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 49 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. Jessica MarchanyAddiction (Substance Use Disorder) Counselor1659667871
  2. Jerome Marcos, NPNurse Practitioner1538462999
  3. Michael Marcus, MDPsychiatry Physician1316380306
  4. Ma Guadalupe Marentes VargasBehavior Technician1902520281
  5. Mary Maresh, PH.D.Psychologist1740520261
  6. S Joseph Marianayagam, MDInternal Medicine Physician1679673776
  7. Rosario Marin, LVNLicensed Vocational Nurse1174234009
  8. Belinda MariscalCounselor1639451677
  9. Jessica MariscalLicensed Vocational Nurse1083383780
  10. Samantha Markman, MFT INTERNMarriage & Family Therapist1962849414
  11. Kayla Marotta, PSYDStudent in an Organized Health Care Education/Training Program1386451292
  12. Marjorie MarquezCommunity Health Worker1275043184
  13. Valerie Marquez, LVNLicensed Vocational Nurse1427983766
  14. Delia Marquez Gonzalez, RBTBehavior Technician1134970866
  15. Yvette Marquez-SmithCase Manager/Care Coordinator1982981031
  16. Jessica Marroquin, BABehavior Technician1942769260
  17. Elizabeth Marsh, LCSWClinical Social Worker1922197912
  18. Kasey MarshMarriage & Family Therapist1316221161
  19. Ammie MarshallAddiction (Substance Use Disorder) Counselor1467608992
  20. Ashlie MarshallBehavior Technician1003642984
  21. Gisela MarshallClinical Social Worker1497546147
  22. Karnesha MarshallBehavior Technician1750081220
  23. Natasha Marshall, DPMFoot & Ankle Surgery Podiatrist1427280304
  24. Halima Martelli, LCSW23492Clinical Social Worker1669656294
  25. Marizol MartiRehabilitation Practitioner1700271616
  26. Jerry Martin, O.D.Optometrist1679543821
  27. Melody Martin, BS, MA, MFTIMarriage & Family Therapist1407996366
  28. Nicole Martin, PPSMental Health Counselor1033463559
  29. Liam Martin Del CampoBehavior Technician1821948175
  30. Helen Martinelli-OrozcoClinical Social Worker1275735003
  31. Angie MartinezBehavior Technician1629702972
  32. Bianca Martinez, LMFTMarriage & Family Therapist1013653062
  33. Citlalli Martinez, IBCLCLactation Consultant (Non-RN)1205530060
  34. Daniel MartinezRehabilitation Practitioner1336966381
  35. David MartinezRehabilitation Practitioner1467570713
  36. Denise MartinezStudent in an Organized Health Care Education/Training Program1255140927
  37. Diana MartinezBehavior Technician1942779079
  38. Emelyne MartinezBehavior Technician1245799527
  39. Esther MartinezBehavior Technician1801543947
  40. Francisco Martinez, PTOrthopedic Physical Therapist1619317658
  41. Francisco MartinezNursing Home Administrator1417603499
  42. Graciela MartinezRespiratory/Developmental/Rehabilitative Specialist/Technologist1063055176
  43. Jennifer MartinezRehabilitation Practitioner1912782277
  44. Karla MartinezDay Training/Habilitation Specialist1649160987
  45. Katherine MartinezCase Manager/Care Coordinator1346865359
  46. Laura MartinezObstetrics Physician1134866577
  47. Lesley MartinezBehavior Technician1093427858
  48. Leslie MartinezDay Training/Habilitation Specialist1417781857
  49. Luis Martinez, MAMarriage & Family Therapist1619397882
  50. Luz Martinez, NPNurse Practitioner1700926904

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.