Doctors and health care providers in Pasadena, CA
10,525 individual NPPES records list a practice address in Pasadena, 13th of 812 California cities. The largest group is behavior technician: 1,617, 15% of the city's records, against 18% across California. Page 138 of 211.
The 8 largest groups in Pasadena
Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.
Pasadena in California
- Rank in California13th of 812 cities by records
- Share of the state1.1% of California's records
- Specialties present25 or more taxonomy codes
- Top three groups34.4% of all records
Compared with California as a whole, Pasadena has 6.2× the state's share of rehabilitation practitioner records and 0.51× its share of general practice dentistry records.
Providers in Pasadena, alphabetically
- Patricia O'Connell, NPAcute Care Nurse Practitioner1770877409
- Donna Maria O'Connor, LMFTMental Health Counselor1508606864
- Michelle O'Connor, MDEmergency Medicine Physician1588155295
- Jenna O'Donnell, PMHNPPsychiatric/Mental Health Nurse Practitioner1134769011
- Sandra O'Donnell, PA-CPhysician Assistant1548223266
- James O'Dowd, M.D.Adult Reconstructive Orthopaedic Surgery Physician1093126336
- Shannon O'Flinn, PH.D.Clinical Psychologist1336344811
- Adam O'Toole, M.D.Plastic Surgery Physician1467795575
- Martin O'Toole, M.D.Plastic Surgery Physician1063504058
- Courtney OatiesLicensed Vocational Nurse1518566728
- Juliana ObeidBehavior Technician1306418165
- Ligaya OberesHome Health Registered Nurse1780016196
- Lauren OberlanderMental Health Counselor1447631270
- Pachita ObesoCase Manager/Care Coordinator1104353549
- Nnenna ObihStudent in an Organized Health Care Education/Training Program1851135404
- Anelyt ObleaBehavior Technician1407790983
- Andrew ObligacionBehavior Technician1629878962
- John Obsenares, P.T.Physical Therapist1124247077
- Daniela Ocasio, D.C.Chiropractor1861576118
- Jose Ocasio, D.C.Chiropractor1437233798
- Isabel OceguedaSocial Worker1881329738
- Maria OceguedaCase Manager/Care Coordinator1477033165
- Diana OcegueraRehabilitation Practitioner1801517768
- Jaliena Oceguera, BACase Manager/Care Coordinator1588123152
- Ashley OchoaBehavior Technician1285414946
- Brenda OchoaBehavior Technician1538834288
- Maria OchoaBehavior Technician1497336192
- Pedro OchoaRehabilitation Practitioner1255964888
- Ysenia Ochoa, RADTAddiction (Substance Use Disorder) Counselor1023990835
- Brian Oconnor, MDRheumatology Physician1770641870
- Janelle OctoberMarriage & Family Therapist1477847341
- Christopher OdellRehabilitation Practitioner1962733303
- Yivette Odell, PSY.D.Clinical Psychologist1568580785
- Sheri OdereMarriage & Family Therapist1932424181
- Alicia Odom, HOUSING SPECIALISTCase Manager/Care Coordinator1528608106
- Donna OdomAddiction (Substance Use Disorder) Counselor1225496748
- Dylan OdomBehavior Technician1316602295
- Nilliam OdumBehavior Technician1295351567
- Clara OeyBehavior Technician1699431460
- Kristine OganianRehabilitation Registered Nurse1356292684
- Ogechukwu OgboguStudent in an Organized Health Care Education/Training Program1699609172
- Richard OgePhysical Therapy Assistant1568105310
- Lindsay OginoSpeech-Language Pathologist1306133814
- Michael Ogrady, LPTLicensed Psychiatric Technician1811216849
- Zina OgunnayaBehavior Technician1972255180
- Hiroko Ogura, LACAcupuncturist1386072601
- Helen OhPediatrics Physician1952833535
- Joanne Oh, D. C.Chiropractor1538991963
- Justin OhBehavior Technician1932787033
- Maria OhClinical Psychologist1992998728
The largest California cities
- Los Angeles69,537
- San Diego52,937
- San Francisco38,143
- Sacramento33,083
- San Jose20,925
How to read this directory
Pasadena, California appears in the CMS National Plan and Provider Enumeration System with 10,525 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 Pasadena - 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 Pasadena 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 Pasadena is weighted toward Behavior Technician (1,617 clinicians, followed by Marriage & Family Therapist with 1,082 and Rehabilitation Practitioner with 924). 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, Pasadena reports roughly 27 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 Pasadena 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 Pasadena, CA?
There are 10,525 registered healthcare providers in Pasadena, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.
What are the most common medical specialties in Pasadena?
The most common specialties in Pasadena are Behavior Technician, Marriage & Family Therapist, Rehabilitation Practitioner, Student in an Organized Health Care Education/Training Program, Clinical Social Worker. Behavior Technician has the most providers with 1,617.
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.