NPPES file of Aug 9, 2026

Doctors and health care providers in Orange, CA

13,245 individual NPPES records list a practice address in Orange, 11th of 812 California cities. The largest group is behavior technician: 4,271, 32% of the city's records, against 18% across California. Page 223 of 265.

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

The 8 largest groups in Orange

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

Orange in California

  • Rank in California11th of 812 cities by records
  • Share of the state1.4% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups42% of all records
  • Behavior Technician rank7th of the 10 California cities with the most

Compared with California as a whole, Orange has 7.3× the state's share of other technician records and 0.43× its share of physical therapist records.

Providers in Orange, alphabetically

  1. Imran Siddiqi, M.D., PH.D.Hematology (Pathology) Physician1942473285
  2. Nayeem Siddique, BCBABehavior Analyst1598272205
  3. Nadine SidhomPsychologist1275089583
  4. Ramy Sidhom, M.D.Internal Medicine Physician1134583065
  5. Suhail Sidhu, MDStudent in an Organized Health Care Education/Training Program1811756026
  6. Erica Siepker, BSBehavior Technician1649085101
  7. Crystal SierraBehavior Technician1568152999
  8. Jackson SierraBehavior Technician1700600038
  9. Brooklyn SieversBehavior Technician1710724059
  10. Shahzeen SiganporiaPhysical Therapist1134580129
  11. Geoffrey Sigmund, M.D.Neuroradiology Physician1710152988
  12. Lorna Sikorski, M.A., CCC-SPSpeech-Language Pathologist1750528584
  13. Janeth Silenski, LVNLicensed Vocational Nurse1114790466
  14. Maricruz SillasBehavior Technician1417603754
  15. Jack Sills, MDNeonatal-Perinatal Medicine Physician1528114774
  16. Ashley SilvaBehavior Technician1063290450
  17. Caleb SilvaBehavior Technician1659227213
  18. Chassity SilvaBehavior Technician1659239432
  19. Emelia SilvaBehavior Technician1043064462
  20. Itzel SilvaBehavior Technician1255267753
  21. Marytza SilvaClinical Social Worker1447673462
  22. Monica SilvaBehavior Technician1972379410
  23. Natalie SilvaBehavior Technician1922625524
  24. Stephanie SilvaBehavior Technician1285599811
  25. Vivian SilvaBehavior Technician1104785849
  26. William SilvaBehavior Technician1356006274
  27. Arturo Silva Suarez, DDSDentist1164675971
  28. Sabrina Silveira-D'Avila, NPAcute Care Nurse Practitioner1518658434
  29. Phallin Silver, NPFamily Nurse Practitioner1548039464
  30. Eve Silverman, LMFTMarriage & Family Therapist1942084512
  31. Lauren SilveyOther Technician1760067664
  32. Dylan SimBehavior Technician1891661716
  33. Madeleine SimbulanBehavior Technician1629810494
  34. Sierra Simmons, M.D.Blood Banking & Transfusion Medicine Physician1750726014
  35. Stacy Simmons, CPHTPharmacy Technician1649676347
  36. Sonia Simms, MDEmergency Medicine Physician1619922069
  37. Aaron Simon, MD, PHDRadiation Oncology Physician1801250550
  38. Giuseppina SimoneStudent in an Organized Health Care Education/Training Program1699614867
  39. Anne R Simoneau, MDUrology Physician1790865947
  40. Ashley SimpsonBehavior Technician1033951801
  41. Donny SimpsonMarriage & Family Therapist1649602210
  42. Jennifer Simpson, MDOphthalmology Physician1609956853
  43. Toron SimpsonMental Health Counselor1275984817
  44. Joe SimsRehabilitation Practitioner1124488663
  45. Lauren SinclairBehavior Technician1629773593
  46. Ashley Sincosky, BCBABehavior Technician1457004756
  47. Lilian SingBehavior Technician1932917861
  48. Lisa Singer, MSN, AGACNP-BCNurse Practitioner1346671096
  49. Elisa SinghPhysician Assistant1861152167
  50. Hardeep Singh, M.D.Gastroenterology Physician1275544074

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

Orange, California appears in the CMS National Plan and Provider Enumeration System with 13,245 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 Orange - 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 Orange 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 Orange is weighted toward Behavior Technician (4,271 clinicians, followed by Student in an Organized Health Care Education/Training Program with 870 and Marriage & Family Therapist with 424). 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, Orange reports roughly 34 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, Case Manager/Care Coordinator is the most prominent one with no provider currently listing a Orange practice address, a coverage gap Orange patients typically fill by traveling to a larger nearby hub.

For Orange 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 Orange, CA?

There are 13,245 registered healthcare providers in Orange, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Orange?

The most common specialties in Orange are Behavior Technician, Student in an Organized Health Care Education/Training Program, Marriage & Family Therapist, Clinical Social Worker, Mental Health Counselor. Behavior Technician has the most providers with 4,271.

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.