NPPES file of Aug 9, 2026

Gastroenterology Physician in California

2,140 NPPES records list gastroenterology physician with a practice address in California, 5.5 per 100,000 residents, the 25th highest rate of 51. Los Angeles and San Diego have the most; each record links to the provider's NPI and the California license search. Page 32 of 43.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207RG0100X · method

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

Los Angeles has the most, 195

  1. Los Angeles195
  2. San Diego125
  3. San Francisco103
  4. Sacramento90
  5. Stanford70

Gastroenterology Physician records in California

  1. Daniel Rengstorff, M.D.San Mateo, CA 944021033295662
  2. Howard Resin, M.D.Torrance, CA 905051164477519
  3. Frank Reynolds, M.D.Sacramento, CA 958161255442778
  4. Ali RezaieWest Hollywood, CA 900481356765739
  5. Anahita Rezaie, MDDuarte, CA 910101821294000
  6. Mona Rezapour, M.D.West Hills, CA 913071841559580
  7. Boris Reznik, M.D.Hanford, CA 932301710087846
  8. Horace Rhee, MD, PHDStanford, CA 943051881843191
  9. Dae Rheem, M.D.Los Angeles, CA 900201295915585
  10. Ernest Ribera, MDBurlingame, CA 940101285644286
  11. Allyson Richardson, MDSan Francisco, CA 941431578024014
  12. Dean Rider, MDSan Francisco, CA 941181487759296
  13. Jonathan Riegler, MDTempleton, CA 934651184725707
  14. Brian Riff, MDAnaheim, CA 928011194969030
  15. Gurpreet Rihal, MDSan Jose, CA 951191093891509
  16. Michael Ringer, MDModesto, CA 953501184611220
  17. George Rishwain, M.D.Stockton, CA 952041598738122
  18. Claudio Rivera, MD, MPHMission Hills, CA 913451144594045
  19. Jesus Rivera-Nieves, M.D.San Diego, CA 921031437228079
  20. Nayna Riyat, M.D.Stanford, CA 943051508122656
  21. Azam Riyaz, MDTorrance, CA 905051184613382
  22. John Roark, MDOakland, CA 946021609834266
  23. Gerald Roberts, M.D.San Francisco, CA 941151982670220
  24. Stanley Rockman, M.D.San Mateo, CA 944031447318829
  25. Vance Rodgers, M.D.San Luis Obispo, CA 934011427039916
  26. Daniel Rodiles, M.D.Los Alamitos, CA 907201497789960
  27. Daniald Rodrigues, M.D.Mission Viejo, CA 926911174767230
  28. Carlos Rodriguez, M.D.Bakersfield, CA 933061164420840
  29. Richard Roehrkasse, MDGrass Valley, CA 959491083234017
  30. Stephan Rogalla, MDStanford, CA 943051831678689
  31. Micha Rojany, MDSacramento, CA 958171073553681
  32. Bhupinder Romana, MDManteca, CA 953361710319447
  33. Christopher Rombaoa, M.D.San Jose, CA 951281225457211
  34. Christopher Romberg, MDCameron Park, CA 956821215096953
  35. Andrew Roorda, M.D.Palo Alto, CA 943041881861540
  36. Jennifer Roost, M.D.Stanford, CA 943051790796449
  37. Kenneth Roost, MDBurlingame, CA 940101801850508
  38. Jose Roque, M.D.Orange, CA 928681154362010
  39. Ulysses Rosas, MDRancho Mirage, CA 922701043664931
  40. Peter Rosenberg, M.D.Pasadena, CA 911051104890664
  41. Elizabeth Ross, M.D.San Francisco, CA 941151437358967
  42. Kathryn Ross, M.D.Newport Beach, CA 926601871537035
  43. Soraya Ross, MDBeverly Hills, CA 902111649209628
  44. Lorenzo Rossaro, MDWoodland, CA 956951750368163
  45. Bennett Roth, MDLos Angeles, CA 900951912927906
  46. Christine Roth, PABeverly Hills, CA 902111346754983
  47. Michael Rothenberg, M.D., PH.D.Stanford, CA 943051306014071
  48. Gerald Rothman, MDWest Hills, CA 913071164489977
  49. Jeffrey Rothman, M.D.Santa Rosa, CA 954011528037124
  50. Smita Rouillard, MDFresno, CA 937201144308982

Source: CMS NPPES, primary taxonomy 207RG0100X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 25 of 51 per resident

  1. Colorado5.7
  2. Hawaii5.6
  3. South Carolina5.6
  4. California5.5
  5. Michigan5.5
  6. Arizona5.4
  7. 50 states and D.C.6.2

Source: CMS NPPES, primary taxonomy 207RG0100X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

83.1% of these records appear in a Medicare file, against 84.4% 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. California83.1%
  2. United States84.4%

Gastroenterology Physician records in California, measured

  • In a Medicare file1,779 of 2,140 · 83.1% here, 84.4% nationally
  • In the CMS Doctors and Clinicians file1,538 · 71.9% here, 73.7% nationally
  • Not updated in five years or more1,280 · 59.8% here, 55.6% nationally
  • Median graduation year2002 · the 1,538 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207RG0100X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

2,140 NPPES records list gastroenterology physician (207RG0100X) as their primary taxonomy with a practice address in California: 5.5 per 100,000 residents against 6.2 nationally (50 states and D.C.). Los Angeles has 195 of them (9%).

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. New York1,797
  2. Florida1,513
  3. Texas1,478
  4. Pennsylvania1,049

States with a similar rate per 100,000

  1. Michigan5.5
  2. Arizona5.4
  3. Indiana5.4
  4. Vermont5.4

The largest states

  1. New York1,797
  2. Florida1,513
  3. Texas1,478
  4. Pennsylvania1,049
  5. Illinois887

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.