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 178 of 265.
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
- Jaelynn OnoBehavior Technician1235876111
- Jon Onosaki, PA-CPhysician Assistant1396059754
- Eric Ontiveros, M.D.Anesthesiology Physician1477574986
- Lourdes OntiverosAddiction (Substance Use Disorder) Counselor1790866515
- Doris Onuohah, NPPsychiatric/Mental Health Nurse Practitioner1578765137
- Catherine OnwordiLicensed Vocational Nurse1265233167
- Joshua OommenStudent in an Organized Health Care Education/Training Program1558209700
- Kurt Openshaw, M.D.Diagnostic Radiology Physician1881693174
- Teri OpferBehavior Technician1043155617
- Ronaldo Opinga, D.M.D.General Practice Dentistry1497991020
- Victoria Oppenheim, MDEmergency Medicine Physician1700345519
- Aries OrangeMarriage & Family Therapist1992195515
- Brenda OrdazCase Manager/Care Coordinator1841620812
- Siboney Ordaz, MSWSocial Worker1144996935
- Maria Jose Ordenana, RN FNPFamily Nurse Practitioner1063157352
- Michael Ordon, M.D.Urology Physician1801133731
- Narin OrdoubadiBehavior Technician1033912985
- Carlos OrdunoBehavior Technician1215708730
- Aurora OregelClinical Social Worker1649546615
- Kyle OreillyCritical Care Medicine Registered Nurse1689402414
- Catherine OrejelBehavior Technician1962229666
- Gilbert OrellanaPharmacy Technician1770390858
- Julia OrendainOther Technician1538815022
- Miguel Orendain Moreno, BCBABehavior Analyst1518426089
- Madison OrmsbeeBehavior Technician1831844190
- Carlos OrnelasOther Technician1538830021
- Jacqueline OrnelasBehavior Technician1447186531
- Valarie OronaDay Training/Habilitation Specialist1477241644
- Cristal OropezaBehavior Technician1508591660
- Vanessa OropezaDay Training/Habilitation Specialist1679287908
- Emmeline Oros, PAPhysician Assistant1659020329
- Lorraine OroscoBehavior Technician1588472625
- Emma Orozco, SONOGRAPHY CERTSonography Radiologic Technologist1114624301
- Jonathan OrozcoBehavior Analyst1306381280
- Martin OrozcoMental Health Counselor1215747340
- Misti OrozcoMental Health Counselor1629300975
- Monica OrozcoBehavior Technician1790479889
- Pedro Orozco, M.D.Anesthesiology Physician1902098858
- Melany Orozco GuzmanBehavior Technician1922705961
- Michelangelo OrsiLicensed Psychiatric Technician1447706916
- Aaron OrtegaBehavior Technician1851160956
- Ana OrtegaAssistant Behavior Analyst1538625140
- Ashly OrtegaBehavior Technician1942191804
- Ava OrtegaBehavior Technician1154203545
- Jocelyn OrtegaBehavior Technician1417846478
- Laisha OrtegaBehavior Technician1538914528
- Maritza OrtegaBehavior Technician1558019901
- Montserrat OrtegaBehavior Technician1790475630
- Nancy Ortega, LPTLicensed Psychiatric Technician1265772875
- Oscar OrtegaBehavior Technician1073400388
The largest California cities
- Los Angeles69,537
- San Diego52,937
- San Francisco38,143
- Sacramento33,083
- San Jose20,925
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.