NPPES file of Aug 9, 2026

Doctors and health care providers in New Haven, CT

9,793 individual NPPES records list a practice address in New Haven, 1st of 200 Connecticut cities. The largest group is students in training: 1,845, 19% of the city's records, against 6% across Connecticut. Page 131 of 196.

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

The 8 largest groups in New Haven

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

New Haven in Connecticut

  • Rank in Connecticut1st of 200 cities by records
  • Share of the state11.6% of Connecticut's records
  • Specialties present25 or more taxonomy codes
  • Top three groups27.9% of all records
  • Students in training rank1st of the 10 Connecticut cities with the most

Compared with Connecticut as a whole, New Haven has 4.2× the state's share of pharmacist clinician (phc)/ clinical pharmacy specialist records and 0.36× its share of mental health counselor records.

Providers in New Haven, alphabetically

  1. Karin Nystrom, APRNClinical Nurse Specialist1710978275
  2. Dia O'Brien, APRNPsychiatric/Mental Health Nurse Practitioner1750168951
  3. Matthew O'Brien, MDPediatric Cardiology Physician1790304137
  4. Michael O'Brien, M.D.Surgery Physician1730107061
  5. Samuel O'BrienStudent in an Organized Health Care Education/Training Program1780373183
  6. Yvonne O'Brien, LICSWClinical Social Worker1487043063
  7. Arlene O'Callahan, LPNLicensed Practical Nurse1215367040
  8. Ciara O'Connell, MDStudent in an Organized Health Care Education/Training Program1285485847
  9. Lucy O'Connell, C.N.M., W.H.N.P, R.NAdvanced Practice Midwife1932426756
  10. Margaret O'Connell, LCSWClinical Social Worker1205767266
  11. Matthew O'Connell, PHARMDPharmacist1336757319
  12. Rowan O'Connell-Barger, APRNWomen's Health Nurse Practitioner1245906890
  13. Leslie O'Connor, APRN, BCAdult Psychiatric/Mental Health Clinical Nurse Specialist1750495610
  14. Meghan O'ConnorPhysician Assistant1194673988
  15. Peggy O'Connor, P.A.Physician Assistant1831344902
  16. Sean O'ConnorStudent in an Organized Health Care Education/Training Program1043715469
  17. Sean O'ConnorStudent in an Organized Health Care Education/Training Program1841827292
  18. Zachary O'Connor, PHARMDPharmacist1447189188
  19. Matthew O'Dea, B.ACounselor1376844423
  20. Ryan O'Dell, M.D./PH.D.Psychiatry Physician1245761519
  21. Katherine O'Donnell, LCSWClinical Social Worker1174954184
  22. Julia O'Donoghue, MDStudent in an Organized Health Care Education/Training Program1316688021
  23. Alexander O'Donovan, MD, MEDPediatrics Physician1467196352
  24. Christiana O'Hara, MS CCC-SLPSpeech-Language Pathologist1326652108
  25. Kevin O'Hara, PAMedical Physician Assistant1235463522
  26. Lena O'Keefe, M.D.Neurology Physician1184159618
  27. Liam O'MahonyMarriage & Family Therapist1043932650
  28. Alana O'MalleyPsychologist1952700924
  29. Brian O'Neill, APRN, MSN, CCRN-CSCAdult Health Nurse Practitioner1821011396
  30. Kaelan O'NeillRegistered Dietitian1568327112
  31. Donal Mor O'Sullivan, MDStudent in an Organized Health Care Education/Training Program1558207415
  32. Monika O'TooleRegistered Nurse1134486541
  33. Hannah Oakland, MDPulmonary Disease Physician1952798852
  34. Naseem ObaydouSocial Worker1306416615
  35. Kinan Obeidat, MDHospitalist Physician1992411664
  36. Tracey ObergDental Hygienist1285010504
  37. Crystal Obiozor, M.D.Psychiatry Physician1811422645
  38. Victor Oboli, MDPediatrics Physician1437822996
  39. Tomasz Obrzut, M.D.Emergency Medicine Physician1275761819
  40. Anaika OcasioMassage Therapist1629726898
  41. Luzdali Ocasio-Serrano, LPCProfessional Counselor1366220618
  42. Jillian Ochoa Allemant, RDNRegistered Dietitian1669138285
  43. Cassius Iyad Ochoa Chaar, M.D., M.S.Vascular Surgery Physician1669600698
  44. Mario Ochoa Prieto, M.D.Internal Medicine Physician1407206295
  45. Katelyn Oconnor, PA-CPhysician Assistant1265733083
  46. Patrick Oconnor, MDInternal Medicine Physician1689657819
  47. Amanda Ocran, MDPediatrics Physician1114454154
  48. Joseph OcranMental Health Counselor1255015400
  49. Natalija Odanovic, M.D.Student in an Organized Health Care Education/Training Program1548645328
  50. Christine Odell, MD, MPHPediatrics Physician1255313813

The largest Connecticut cities

  1. Hartford6,317
  2. Waterbury3,148
  3. Farmington2,993
  4. Bridgeport2,980
  5. Stamford2,774

All of Connecticut →

How to read this directory

New Haven, Connecticut appears in the CMS National Plan and Provider Enumeration System with 9,793 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 New Haven - 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 New Haven 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 New Haven is weighted toward Student in an Organized Health Care Education/Training Program (1,845 clinicians, followed by Clinical Social Worker with 556 and Internal Medicine Physician with 329). 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 Connecticut's population, New Haven reports roughly 270.7 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 Connecticut's most common specialties, Physical Therapist is the most prominent one with no provider currently listing a New Haven practice address, a coverage gap New Haven patients typically fill by traveling to a larger nearby hub.

For New Haven 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 New Haven, CT?

There are 9,793 registered healthcare providers in New Haven, CT, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in New Haven?

The most common specialties in New Haven are Student in an Organized Health Care Education/Training Program, Clinical Social Worker, Internal Medicine Physician, Psychiatry Physician, Pharmacist. Student in an Organized Health Care Education/Training Program has the most providers with 1,845.

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.