NPPES file of Aug 9, 2026

Doctors and health care providers in Los Angeles, CA

69,537 individual NPPES records list a practice address in Los Angeles, 1st of 812 California cities. The largest group is students in training: 6,770, 10% of the city's records, against 4% across California. Page 187 of 1,391.

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

The 8 largest groups in Los Angeles

Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.

Los Angeles in California

  • Rank in California1st of 812 cities by records
  • Share of the state7.2% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups23.8% of all records
  • Students in training rank1st of the 10 California cities with the most

Compared with California as a whole, Los Angeles has 2.3× the state's share of student in an organized health care education/training program records and 0.40× its share of behavior technician records.

Providers in Los Angeles, alphabetically

  1. Alfredo CastellanosAddiction (Substance Use Disorder) Counselor1588184188
  2. Alice CastellanosCommunity Health Worker1013158559
  3. Angelina Castellanos, ASWClinical Social Worker1750605804
  4. Araceli CastellanosRehabilitation Practitioner1770615536
  5. Ashley CastellanosCommunity Health Worker1225834187
  6. Bethany CastellanosBehavior Technician1225901754
  7. Carlos Castellanos, MDStudent in an Organized Health Care Education/Training Program1982306858
  8. Denise CastellanosRehabilitation Practitioner1598114514
  9. Elizabeth CastellanosBehavior Technician1083492235
  10. Gloria Castellanos, PTPhysical Therapist1376750190
  11. Goselyn CastellanosRehabilitation Practitioner1770340044
  12. Jorge CastellanosAddiction (Substance Use Disorder) Counselor1053163584
  13. Kathleen Castellanos, M.A.Student in an Organized Health Care Education/Training Program1316295496
  14. Kimberly CastellanosSchool Social Worker1871466649
  15. Krystyn CastellanosBehavior Technician1164249959
  16. Mariajose CastellanosClinical Social Worker1871012641
  17. Melissa CastellanosCase Manager/Care Coordinator1538896378
  18. Noelia Castellanos, LMFTMarriage & Family Therapist1427501386
  19. Orlando CastellanosBehavior Technician1477389377
  20. Paul CastellanosMilitary Health Care Provider1801483904
  21. Pedro CastellanosStudent in an Organized Health Care Education/Training Program1972363059
  22. Samantha CastellanosBehavior Technician1669313805
  23. Selena CastellanosBehavior Technician1851243612
  24. Stephanie CastellanosMarriage & Family Therapist1184401028
  25. Yesenia CastellanosClinical Social Worker1497004022
  26. Luz Elena Castellanos AlemanStudent in an Organized Health Care Education/Training Program1780319004
  27. Georgina Castellanos AlvaradoClinical Social Worker1194974691
  28. Cristina Castellanos JimenezPhysician Assistant1962170092
  29. Jacquelyn Castellanos MunguiaBehavior Technician1497506489
  30. Andiver Castellanos-Alvarez, LCSWClinical Social Worker1548180623
  31. Janelle Castellino, MD, PHARMDRheumatology Physician1851716039
  32. Carmen Castellon, DADental Assistant1427295377
  33. Erick Castellon, AA, CATCCase Manager/Care Coordinator1538372990
  34. Julio CastellonDental Assistant1306211206
  35. Scarlett Castellon, SUDRC #13999Addiction (Substance Use Disorder) Counselor1447074679
  36. Stephanie CastellonAddiction (Substance Use Disorder) Counselor1821387168
  37. Steven Castellon, PH.D.Clinical Psychologist1316030901
  38. Yelba Castellon-Lopez, M.D.Family Medicine Physician1255692778
  39. Naomi Castellon-PerezStudent in an Organized Health Care Education/Training Program1245066836
  40. Catherine Castelo, M.D.Counselor1881891638
  41. James Castelo, D.D.SDentist1144467341
  42. Marco CasteloRegistered Nurse1811127095
  43. Shara Castelo, AMFTMarriage & Family Therapist1427929793
  44. Virginia Castelo, DMDGeneral Practice Dentistry1124004742
  45. Michael CasterStudent in an Organized Health Care Education/Training Program1972205524
  46. Haley Castiglione, N.P.Hematology & Oncology Physician1528148921
  47. Bryan CastillaMarriage & Family Therapist1992289185
  48. Naylli CastillejosAddiction (Substance Use Disorder) Counselor1972268191
  49. Adam CastilloMental Health Counselor1396377495
  50. Adrian Castillo, M.D.Cardiovascular Disease Physician1679006605

The largest California cities

  1. San Diego52,937
  2. San Francisco38,143
  3. Sacramento33,083
  4. San Jose20,925
  5. Fresno19,440

All of California →

How to read this directory

Los Angeles, California appears in the CMS National Plan and Provider Enumeration System with 69,537 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 Los Angeles - 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 Los Angeles 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 Los Angeles is weighted toward Student in an Organized Health Care Education/Training Program (6,770 clinicians, followed by Behavior Technician with 4,965 and Clinical Social Worker with 4,806). 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, Los Angeles reports roughly 178.5 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.

Of California's most common specialties, Behavior Analyst is the most prominent one with no provider currently listing a Los Angeles practice address, a coverage gap Los Angeles patients typically fill by traveling to a larger nearby hub.

For Los Angeles 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 Los Angeles, CA?

There are 69,537 registered healthcare providers in Los Angeles, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Los Angeles?

The most common specialties in Los Angeles are Student in an Organized Health Care Education/Training Program, Behavior Technician, Clinical Social Worker, Marriage & Family Therapist, Case Manager/Care Coordinator. Student in an Organized Health Care Education/Training Program has the most providers with 6,770.

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.