NPPES file of Aug 9, 2026

Doctors and health care providers in Worcester, MA

13,166 individual NPPES records list a practice address in Worcester, 2nd of 406 Massachusetts cities. The largest group is behavior technician: 1,487, 11% of the city's records, against 5% across Massachusetts. Page 178 of 264.

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

The 8 largest groups in Worcester

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

Worcester in Massachusetts

  • Rank in Massachusetts2nd of 406 cities by records
  • Share of the state6% of Massachusetts's records
  • Specialties present25 or more taxonomy codes
  • Top three groups26.2% of all records
  • Behavior Technician rank2nd of the 10 Massachusetts cities with the most

Compared with Massachusetts as a whole, Worcester has 2.4× the state's share of nurse practitioner records and 0.52× its share of physical therapist records.

Providers in Worcester, alphabetically

  1. Christopher O'Neil, MDStudent in an Organized Health Care Education/Training Program1992558258
  2. Emily O'Neil, OTROccupational Therapist1780436535
  3. Ryan O'NeilBehavior Technician1780276642
  4. Samantha O'Neil, PA-CPhysician Assistant1659948362
  5. Maureen O'Neil-Orcutt, M.S. OTRLSpecialist1033232905
  6. Jessica O'Neill, LCSWSocial Worker1538052667
  7. Joanna O'NeillDevelopmental Therapist1184029068
  8. Kaylyn O'Neill, OTR/LOccupational Therapist1154966406
  9. Rachael O'Neill, LMHCMental Health Counselor1962020222
  10. Shawna O'NeillCounselor1881265981
  11. Deirdre O'Reilly, MD, MPHNeonatal-Perinatal Medicine Physician1548250350
  12. Mary Linda O'Reilly, NPNurse Practitioner1043271455
  13. Ellen O'Rourke, LIC. AC.Nurse Practitioner1972767135
  14. Gregory O'Rourke, M.A.Mental Health Counselor1316353964
  15. Megan O'RourkeSocial Worker1427307248
  16. Michelle O'Rourke, NPNurse Practitioner1073574927
  17. Nancy O'Rourke, NPNurse Practitioner1366443418
  18. Carol O'Shea, OTROccupational Therapist1760695803
  19. Colleen O'Shea, L.M.H.C.Mental Health Counselor1700023140
  20. James O'Shea, M.D.Medical Oncology Physician1962564153
  21. Michael O'Shea, M.D.Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician1164481404
  22. Sheila O'Shea, PAPhysician Assistant1255635751
  23. Erin O'Shea Paudel, D.O.Pulmonary Disease Physician1033472352
  24. Sorcha O'Sullivan-Murphy, NPNurse Practitioner1245565829
  25. Laura O'Tell, M.A.Mental Health Counselor1538295365
  26. Robyn O'Toole, LICSWClinical Social Worker1326381138
  27. Lina Obando, LMHCMental Health Counselor1881843837
  28. Katrina Obarski, PTAPhysical Therapy Assistant1548789555
  29. Onyekachi ObekeBehavior Technician1851858898
  30. Ademola Obele, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1134755028
  31. Denise ObengProsthetics Case Management1871105544
  32. Lisa Obeng, RNHome Health Registered Nurse1609243914
  33. Nicholas Obeng, RNRegistered Nurse1780316059
  34. Victoria ObengMental Health Counselor1205511300
  35. Anjali Oberoi, MD, MPHStudent in an Organized Health Care Education/Training Program1730884057
  36. Neeru Oberoi, M.D.Anesthesiology Physician1679632806
  37. Kiely ObertBehavior Analyst1023626660
  38. Chinasa Obijiaku, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1942092309
  39. Ezinne ObijiakuPsychiatric/Mental Health Nurse Practitioner1154114148
  40. Owen OboiteInternal Medicine Physician1467941245
  41. Julia ObryckiBehavior Technician1598579963
  42. Kelly Ocallahan, M.D.Gastroenterology Physician1427056795
  43. Mohamad Och, M.D.Psychiatry Physician1629098496
  44. Jonathan Ochab, DMDGeneral Practice Dentistry1144357344
  45. Gabriel Ochoa, GENERAL DENTISTRYDentist1386655744
  46. Judith Ockene, PH.D.Clinical Psychologist1528032810
  47. Joyce OconnellBehavior Technician1033888045
  48. Melissa OconnellBehavior Analyst1548937055
  49. Kevin Oconner, PH.D.Clinical Social Worker1831219005
  50. Denise OconnorOccupational Therapy Assistant1689087108

The largest Massachusetts cities

  1. Boston41,865
  2. Springfield8,553
  3. Cambridge5,145
  4. Brockton4,287
  5. Milford3,459

All of Massachusetts →

How to read this directory

Worcester, Massachusetts appears in the CMS National Plan and Provider Enumeration System with 13,166 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 Worcester - 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 Worcester 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 Worcester is weighted toward Behavior Technician (1,487 clinicians, followed by Student in an Organized Health Care Education/Training Program with 1,031 and Mental Health Counselor with 929). 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, Worcester reports roughly 188 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.

For Worcester 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 Worcester, MA?

There are 13,166 registered healthcare providers in Worcester, MA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Worcester?

The most common specialties in Worcester are Behavior Technician, Student in an Organized Health Care Education/Training Program, Mental Health Counselor, Developmental Therapist, Clinical Social Worker. Behavior Technician has the most providers with 1,487.

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.