NPPES file of Aug 9, 2026

Doctors and health care providers in Grass Valley, CA

1,540 individual NPPES records list a practice address in Grass Valley, 142nd of 812 California cities. The largest group is mental health counselor: 151, 10% of the city's records, against 3% across California. Page 21 of 31.

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

Grass Valley in California

  • Rank in California142nd of 812 cities by records
  • Share of the state0.2% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups28.2% of all records

Compared with California as a whole, Grass Valley has 15.1× the state's share of adult companion records and 0.31× its share of student in an organized health care education/training program records.

Providers in Grass Valley, alphabetically

  1. Ashley NettlesCommunity Health Worker1689483356
  2. Christine Newsom, MDInternal Medicine Physician1407822943
  3. Huy Nguyen, D.O.Family Medicine Physician1467400853
  4. Michelle-Linh Nguyen, MDInternal Medicine Physician1114447596
  5. Phillip NguyenPharmacist1043661838
  6. Erin Nichol, DPTPhysical Therapist1568135291
  7. James Nichol, M.D.Family Medicine Physician1114924966
  8. Laura NichollsMarriage & Family Therapist1982739140
  9. Trevor Nichols, PA-CPhysician Assistant1588602833
  10. Patricia Niemeyer, M.D.Diagnostic Radiology Physician1548316565
  11. Shae NightngaleMental Health Counselor1932611928
  12. David NinoDay Training/Habilitation Specialist1861972044
  13. Christina NoackAddiction (Substance Use Disorder) Counselor1225495039
  14. Elizabeth NoackCase Manager/Care Coordinator1730943275
  15. Joy NocerinoMental Health Counselor1770881997
  16. Cassidy Noder, MACase Manager/Care Coordinator1104665777
  17. Daniella NogueraDoula1912867342
  18. M Norsell, PH.D.Clinical Psychologist1144256702
  19. Allison North, MS, PPSSchool Psychologist1134987803
  20. George NorwoodAddiction (Substance Use Disorder) Counselor1841669033
  21. Wesley NottCounselor1477873909
  22. Judy NunleyCounselor1306207493
  23. Malia O'BrienCounselor1366905671
  24. Brittany O'ConnorCounselor1598357725
  25. Julie O'LoughlinMental Health Counselor1972854420
  26. Brian O'QuinAddiction (Substance Use Disorder) Counselor1477413359
  27. Shannon O'SheaMental Health Counselor1760849285
  28. Richard Oberleitner, D.C.Chiropractor1710202767
  29. Michelle OconnorMental Health Counselor1114472040
  30. Zoe OdomPeer Specialist1437976396
  31. Abby OlinAddiction (Substance Use Disorder) Counselor1528325727
  32. Jennifer Oliphant, LCSWClinical Social Worker1962760660
  33. Marie Antoinette Olmos, CNPFamily Nurse Practitioner1861625386
  34. Alison Olsen, LADCAddiction (Substance Use Disorder) Counselor1801017280
  35. Robert Omogrosso, DOFamily Medicine Physician1902253610
  36. Marco OntiverosAdult Companion1609681451
  37. Robert OntiverosCounselor1013476712
  38. Danna OrovitzMental Health Counselor1699250456
  39. Claudia OrtizMental Health Counselor1376261172
  40. Sarah OrzalliMental Health Counselor1437519626
  41. Alison Osborn, LMMidwife1033241021
  42. Jessica OsbornCounselor1881219921
  43. Shannon Osborn, RNRegistered Nurse1598681207
  44. Kandis OsborneMental Health Counselor1780103960
  45. Virginia Osborne, NDNaturopath1275662520
  46. Erin Osiecki, MDEmergency Medicine Physician1336499789
  47. Lee Osnas, D.D.S.Endodontics1891874293
  48. Michelle OttenLicensed Vocational Nurse1255791109
  49. Maria PachecoAdult Companion1306974506
  50. Megan PageAdult Companion1285355602

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

Grass Valley, California appears in the CMS National Plan and Provider Enumeration System with 1,540 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 Grass Valley - 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 Grass Valley 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 Grass Valley is weighted toward Mental Health Counselor (151 clinicians, followed by Addiction (Substance Use Disorder) Counselor with 148 and Marriage & Family Therapist with 136). 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, Grass Valley reports roughly 4 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 Technician is the most prominent one with no provider currently listing a Grass Valley practice address, a coverage gap Grass Valley patients typically fill by traveling to a larger nearby hub.

For Grass Valley 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 Grass Valley, CA?

There are 1,540 registered healthcare providers in Grass Valley, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Grass Valley?

The most common specialties in Grass Valley are Mental Health Counselor, Addiction (Substance Use Disorder) Counselor, Marriage & Family Therapist, Counselor, Physical Therapist. Mental Health Counselor has the most providers with 151.

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.