NPPES file of Aug 9, 2026

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.

CMS NPPES registry, file of Aug 9, 2026 · method · Verify with CMS →

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

  1. Thang Nguyen, DDSGeneral Practice Dentistry1902958044
  2. Johnathan Nilsen, RPHPharmacist1740799436
  3. Kristine NishiSocial Worker1164731550
  4. Jessalyn NothnagelBehavior Technician1215612726
  5. Ogochukwu Nwosu, DNP, FNP-BC,PMHNP-BCFamily Nurse Practitioner1265994818
  6. Jonathan Okman, M.D.Dermatology Physician1003227372
  7. Evelina OlsonAdult Medicine Physician1417615840
  8. Edna Opong-Mensah, RNCase Management Registered Nurse1912639766
  9. Gerardo Ordonez RodasBehavior Technician1952254740
  10. Juliana OrellanaBehavior Technician1407740095
  11. Manuella OrsiDoula1447043807
  12. Norah OtienoRegistered Nurse1003735770
  13. Helen Paek, O.D.Optometrist1528411261
  14. Franz PanganibanAttendant Care Provider1508757113
  15. Iraselma PaniaguaBehavior Technician1124731856
  16. Joyce PenalverMarriage & Family Therapist1457598211
  17. Natalie PerezBehavior Technician1205703550
  18. Andrea Perez PortilloClinical Social Worker1639624489
  19. Oksana Peters, PAPhysician Assistant1124143227
  20. Helaine Pleet, MD MPHPediatrics Physician1710039607
  21. Ramesha PowellBehavior Technician1821942798
  22. Nikan RassooliPharmacist1427743517
  23. Ronald RatherBehavior Technician1366398950
  24. Dyanie ReedBehavior Technician1831933746
  25. Gavin ReidBehavior Technician1730021957
  26. S. Gabriel Respicio, O.D.Optometrist1851358717
  27. Adonis ReyesBehavior Technician1578419255
  28. Haydee ReyesPhysical Therapist1891152963
  29. Bogdan RisticPhysician Assistant1609463538
  30. Adilia RivasBehavior Technician1982300604
  31. Monica RiveraPhysical Therapist1245587013
  32. Jaheem RobinsonBehavior Technician1316875537
  33. Kimberly RojasBehavior Analyst1912657214
  34. Karen RugamaMarriage & Family Therapist1750429676
  35. Leyla SaechaoPharmacist1396560181
  36. Jason Saffer, M.A. M.F.T.Marriage & Family Therapist1396908174
  37. Houda Saleh, CCC-SLPSpeech-Language Pathologist1073239992
  38. Evelyn Sanchez, RPHPharmacist1386926087
  39. Marangely Santiago, LMTMassage Therapist1649063157
  40. Meire SantosClinical Psychologist1316091804
  41. Kiley Santos VasquezBehavior Technician1164104170
  42. Jessica ServinBehavior Technician1023660610
  43. Akilah Shaheed, HCBDDoula1245116649
  44. Pallavi SharmaDentist1164113510
  45. Ravi Sharma, DPTPhysical Therapist1689507790
  46. Elizabeth Shipman, O.D.Optometrist1114478468
  47. Sydnie ShoalsBehavior Technician1629962485
  48. Aaron SmithClinical Social Worker1487541439
  49. Lenija SmithBehavior Technician1518822550
  50. Shawn SmithBehavior Technician1295461184

The largest California cities

  1. Los Angeles69,537
  2. San Diego52,937
  3. San Francisco38,143
  4. Sacramento33,083
  5. San Jose20,925

All of California →

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.