Doctors and health care providers in Hercules, CA
277 individual NPPES records list a practice address in Hercules, 353rd of 812 California cities. The largest group is behavior technician: 111, 40% of the city's records, against 18% across California. Page 5 of 6.
The 8 largest groups in Hercules
Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.
Hercules in California
- Rank in California353rd of 812 cities by records
- Share of the state<0.1% of California's records
- Specialties present25 or more taxonomy codes
- Top three groups49.8% of all records
Compared with California as a whole, Hercules has 2.3× the state's share of behavior technician records.
Providers in Hercules, alphabetically
- Thang Nguyen, DDSGeneral Practice Dentistry1902958044
- Johnathan Nilsen, RPHPharmacist1740799436
- Kristine NishiSocial Worker1164731550
- Jessalyn NothnagelBehavior Technician1215612726
- Ogochukwu Nwosu, DNP, FNP-BC,PMHNP-BCFamily Nurse Practitioner1265994818
- Jonathan Okman, M.D.Dermatology Physician1003227372
- Evelina OlsonAdult Medicine Physician1417615840
- Edna Opong-Mensah, RNCase Management Registered Nurse1912639766
- Gerardo Ordonez RodasBehavior Technician1952254740
- Juliana OrellanaBehavior Technician1407740095
- Manuella OrsiDoula1447043807
- Norah OtienoRegistered Nurse1003735770
- Helen Paek, O.D.Optometrist1528411261
- Franz PanganibanAttendant Care Provider1508757113
- Iraselma PaniaguaBehavior Technician1124731856
- Joyce PenalverMarriage & Family Therapist1457598211
- Natalie PerezBehavior Technician1205703550
- Andrea Perez PortilloClinical Social Worker1639624489
- Oksana Peters, PAPhysician Assistant1124143227
- Helaine Pleet, MD MPHPediatrics Physician1710039607
- Ramesha PowellBehavior Technician1821942798
- Nikan RassooliPharmacist1427743517
- Ronald RatherBehavior Technician1366398950
- Dyanie ReedBehavior Technician1831933746
- Gavin ReidBehavior Technician1730021957
- S. Gabriel Respicio, O.D.Optometrist1851358717
- Adonis ReyesBehavior Technician1578419255
- Haydee ReyesPhysical Therapist1891152963
- Bogdan RisticPhysician Assistant1609463538
- Adilia RivasBehavior Technician1982300604
- Monica RiveraPhysical Therapist1245587013
- Jaheem RobinsonBehavior Technician1316875537
- Kimberly RojasBehavior Analyst1912657214
- Karen RugamaMarriage & Family Therapist1750429676
- Leyla SaechaoPharmacist1396560181
- Jason Saffer, M.A. M.F.T.Marriage & Family Therapist1396908174
- Houda Saleh, CCC-SLPSpeech-Language Pathologist1073239992
- Evelyn Sanchez, RPHPharmacist1386926087
- Marangely Santiago, LMTMassage Therapist1649063157
- Meire SantosClinical Psychologist1316091804
- Kiley Santos VasquezBehavior Technician1164104170
- Jessica ServinBehavior Technician1023660610
- Akilah Shaheed, HCBDDoula1245116649
- Pallavi SharmaDentist1164113510
- Ravi Sharma, DPTPhysical Therapist1689507790
- Elizabeth Shipman, O.D.Optometrist1114478468
- Sydnie ShoalsBehavior Technician1629962485
- Aaron SmithClinical Social Worker1487541439
- Lenija SmithBehavior Technician1518822550
- Shawn SmithBehavior Technician1295461184
The largest California cities
- Los Angeles69,537
- San Diego52,937
- San Francisco38,143
- Sacramento33,083
- San Jose20,925
How to read this directory
Hercules, California appears in the CMS National Plan and Provider Enumeration System with 277 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 Hercules - 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 Hercules 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 Hercules is weighted toward Behavior Technician (111 clinicians, followed by Pharmacist with 14 and Behavior Analyst with 13). 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, Hercules reports roughly 0.7 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 Hercules practice address, a coverage gap Hercules patients typically fill by traveling to a larger nearby hub.
For Hercules 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 Hercules, CA?
There are 277 registered healthcare providers in Hercules, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.
What are the most common medical specialties in Hercules?
The most common specialties in Hercules are Behavior Technician, Pharmacist, Behavior Analyst, Optometrist, Dentist. Behavior Technician has the most providers with 111.
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.