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 177 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. Katie O'Brien, NPDermatology Physician1801048921
  2. Kaylee O'BrienBehavior Analyst1043180912
  3. Kaylin O'Brien, MS, GCGenetic Counselor (M.S.)1336622661
  4. Lauren O'Brien, PASurgical Physician Assistant1447897020
  5. Maryellen O'Brien, LMHCMental Health Counselor1902284458
  6. Sarah O'Brien, FNPNurse Practitioner1558694760
  7. Elizabeth O'Callahan, LMHC, BCBA, LABAMental Health Counselor1548531916
  8. Taylin O'Coin, MACounselor1073033932
  9. George O'ConnellMental Health Counselor1932632320
  10. Lauren O'Connell, ACNP-BCNurse Practitioner1811120603
  11. Megan O'ConnellBehavior Technician1760260194
  12. Trisha O'Connell, LMHCMental Health Counselor1376741637
  13. Chelsey O'ConnorCounselor1164082954
  14. Colette O'Connor, ACNPC-AGNurse Practitioner1003653700
  15. Diane O'Connor, R.N.Registered Nurse1578847711
  16. Isabella O'ConnorBehavior Technician1710578794
  17. Jennifer O'ConnorDevelopmental Therapist1083165427
  18. Jessica O'ConnorOccupational Therapist1902344138
  19. John O'Connor, M.D.Anesthesiology Physician1295988921
  20. June O'Connor, M.D.Obstetrics & Gynecology Physician1336130657
  21. Katie O'ConnorDevelopmental Therapist1457883597
  22. Kerry O'Connor, N.P.Adult Health Nurse Practitioner1548451156
  23. Kristen O'ConnorAudiologist1104952365
  24. Laurel O'Connor, MDEmergency Medicine Physician1982099883
  25. Margret O'Connor, CNPFamily Nurse Practitioner1114887460
  26. Mark O'Connor, M.D.Endocrinology, Diabetes & Metabolism Physician1518300284
  27. Samantha O'ConnorDevelopmental Therapist1487174413
  28. Sean O'ConnorBehavior Technician1033999313
  29. Daniel O'Day, D.C.Orthopedic Chiropractor1386667079
  30. Kevin O'Day, M.D.Cardiovascular Disease Physician1255793220
  31. Katharine O'Dell, NPNurse Practitioner1144201195
  32. Phylicia O'Dell, BSWSocial Worker1598483877
  33. Mary O'Donnell, OTR/LOccupational Therapist1609380765
  34. Patrick O'Donnell, DOAnatomic Pathology Physician1942415294
  35. Richard O'Garr, M.A.Mental Health Counselor1982749636
  36. Cynthia O'GradyBehavior Technician1093384612
  37. John O'Grady, PA-CPhysician Assistant1083689020
  38. Erin O'Hearn, MSW, LICSWClinical Social Worker1225166887
  39. Lauryn O'Keefe, DPTPhysical Therapist1437758166
  40. Erin O'Kula, MDEmergency Medicine Physician1154732352
  41. Alicia O'Leary, LMHCMental Health Counselor1134554082
  42. Kathleen O'Leary, O.D.Optometrist1790072650
  43. Madeleine O'Leary, MDStudent in an Organized Health Care Education/Training Program1467193417
  44. Maureen O'Leary, MAMental Health Counselor1285013946
  45. Melanie O'Leary, B.SCognitive & Behavioral Psychologist1437421971
  46. Jennifer O'Leary Tait, PH.D.Clinical Psychologist1982845061
  47. Caitlin O'LoughlinCertified Registered Nurse Anesthetist1649734484
  48. Rosemary O'Malley-CannOccupational Therapist1871620195
  49. Anna O'Neal, CNPNurse Practitioner1346789997
  50. Lynn O'Neal, NPNurse Practitioner1841251261

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.