NPPES file of Aug 9, 2026

Doctors and health care providers in Lancaster, CA

4,273 individual NPPES records list a practice address in Lancaster, 49th of 812 California cities. The largest group is behavior technician: 436, 10% of the city's records, against 18% across California. Page 57 of 86.

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

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Lancaster in California

  • Rank in California49th of 812 cities by records
  • Share of the state0.4% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups24.6% of all records

Compared with California as a whole, Lancaster has 4.5× the state's share of peer specialist records and 0.56× its share of physical therapist records.

Providers in Lancaster, alphabetically

  1. Hong-Diep Nguyen, PHARM.D.Pharmacotherapy Pharmacist1245300599
  2. Kyle NguyenGeneral Practice Dentistry1245892488
  3. Raymond Nguyen, M.D.Anesthesiology Physician1316149511
  4. Tam NguyenSpeech-Language Pathologist1265354187
  5. Tien NguyenPharmacist1841734159
  6. Trung Nguyen, O.D.Optometrist1548572340
  7. Richard Nicholson, RNDiabetes Educator Registered Nurse1659128411
  8. Harry Nickle, M.D.Infectious Disease Physician1144356460
  9. Brenda NietoAmbulatory Care Registered Nurse1053288423
  10. Rene NievesRegistered Nurse1407625379
  11. Aki Niihara, M.D.Obstetrics & Gynecology Physician1114286952
  12. Sheryl Nim, OTR/LOccupational Therapist1477480408
  13. Caitlyn NixBehavior Technician1740749001
  14. Flora NkwochaRegistered Nurse1699640862
  15. Jovita Nnoham, PHARMD, RPHPharmacist1114886942
  16. Martins NnohamStudent in an Organized Health Care Education/Training Program1235407644
  17. Alexandra NoelBehavior Analyst1710612932
  18. Arthur NoraMarriage & Family Therapist1417300245
  19. Veronica NoraBehavior Technician1295680148
  20. Amber NordmanLicensed Practical Nurse1952106510
  21. Kenia NoriegaClinical Social Worker1194007104
  22. Susan NoriegaAddiction (Substance Use Disorder) Counselor1689208126
  23. Atavia NormanCase Manager/Care Coordinator1093209702
  24. Michael Norris, DCChiropractor1780755264
  25. Robriana Northern, MEDICAL BILLINGResearch Study Abstracter/Coder1689433443
  26. Ebony NorvilleDay Training/Habilitation Specialist1568665743
  27. Rowena Nova, COTA/LOccupational Therapy Assistant1831588755
  28. Naomi NovakMarriage & Family Therapist1194856708
  29. Wendy Novoa RamirezLicensed Vocational Nurse1972374635
  30. Destinee NunezBehavior Technician1245948934
  31. Evelyn NunezClinical Social Worker1548973084
  32. Felicia NunezRehabilitation Practitioner1659607059
  33. Florencia NunezBehavior Technician1730640616
  34. Gloria NunezRehabilitation Practitioner1417144585
  35. Rhoda Nunn, REGISTERED NURSEAmbulatory Care Registered Nurse1750811097
  36. Jaime NunnenkampClinical Social Worker1033439625
  37. Salvador NunoAddiction (Substance Use Disorder) Counselor1578815791
  38. Furqan Nusair, MDPsychiatry Physician1548692809
  39. Uchechi Nwachuku, PHARM DPharmacist1467941757
  40. Gloria Nwigwe, FNPFamily Nurse Practitioner1265142806
  41. Sandra NygaardAddiction (Substance Use Disorder) Counselor1558729764
  42. Shannon O'Brien, LCSWClinical Social Worker1962088062
  43. Angela O'SullivanRehabilitation Practitioner1699192609
  44. Eric Oak, PHARM.D.Pharmacist1033455811
  45. Hilda Obispo, RBTBehavior Technician1720812233
  46. Ellen Obrien, M.A., MFTMarriage & Family Therapist1427189430
  47. Adriana Ocampo, PSY.D, LCSWStudent in an Organized Health Care Education/Training Program1760080709
  48. Deanna OcampoBehavior Technician1699463216
  49. Anabelle Ochoa, PSYDStudent in an Organized Health Care Education/Training Program1336628700
  50. Daisy OchoaRespiratory/Developmental/Rehabilitative Specialist/Technologist1144863259

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

Lancaster, California appears in the CMS National Plan and Provider Enumeration System with 4,273 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 Lancaster - 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 Lancaster 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 Lancaster is weighted toward Behavior Technician (436 clinicians, followed by Marriage & Family Therapist with 331 and Addiction (Substance Use Disorder) Counselor with 283). 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, Lancaster reports roughly 11 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 Lancaster 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 Lancaster, CA?

There are 4,273 registered healthcare providers in Lancaster, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Lancaster?

The most common specialties in Lancaster are Behavior Technician, Marriage & Family Therapist, Addiction (Substance Use Disorder) Counselor, Case Manager/Care Coordinator, Clinical Social Worker. Behavior Technician has the most providers with 436.

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.