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 82 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
- Tighe Ohanrahan, MDFamily Medicine Physician1316977846
- Keiko OhashiPharmacist1568893741
- Grace OhwobeteBehavior Technician1053289918
- Joanne OhwobeteBehavior Technician1265396550
- Madison OilerBehavior Technician1578120515
- Kimberly Oja, NPAdult Health Nurse Practitioner1396245064
- Anahi OjedaBehavior Technician1861042103
- Tessie Okamura, M.D.Pediatrics Physician1063446102
- Naomi Okawa, RN,IBCLCLactation Consultant (Registered Nurse)1043808850
- Mark Okawachi, PA-CSurgical Physician Assistant1114078631
- Chetachi Okereke, M.D, M.B.B.SRheumatology Physician1083842199
- Hector Oksenendler, DCPhysical Therapist1922101435
- Angela OliphantBehavior Technician1740148204
- Maria Teresa OlivaMarriage & Family Therapist1750685970
- Grace OlivasBehavior Technician1013807601
- Chelsea OliverBehavior Technician1821638529
- Rachel OliverFamily Medicine Physician1861845554
- Griselda Oliver Bucio, LMFTMarriage & Family Therapist1467918821
- Rhoda Olkin, PH.D.Specialist1366509838
- Joshua OllivierBehavior Technician1922787860
- Laura Olmstead, RPHPharmacist1811301088
- Steven Olsen, MDFamily Medicine Physician1457434128
- Jeffrey Olson, CPHTOther Technician1114358678
- Jacqueline Olympius, PA-CPhysician Assistant1578273579
- Emily OmaqueAssistant Behavior Analyst1184120180
- Denise Omen, RPHPharmacist1598838773
- Long On, PSY.D.Clinical Psychologist1053627117
- Julia Ondarza, PA-CPhysician Assistant1013537794
- Kelsey OneilClinical Social Worker1508582677
- Arlene OngpinRenal Dialysis Technician1578306098
- Lori Ono, PH.D.Clinical Psychologist1487719928
- Chioma OnyeaguchaBehavior Technician1720657745
- Bethany OnyweraBehavior Technician1902380389
- Samuel Oommen, M.D.Surgery Physician1942385851
- Marianna Oppenheimer, MD, MSCEmergency Medicine Physician1538657762
- Mona Orady, M.D.Obstetrics & Gynecology Physician1003970773
- Roy Orden, MDAllergy Physician1861781056
- Emily OrellanaBehavior Technician1053883736
- Esmeralda Orellana, M.EDAssistant Behavior Analyst1972467181
- Jon Christopher Orlino, M.D.Vascular Surgery Physician1265963789
- Linda Ormonde, P.T.Physical Therapist1356402655
- Zyna OrongBehavior Technician1215663588
- Ivy OronosBehavior Technician1437621513
- Jodi Oronsky, PTPhysical Therapist1467614883
- Sophia OropezaBehavior Analyst1417840950
- Alondra OrozcoBehavior Technician1174381727
- Elena OrozcoBehavior Technician1215796206
- Yadira OrozcoBehavior Technician1376206052
- Sandra Orozco Loza, LCSWClinical Social Worker1104116250
- Chelsea OrquizBehavior Analyst1336685213
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.