NPPES file of Aug 9, 2026

Doctors and health care providers in Cambridge, MA

5,145 individual NPPES records list a practice address in Cambridge, 4th of 406 Massachusetts cities. The largest group is clinical social worker: 545, 11% of the city's records, against 8% across Massachusetts. Page 70 of 103.

CMS NPPES registry, file of Aug 9, 2026 · method · Verify with CMS →

The 8 largest groups in Cambridge

Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.

Cambridge in Massachusetts

  • Rank in Massachusetts4th of 406 cities by records
  • Share of the state2.3% of Massachusetts's records
  • Specialties present25 or more taxonomy codes
  • Top three groups22.6% of all records
  • Clinical Social Worker rank4th of the 10 Massachusetts cities with the most

Compared with Massachusetts as a whole, Cambridge has 4.1× the state's share of advanced practice midwife records and 0.56× its share of speech-language pathologist records.

Providers in Cambridge, alphabetically

  1. Alexandra O'Brien-Dukes, LMHCMental Health Counselor1952950420
  2. Denise O'Connor, RN,MS,OCNOncology Registered Nurse1356549034
  3. Robert O'Connor, M.D.Internal Medicine Physician1669768164
  4. Dylan O'DellBehavior Technician1982278495
  5. Amanda O'Donnell, DONephrology Physician1356839328
  6. Ryan O'Donnell, PT, DPTNeurology Physical Therapist1588540025
  7. Megan O'HaraSocial Worker1093123606
  8. Devin O'Hare, CCC-SLPSpeech-Language Pathologist1821659020
  9. Robert O'LoughlinSocial Worker1336519339
  10. Barbara O'Neil, M.D.Internal Medicine Physician1275565335
  11. Elizabeth O'Neil, CNPFamily Nurse Practitioner1811416563
  12. Heather O'Neill, MS, OTR/LOccupational Therapist1548594609
  13. Siobhan O'Neill, M.D.Psychiatry Physician1073571915
  14. Sarah O'ReillyOrthopedic Physical Therapist1952939357
  15. Michael O'Rourke, PA-CPhysician Assistant1629528435
  16. Olivia O'Shea, AGNP-CAdult Health Nurse Practitioner1114805116
  17. Kathryn Oas, AGNPPrimary Care Nurse Practitioner1184181380
  18. Jennifer ObeahonRegistered Nurse1821584434
  19. Dita Obler, MS, CGCGenetic Counselor (M.S.)1215994488
  20. Jennifer Obrien, PH.D.Psychologist1326607680
  21. Lynette Obrien, RN, OCN, BSNRegistered Nurse1164629960
  22. Ingrid ObsuthPsychologist1952566044
  23. Marissa OconnorCertified Registered Nurse Anesthetist1497271662
  24. Molly OconnorClinical Social Worker1508205303
  25. Marie OgandoRegistered Nurse1124508650
  26. Gianna Ogletree, RNRegistered Nurse1356222590
  27. Barbara Ogur, MDInternal Medicine Physician1356408751
  28. Jacqueline OhmuraStudent in an Organized Health Care Education/Training Program1164125563
  29. Andre Ohta GementeRegistered Nurse1720800295
  30. Abram Ojure, LIC.AC., DIPL. OMAcupuncturist1023316650
  31. Unoma Okoli, MBBSInternal Medicine Physician1952983306
  32. Kori Oladunjoye, PHARMDPharmacist1679423636
  33. Jane OldhamSocial Worker1265150932
  34. Jacqueline Olds, MDPsychiatry Physician1336139054
  35. Zachary Oliff, DOEmergency Medicine Physician1003300492
  36. Christine Oliver, LICSWSocial Worker1245453075
  37. Phoebe Oliverio, PHARM.D.Pharmacist1669831624
  38. Hannah Olivet, MDInternal Medicine Physician1750580197
  39. Alexandra OlivoRegistered Nurse1114563574
  40. Elizabeth OlsonClinical Social Worker1225513120
  41. Erin Omalley, CRNACertified Registered Nurse Anesthetist1467526111
  42. Joseph Omlor, MDInternal Medicine Physician1124432869
  43. Fernando Ona, PHD, MPHSocial Worker1982042784
  44. Alison Oneill, MDNeurology Physician1194715771
  45. Marla Onishi, MDFamily Medicine Physician1528071883
  46. Anthony Onorato, R.PH.Pharmacist1003940644
  47. Chibuikem OnwuoguAssistant Behavior Analyst1043196694
  48. Ebere OnyeadorAmbulatory Care Registered Nurse1770284838
  49. Adarema OparaPharmacist1861145476
  50. Frank Oppenheim, D.M.D., PH.D.Periodontics1770770422

The largest Massachusetts cities

  1. Boston41,865
  2. Worcester13,166
  3. Springfield8,553
  4. Brockton4,287
  5. Milford3,459

All of Massachusetts →

How to read this directory

Cambridge, Massachusetts appears in the CMS National Plan and Provider Enumeration System with 5,145 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 Cambridge - 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 Cambridge 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 Cambridge is weighted toward Clinical Social Worker (545 clinicians, followed by Student in an Organized Health Care Education/Training Program with 319 and Internal Medicine Physician with 300). 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, Cambridge reports roughly 73.5 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, Behavior Technician is the most prominent one with no provider currently listing a Cambridge practice address, a coverage gap Cambridge patients typically fill by traveling to a larger nearby hub.

For Cambridge 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 Cambridge, MA?

There are 5,145 registered healthcare providers in Cambridge, MA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Cambridge?

The most common specialties in Cambridge are Clinical Social Worker, Student in an Organized Health Care Education/Training Program, Internal Medicine Physician, Mental Health Counselor, Social Worker. Clinical Social Worker has the most providers with 545.

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.