Doctors and health care providers in Walnut Creek, CA
6,170 individual NPPES records list a practice address in Walnut Creek, 23rd of 812 California cities. The largest group is behavior technician: 1,764, 29% of the city's records, against 18% across California. Page 83 of 124.
The 8 largest groups in Walnut Creek
Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.
Walnut Creek in California
- Rank in California23rd of 812 cities by records
- Share of the state0.6% of California's records
- Specialties present25 or more taxonomy codes
- Top three groups37.6% of all records
Compared with California as a whole, Walnut Creek has 3.5× the state's share of hospitalist physician records and 0.39× its share of mental health counselor records.
Providers in Walnut Creek, alphabetically
- Desiree OrtegaBehavior Technician1194333070
- Elizabeth OrtegaBehavior Technician1952153413
- Marlena Orthlieb, MGCSGenetic Counselor (M.S.)1366095390
- Ashlie OrtizBehavior Technician1619717410
- Carina OrtizBehavior Technician1154188621
- Emily OrtizBehavior Technician1558122093
- Jeff Ortiz, MDInternal Medicine Physician1891873964
- Maria OrtizBehavior Technician1336826395
- Maritza OrtizBehavior Technician1043926793
- Ramon Ortiz, MDHospitalist Physician1376621433
- Ruby OrtizBehavior Technician1336822386
- Lidia Ortiz BravoBehavior Technician1992480081
- Leslie Ortiz-RuizBehavior Analyst1639641814
- Marianne Orton, CPNPPediatric Nurse Practitioner1982097853
- Chike OsakweBehavior Technician1396527941
- Mason OsbergBehavior Technician1962141796
- Eleana OsborneBehavior Technician1578448338
- John Osborne, LCSWClinical Social Worker1154500908
- Crystal OsegueraBehavior Technician1902790926
- Monica Oseguera ValenciaBehavior Technician1851240980
- Ebunoluwa Oshinuga-Atere, MDInternal Medicine Physician1083349609
- David Osorio-CeronBehavior Technician1346959384
- Jennifer OstranderCase Management Registered Nurse1295283703
- Shasta OstranderBehavior Technician1033911631
- Obinna Osuka, BSBehavior Technician1700403433
- Douglas Ota, RPHPharmacist1821161373
- Jill Otani, O.T.Hand Occupational Therapist1497791354
- Fernando Otero, MDVascular Surgery Physician1346244183
- Cianelle-Alexa OttBehavior Technician1245156835
- Joshua OtteCertified Registered Nurse Anesthetist1801180369
- Brooke Otterson, PSYDClinical Psychologist1134312267
- Eric Ottey, MDFamily Medicine Physician1447756820
- Andrew Otto, M.D.Emergency Medicine Physician1578862157
- Chun Ouyang, M.D., PH.D.Internal Medicine Physician1336115328
- Michael Overfield, MDEmergency Medicine Physician1205914397
- Adrieanna OviedoBehavior Technician1447734454
- Angel OviedoBehavior Technician1134989692
- Margaret Owen-WilsonClinical Child & Adolescent Psychologist1619006459
- Melissa Owens, M.D.Hospitalist Physician1568607414
- Sharon Owens, MFTMarriage & Family Therapist1710054226
- Stephanie OwensBehavior Technician1750842837
- Awujoola OyeleyeBehavior Technician1265157713
- Robert Ozaki, D.O.Sports Medicine (Family Medicine) Physician1851358915
- Katharine Ozeki, M.D.Gastroenterology Physician1306290838
- Paul Pabst, MDAnesthesiology Physician1417992926
- Diana PachecoBehavior Technician1093680811
- Jonathan Packman, AMFT, APCCMental Health Counselor1568178325
- Isabela PadillaBehavior Technician1437040227
- Leslie PadillaBehavior Technician1952928632
- Mary Anne Padilla, PHARM.D.Pharmacist1750667424
The largest California cities
- Los Angeles69,537
- San Diego52,937
- San Francisco38,143
- Sacramento33,083
- San Jose20,925
How to read this directory
Walnut Creek, California appears in the CMS National Plan and Provider Enumeration System with 6,170 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 Walnut Creek - 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 Walnut Creek 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 Walnut Creek is weighted toward Behavior Technician (1,764 clinicians, followed by Marriage & Family Therapist with 315 and Pharmacist with 239). 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, Walnut Creek reports roughly 15.8 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, Student in an Organized Health Care Education/Training Program is the most prominent one with no provider currently listing a Walnut Creek practice address, a coverage gap Walnut Creek patients typically fill by traveling to a larger nearby hub.
For Walnut Creek 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 Walnut Creek, CA?
There are 6,170 registered healthcare providers in Walnut Creek, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.
What are the most common medical specialties in Walnut Creek?
The most common specialties in Walnut Creek are Behavior Technician, Marriage & Family Therapist, Pharmacist, Behavior Analyst, Internal Medicine Physician. Behavior Technician has the most providers with 1,764.
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.