NPPES file of Aug 9, 2026

Doctors and health care providers in Eureka, CA

2,854 individual NPPES records list a practice address in Eureka, 79th of 812 California cities. The largest group is case manager/care coordinator: 492, 17% of the city's records, against 2% across California. Page 38 of 58.

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

Eureka in California

  • Rank in California79th of 812 cities by records
  • Share of the state0.3% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups30.3% of all records
  • Case Manager/Care Coordinator rank10th of the 10 California cities with the most

Compared with California as a whole, Eureka has 27.3× the state's share of psychiatric/mental health registered nurse records and 0.15× its share of behavior technician records.

Providers in Eureka, alphabetically

  1. Kathryn O'Malley, RN FNPCommunity Health/Public Health Clinical Nurse Specialist1952845596
  2. Chester O'NealCase Manager/Care Coordinator1265831333
  3. Shannan O'NealCounselor1952757957
  4. Julie O'NealeDay Training/Habilitation Specialist1699660621
  5. Solo O'NeillDay Training/Habilitation Specialist1952235145
  6. Judah O'Shaughnessy, RNRegistered Nurse1053199901
  7. Karen O'Shell, LCSWClinical Social Worker1104954353
  8. Colleen O'SullivanSchool Counselor1649082025
  9. Joshua Oakes, NPNurse Practitioner1831969856
  10. Iredia OdigiePsychiatric/Mental Health Registered Nurse1811840697
  11. Karen OethCase Manager/Care Coordinator1801260153
  12. Rhonda Oeth, CPSSPeer Specialist1528538907
  13. James OgareyPersonal Care Attendant1588353601
  14. Steven OgareyCase Manager/Care Coordinator1992276943
  15. Katie OgleCase Manager/Care Coordinator1962809046
  16. Omowonuola OgunwalePsychiatric/Mental Health Registered Nurse1093292054
  17. Lisa Okeefe, LCSWClinical Social Worker1801317052
  18. Gift Okwandu, NPFamily Nurse Practitioner1104434364
  19. Bonnie OlanMental Health Counselor1891985297
  20. Jonathan OliverCase Manager/Care Coordinator1144702788
  21. Lillian OliverCommunity Health Worker1699290023
  22. Alisha OlmoSpeech-Language Pathologist1790526713
  23. Gaylynn Olsen, RNPsychiatric/Mental Health Registered Nurse1285889469
  24. Marcelle Olsen, MFTMarriage & Family Therapist1740492263
  25. Edward Olsgard, MDSpecialist1689617482
  26. Carmen Olson, B.A.Specialist1245366533
  27. Launa Olson, MAMarriage & Family Therapist1720251168
  28. Angela OlvedaCase Manager/Care Coordinator1548617202
  29. Jon Omey, DDSGeneral Practice Dentistry1801806708
  30. Luke Omey, D.D.S.Dentist1154620102
  31. Loran Ong, DDSDentist1033718978
  32. Cleopatra Onyia, LPNLicensed Vocational Nurse1215618533
  33. Leslie OrozcoBehavior Technician1114534229
  34. Citlali Orozco VielmaBehavior Technician1154996239
  35. Lisa Orr, RNRegistered Nurse1275119497
  36. Bryan OrtegaRehabilitation Practitioner1083437727
  37. Delana OrtegaCase Manager/Care Coordinator1285024562
  38. Jim OsbornCommunity Health Worker1568881738
  39. Janese Osborne, RD, CDERegistered Dietitian1508958877
  40. Michael Osborne, PHYSICAL THERAPYSpecialist1649202409
  41. Zayah OsborneHealth & Wellness Coach1770451908
  42. Maria Oseguera-WrightCase Manager/Care Coordinator1982367694
  43. Nanette OsoroPsychiatric/Mental Health Registered Nurse1164814968
  44. Margaret Otey, R.N.Child & Adolescent Psychiatric/Mental Health Registered Nurse1154464774
  45. Courtney OttoSchool Counselor1871460766
  46. Lisa OverholtAddiction (Substance Use Disorder) Counselor1871039974
  47. Amiyah OwenMarriage & Family Therapist1154990372
  48. Charles OwensCase Manager/Care Coordinator1376918565
  49. Anna Owings-HeidrickCounselor1932355781
  50. Leah OzeroffCase Manager/Care Coordinator1881850964

The largest California cities

  1. Los Angeles69,537
  2. San Diego52,937
  3. San Francisco38,143
  4. Sacramento33,083
  5. San Jose20,925

All of California →

How to read this directory

Eureka, California appears in the CMS National Plan and Provider Enumeration System with 2,854 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 Eureka - 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 Eureka 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 Eureka is weighted toward Case Manager/Care Coordinator (492 clinicians, followed by Psychiatric/Mental Health Registered Nurse with 206 and Marriage & Family Therapist with 167). 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 California's population, Eureka reports roughly 7.3 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 California's most common specialties, Behavior Analyst is the most prominent one with no provider currently listing a Eureka practice address, a coverage gap Eureka patients typically fill by traveling to a larger nearby hub.

For Eureka 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 Eureka, CA?

There are 2,854 registered healthcare providers in Eureka, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Eureka?

The most common specialties in Eureka are Case Manager/Care Coordinator, Psychiatric/Mental Health Registered Nurse, Marriage & Family Therapist, Clinical Social Worker, Registered Nurse. Case Manager/Care Coordinator has the most providers with 492.

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.