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 68 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. Mariana Rosales, RNAmbulatory Care Registered Nurse1679285373
  2. Marlenne Rosales, LCSWClinical Social Worker1538694534
  3. Nora Rosales, BCBABehavior Technician1508542226
  4. Alexis Rosales GarciaLicensed Vocational Nurse1962268482
  5. Dana RoseMental Health Counselor1538288808
  6. Keenan RoseRehabilitation Practitioner1396906137
  7. Jodi Rosen, RN, IBCLCCommunity Health Registered Nurse1134541824
  8. Marie RosenbergBehavior Technician1104617844
  9. Marvin Ross, M.D.Internal Medicine Physician1659408227
  10. Meon RossRehabilitation Practitioner1538532965
  11. Ryan RossClinical Social Worker1407261100
  12. Tina Ross, LMFTMarriage & Family Therapist1932726585
  13. Nkeya Ross-McKinneyDoula1386584662
  14. Ramina May Kristin Rotol, PTPhysical Therapist1871397117
  15. Karen Rowe, MA, MFTIMarriage & Family Therapist1629345699
  16. Erica Rowland VassellCase Manager/Care Coordinator1760134688
  17. Dana Rowland-WalkerStudent in an Organized Health Care Education/Training Program1760980031
  18. Dessielyn Roxas, NPFamily Nurse Practitioner1255042180
  19. Brian RoyLicensed Vocational Nurse1679184949
  20. Maria Cecilia RoyoDental Assistant1306213806
  21. Rebecca Rozenberg, FNPFamily Nurse Practitioner1346891827
  22. Audrey RubioDay Training/Habilitation Specialist1124961255
  23. Kayla RueCommunity Health Worker1043043789
  24. Shavannah Rugley, LVNLicensed Vocational Nurse1437532355
  25. Ingrid Ruiz, MSWClinical Social Worker1306490834
  26. Miranda RuizProfessional Counselor1932950185
  27. Norma RuizClinical Social Worker1265024335
  28. Racquel RuizCase Manager/Care Coordinator1417790312
  29. Renee Ruiz, RNAdult Psychiatric/Mental Health Registered Nurse1053803908
  30. Ruben RuizAddiction (Substance Use Disorder) Counselor1124631130
  31. Uriah RuizBehavior Technician1528716347
  32. Zuleima Ruiz JimenezBehavior Technician1063062172
  33. Reyna Ruiz NunezCommunity Health Worker1831951847
  34. Aaron Ruiz ZunigaMarriage & Family Therapist1447961099
  35. Kelli Rule, PSY.DClinical Psychologist1538568134
  36. Latisa RushProfessional Counselor1821363748
  37. Keosha RussellBehavior Technician1770275745
  38. Raquel RussellRegistered Dietitian1558696898
  39. Renita RussellRehabilitation Practitioner1164680930
  40. Natalia Rychtarczyk, ODOptometrist1881574408
  41. Julie SaavedraPeer Specialist1588421820
  42. Martha SaavedraClinical Social Worker1487963435
  43. Jessica SabidoSpeech-Language Pathologist1902733819
  44. Anthony Sablan, PHARMDPharmacist1871255034
  45. Bjorn Sack, DCChiropractor1700095262
  46. Kari Saenz, PHDPsychologist1831508118
  47. Jatoi SaffordAddiction (Substance Use Disorder) Counselor1184931206
  48. Tanner SafirPharmacist1609487289
  49. Primo SaglioccoRehabilitation Practitioner1477970077
  50. Jasdeep Sagoo, DDSGeneral Practice Dentistry1588719793

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.