NPPES file of Aug 9, 2026

Registered Dietitian in California

7,148 NPPES records list registered dietitian with a practice address in California, 18 per 100,000 residents, the 35th highest rate of 51. San Diego and Los Angeles have the most; each record links to the provider's NPI and the California license search. Page 96 of 143.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 133V00000X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

San Diego has the most, 504

  1. San Diego504
  2. Los Angeles487
  3. San Francisco427
  4. Sacramento232
  5. San Jose151

Registered Dietitian records in California

  1. Katie O'Mara, RD, CLECapistrano Beach, CA 926241972959229
  2. Elizabeth O'Meara, RDSacramento, CA 958171952783649
  3. Frances O'Neil- HoppeOrange, CA 928691548413750
  4. Jason O'Neill, RDChula Vista, CA 919101942028097
  5. Jennifer O'Neill, RDNColton, CA 923241629780192
  6. Melanie O'Neill, RDBakersfield, CA 933061740632884
  7. Rachael O'Neill, RDNNorco, CA 928601396284501
  8. Stephanie Oakes, RDNRiverside, CA 925071740779461
  9. Dawn Oakley, MPH, RDYuba City, CA 959911013502749
  10. Samantha Oakley, MA, RD, LD, CDCESHanford, CA 932301437730298
  11. Yasmine ObeidRiverside, CA 925081194649996
  12. Ashlan Oberholtzer, MS, RDInglewood, CA 903011356360598
  13. Megan Obreiter, RDValley Village, CA 916071649896895
  14. Patricia Obrien, REGISTERED DIETITIANSacramento, CA 958171063472512
  15. Claudia Ocampo, REGISTERED DIETITIANOrange, CA 928671720835275
  16. Myla Ocampo-Wong, R.D.Hayward, CA 945411801055256
  17. Isabella Occhipinti, RDNSan Jose, CA 951201386398949
  18. Matthew Ochei, RDBellflower, CA 907061215628417
  19. Megan Ochipinti, RDNYuba City, CA 959931528987989
  20. Dorothy Oconnor, MS, RDLos Angeles, CA 900271124512116
  21. Kia Felicia Octaviano, RDNFountain Valley, CA 927081760105621
  22. Ryoko OdaValley Village, CA 916071407745250
  23. Sarah Odom, RDFremont, CA 945381922318609
  24. Maria Rodelita Odono, RDSan Marino, CA 911081629319371
  25. Kaitlyn Offhaus, RDEl Centro, CA 922431225671902
  26. Lynne OfficerSan Diego, CA 921021144176280
  27. Andrea Ogden, R.D.La Jolla, CA 920371891961264
  28. Katherine Oglesby, RDSan Diego, CA 921201437378312
  29. Carmen OhDaly City, CA 940151588239529
  30. Rebecca Oh, MPH, RDNGlendale, CA 912081588213805
  31. Shirley Ohlson, REGISTERED DIETITIANYuba City, CA 959911366804031
  32. Maria Oirkha, RDLa Jolla, CA 920931992582373
  33. Manuela Ojog, MS, RDRoseville, CA 956611497811186
  34. Lauren Okamura, RDWhittier, CA 906021457548554
  35. Breanne Okeefe, RDRoseville, CA 956611275332223
  36. Myra Okialda, R.D.San Leandro, CA 945771831255264
  37. Madison Okmin, MS, RDNWest Hollywood, CA 900481790515971
  38. Peace OkoyeFolsom, CA 956301578840476
  39. Lucrecia Olaes, RDLoma Linda, CA 923571548372519
  40. Tiffani Olaires, RDChico, CA 959281659063824
  41. Julie Oldenburg, RD, CDEInglewood, CA 903011477639557
  42. Isabella Oldham, RDN, LDNIrvine, CA 926031508686023
  43. Taylor-Rose Olea, RD, CEDSN Hollywood, CA 916011801672423
  44. Carly Oles, RDSanta Maria, CA 934541962358010
  45. Susan Olfert, R.D.Visalia, CA 932911609990555
  46. Amanda Oliveira, RDNVista, CA 920811932687357
  47. Aprilla Oliver, RDNManhattan Beach, CA 902661093567729
  48. Audrey Oliver, REGISTERED DIETITIANSan Francisco, CA 941161043431224
  49. Taylor OliveriaSacramento, CA 958251629359997
  50. Jamie Olivo, R.D.Livermore, CA 945501013214550

Source: CMS NPPES, primary taxonomy 133V00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 35 of 51 per resident

  1. Hawaii19
  2. Arkansas19
  3. Louisiana19
  4. California18
  5. Maryland18
  6. Nebraska18
  7. 50 states and D.C.20

Source: CMS NPPES, primary taxonomy 133V00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

5.4% of these records appear in a Medicare file, against 7.4% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. California5.4%
  2. United States7.4%

Registered Dietitian records in California, measured

  • In a Medicare file385 of 7,148 · 5.4% here, 7.4% nationally
  • In the CMS Doctors and Clinicians file531 · 7.4% here, 9.8% nationally
  • Not updated in five years or more3,904 · 54.6% here, 56.3% nationally
  • Median graduation year2014 · the 529 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 133V00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

7,148 NPPES records list registered dietitian (133V00000X) as their primary taxonomy with a practice address in California: 18 per 100,000 residents against 20 nationally (50 states and D.C.). San Diego has 504 of them (7%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. Texas5,099
  2. New York4,724
  3. Florida3,443
  4. Pennsylvania3,083

States with a similar rate per 100,000

  1. Maryland18.2
  2. Louisiana18.5
  3. Nebraska18.1
  4. Michigan18.1

The largest states

  1. Texas5,099
  2. New York4,724
  3. Florida3,443
  4. Pennsylvania3,083
  5. Illinois2,870

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

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.