NPPES file of Aug 9, 2026

Doctors and health care providers in Portola Valley, CA

84 individual NPPES records list a practice address in Portola Valley, 511th of 812 California cities. The largest group is physical therapist: 8, 10% of the city's records, against 2% across California. Page 2 of 2.

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

The 8 largest groups in Portola Valley

Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.

Portola Valley in California

  • Rank in California511th of 812 cities by records
  • Share of the state<0.1% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups22.6% of all records

Providers in Portola Valley, alphabetically

  1. Jane Morton, M.D.Pediatrics Physician1285778324
  2. Emma Morton-Bours, M.D.Internal Medicine Physician1316003528
  3. Omondi Nyongo, MDOphthalmology Physician1629099015
  4. Gregory Ohanessian, PT, DPTPhysical Therapist1306139209
  5. Katherine Ohanlan, M.D.Gynecologic Oncology Physician1467486407
  6. Crista Osio, PT, MSPTPhysical Therapist1154567121
  7. Felipe PalmaSpeech-Language Pathologist1427946441
  8. Ellen Payne, MA, ATC, CSCSAthletic Trainer1003833989
  9. Rachel PerlmanObstetrics & Gynecology Physician1649339045
  10. Rochelle Perucca, M.F.T.Counselor1922512979
  11. Gerald Piaget, PHDPsychologist1568599868
  12. Krista Regedanz, PH.D.Clinical Psychologist1548456676
  13. Mark Rosen, DONeuromusculoskeletal Medicine & OMM Physician1942338009
  14. Massy Safai, M.D.Specialist1487872172
  15. Gerard Sarnat, M.D.Internal Medicine Physician1750658415
  16. Lawrence Saunders, DMD,MSOral and Maxillofacial Surgery (Dentist)1255492617
  17. George Savage, M.D.Emergency Medical Services (Emergency Medicine) Physician1841659067
  18. Diane Schiano, PHD, MACP (2012)Counselor1184991275
  19. John Selling, MDGastroenterology Physician1386608024
  20. Amy Sharp, PHDClinical Psychologist1598134678
  21. Joseph Smith, PHD, ATCAthletic Trainer1275998098
  22. Lisa Stanger, RNGeneral Practice Registered Nurse1255259982
  23. Martin Stein, M. D.Endocrinology, Diabetes & Metabolism Physician1871901397
  24. Vibeke Strand, M.D.Rheumatology Physician1194882753
  25. Gwendolyn Stritter, MDPain Medicine (Anesthesiology) Physician1902087828
  26. Ning Tang, M.D.Internal Medicine Physician1790806131
  27. James Vetter, M.D.Cardiovascular Disease Physician1306196803
  28. Oscar Wand, M.D.Ophthalmology Physician1700944154
  29. Elena Williamson, DPT, PTPhysical Therapist1760256903
  30. Rachel Winer, M.D.Psychiatry Physician1497014955
  31. Jeremy Woodbury, PT, DPTPhysical Therapist1700602778
  32. Amanda Yonkers, COOrthoptist1619490547
  33. Stuart Young, M.D.Diagnostic Radiology Physician1639552938
  34. Joyce Yulo, D.C.Chiropractor1891985636

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

Portola Valley, California appears in the CMS National Plan and Provider Enumeration System with 84 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 Portola Valley - 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 Portola Valley 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 Portola Valley is weighted toward Physical Therapist (8 clinicians, followed by Internal Medicine Physician with 6 and Psychiatry Physician with 5). 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, Portola Valley reports roughly 0.2 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, Behavior Technician is the most prominent one with no provider currently listing a Portola Valley practice address, a coverage gap Portola Valley patients typically fill by traveling to a larger nearby hub.

For Portola Valley 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 Portola Valley, CA?

There are 84 registered healthcare providers in Portola Valley, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Portola Valley?

The most common specialties in Portola Valley are Physical Therapist, Internal Medicine Physician, Psychiatry Physician, Marriage & Family Therapist, Chiropractor. Physical Therapist has the most providers with 8.

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.