Physician1245306695
  35. Tobias Loddenkemper, MDNeurology with Special Qualifications in Child Neurology Physician1922272350
  36. Elizabeth Loder, MDInternal Medicine Physician1881684157
  37. Roshan LodhaStudent in an Organized Health Care Education/Training Program1417895632
  38. Nayna Lodhia, M.D.Gastroenterology Physician1205240314
  39. Laura LodoloEmergency Medicine Physician1255036976
  40. Maren LoeNeurological Surgery Physician1275361396
  41. Frances LoebClinical Social Worker1265114839
  42. Amanda Loerinc Guinyard, PH.D.Clinical Psychologist1134522055
  43. Cathy Loesch, LICSWClinical Social Worker1154093888
  44. Mark Loesch, PH.D.Psychologist1215357587
  45. Jennifer LoewDevelopmental Therapist1174183495
  46. Amanda LoewenRegistered Nurse1003762428
  47. John Loewenstein, M.D.Ophthalmology Physician1912997099
  48. Julia Loewenthal, M.D.Geriatric Medicine (Internal Medicine) Physician1841671013
  49. Brigid Loftus, PAPhysician Assistant1346131273
  50. Beth Logan, PHDClinical Child & Adolescent Psychologist1164831632

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.