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 66 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. Gabriela RinconPeer Specialist1306267679
  2. Jannette RinkenbergerRehabilitation Practitioner1902202997
  3. Fanta Ritchie, M.A.Marriage & Family Therapist1265753230
  4. Alex RivasAddiction (Substance Use Disorder) Counselor1144490699
  5. Desiree Rivas, RD, IBCLCRegistered Dietitian1316552995
  6. Diana RivasStudent in an Organized Health Care Education/Training Program1770114571
  7. Saraid RivasBehavior Technician1770280729
  8. Yolanda Rivas ColonRehabilitation Practitioner1255839213
  9. Oscar Rivas GuatemalaMarriage & Family Therapist1558625053
  10. Alvin RiveraAddiction (Substance Use Disorder) Counselor1760045850
  11. Janiah RiveraPeer Specialist1316418973
  12. Janis Rivera, MA, CCC-SLPSpeech-Language Pathologist1932524550
  13. Jennifer Rivera, M.A.Marriage & Family Therapist1063929586
  14. Juliana RiveraBehavior Technician1225597719
  15. Karen RiveraBehavior Technician1881236867
  16. Leticia RiveraCase Manager/Care Coordinator1336527720
  17. Lourdes RiveraStudent in an Organized Health Care Education/Training Program1306496310
  18. Robert RiveraCase Manager/Care Coordinator1093056616
  19. Victor RiveraCommunity Health Worker1477364008
  20. Zahriah RiveraBehavior Technician1558215335
  21. Christin RiversBehavior Technician1508308818
  22. Malik RiversAddiction (Substance Use Disorder) Counselor1275213233
  23. Annmarie RizzaAddiction (Substance Use Disorder) Counselor1275962722
  24. Katelyn RoaneCommunity Health Worker1023736238
  25. Marian Robbin, MFT-IMarriage & Family Therapist1528308665
  26. Angela RobersonCase Manager/Care Coordinator1750971305
  27. Daniel Roberts, RADT-1Addiction (Substance Use Disorder) Counselor1437850476
  28. Mia RobertsBehavior Technician1689392680
  29. Terica Roberts, M.A., M.F.T.I.Marriage & Family Therapist1922127257
  30. Chase Robertson, RNRegistered Nurse1235088873
  31. Lakisha RobertsonRespiratory/Developmental/Rehabilitative Specialist/Technologist1598308611
  32. Ernest Robies, MFT32946Marriage & Family Therapist1750404802
  33. Amber RobinsonBehavior Technician1841759677
  34. Ellen Robinson, LMFTMarriage & Family Therapist1275738155
  35. Jekora Robinson, CPSSPeer Specialist1255205852
  36. Lawrence Robinson, M.D.Allergy Physician1023037652
  37. Linda Robinson, NURSE PRACTITIONERWomen's Health Nurse Practitioner1942423553
  38. Marion RobinsonClinical Social Worker1699022996
  39. Solomon Robinson-PeckPeer Specialist1356031009
  40. John Robles, MSWClinical Social Worker1245372325
  41. Ester Robles Espinoza, AMFTMarriage & Family Therapist1124838727
  42. Charles Rocamboli, D.O.Adult Medicine Physician1366639049
  43. Diana RochaAddiction (Substance Use Disorder) Counselor1457530107
  44. Sharon Rocha Martinez, DDSDentist1477387579
  45. Mindy Rochlin, LCSWClinical Social Worker1912147588
  46. Johnathan RodarteStudent in an Organized Health Care Education/Training Program1548196306
  47. Beverly Rodgers, LMFTMental Health Counselor1609896356
  48. Adrian RodriguezMarriage & Family Therapist1851780845
  49. Adriana RodriguezDoula1134017684
  50. Alejandra Rodriguez, MFTMarriage & Family Therapist1912281064

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.