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 38 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. Kathleen IppolitoMarriage & Family Therapist1386812709
  2. Joshua Ireland, PAEmergency Medicine Physician1689632671
  3. Ashley Ironside, CCC-SLPSpeech-Language Pathologist1851228852
  4. Corrine IrwinSpeech-Language Pathologist1174466122
  5. Roxanne IrwinMarriage & Family Therapist1316066327
  6. Chinekperem IsiguzoRehabilitation Practitioner1386717106
  7. Milton Island, ACSWClinical Social Worker1275863144
  8. Crystal Isom, MAMarriage & Family Therapist1972877645
  9. Steven Israel, OPTOMETRISTOptometrist1689724585
  10. Lucia Istupe SalgadoDay Training/Habilitation Specialist1043040447
  11. Rachel Ivison, IBCLCLactation Consultant (Non-RN)1306583570
  12. Melanie Iweze, LVNLicensed Practical Nurse1245650795
  13. Shanette IzadiMental Health Counselor1245880087
  14. Maggie Izmirian, LCSWClinical Social Worker1326503905
  15. Bryan JackoAddiction (Substance Use Disorder) Counselor1023870227
  16. Barbara JacksonRehabilitation Practitioner1306098009
  17. Deajah JacksonBehavior Technician1093436883
  18. Deborah Jackson, RADTAddiction (Substance Use Disorder) Counselor1922784792
  19. Fern JacksonRegistered Nurse1316653223
  20. Jayde JacksonBehavior Technician1982347936
  21. Joseph JacksonCommunity Health Worker1700138401
  22. Lashan Jackson, RADIAddiction (Substance Use Disorder) Counselor1104358399
  23. Lateshia JacksonDoula1811820194
  24. Leroy JacksonAddiction (Substance Use Disorder) Counselor1891900155
  25. Malika JacksonCase Manager/Care Coordinator1326695131
  26. Marykatherine JacksonStudent in an Organized Health Care Education/Training Program1992360291
  27. Mia JacksonRegistered Nurse1952259129
  28. Raquel Jackson, MFT INTERNMarriage & Family Therapist1447502042
  29. Robert Jackson, M.D.Otolaryngology/Facial Plastic Surgery Physician1982799615
  30. Susan JacksonStudent in an Organized Health Care Education/Training Program1871266023
  31. Victoria JacksonCommunity Health Worker1033238928
  32. Rochelle Jackson MontgomeryClinical Social Worker1629706155
  33. Lauren Jacobs, BCBABehavior Analyst1396210795
  34. Ali Jafferi, M.D.Internal Medicine Physician1912042235
  35. Ana Jaimes AragonMarriage & Family Therapist1699369785
  36. Indu Jain, M.D.Anesthesiology Physician1639156979
  37. Aquilah James, LCSWClinical Social Worker1942809892
  38. Jared JamesBehavior Technician1477268761
  39. Jaleesa Jamison, APCCProfessional Counselor1639924715
  40. Alia Jamison-Dinowitz, FNP-CFamily Nurse Practitioner1942862453
  41. Lingaiah Janumpally, MDNeurology Physician1003892316
  42. Ravi Janumpally, M.D.Internal Medicine Physician1952796542
  43. Shirisha Janumpally, M.D.Neurology Physician1215128020
  44. Jennifer JanvrinAddiction (Substance Use Disorder) Counselor1598042558
  45. Gabriela JaramilloCase Manager/Care Coordinator1104186766
  46. Victoria JaramilloRehabilitation Practitioner1265027320
  47. Isaac Jarsen, D.D.S.General Practice Dentistry1699895722
  48. Wayne JarvisBehavior Technician1588513154
  49. Jesse Jasak, MRAS, CSCAddiction (Substance Use Disorder) Counselor1528290517
  50. Richa JauhariStudent in an Organized Health Care Education/Training Program1770860546

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.