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 40 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. Vivaik Tyagi, M.D.Lancaster, CA 935341073612545
  2. Michael Udkow, MDOakland, CA 946111952489742
  3. Barton Ueki, M.D.Whittier, CA 906021043219355
  4. Maria Sandra Umali, M.D.Newhall, CA 913211790817328
  5. Jason Umphress, M.D.Woodland, CA 956951194741595
  6. Lance Uradomo, M.D.Irvine, CA 926181316970171
  7. Shiro Urayama, M.D.Sacramento, CA 958171679520407
  8. Atul Vachhani, MDSanta Maria, CA 934581609890748
  9. Ivaylo Vagliarsky, M.D.Bakersfield, CA 933091558324913
  10. Randell Vallero, MDRoseville, CA 956611669512687
  11. Nalini Valluru, MBBSCarmichael, CA 956081699087957
  12. Jacques Van Dam, M.D., PH.D.Los Angeles, CA 900331518001791
  13. Gary Van Deventer, MDSanta Barbara, CA 931051285628933
  14. Albert Varner, MDGreenbrae, CA 949041023071925
  15. David Varon, M.D.Concord, CA 945201184702656
  16. Satya Vashishtha, MDBakersfield, CA 933011588731350
  17. Eric Vasiliauskas, M.D.West Hollywood, CA 900481114955135
  18. David VealOrange, CA 928681336467505
  19. Annamalai Veerappan, M.D.Fremont, CA 945381881628451
  20. Fernando Velayos, MDSan Francisco, CA 941151942318928
  21. Chandra Veluru, MDYuba City, CA 959911750595443
  22. Rajesh Veluvolu, MDTemecula, CA 925921023300399
  23. Jeffery Venner, MD MSC FRCPCWest Hollywood, CA 900481972454965
  24. Vino Verghese, MDBurlingame, CA 940101912906272
  25. Elijah VerheyenCorte Madera, CA 949251780047332
  26. Michael Verhille, M.D.San Francisco, CA 941151851324537
  27. Rahul Verma, MDStanford, CA 943051215002449
  28. Liana Vesga, MDOakland, CA 946121225058159
  29. Sandy VienSacramento, CA 958171033795711
  30. Matthew Viernes, M.D.Oceanside, CA 920561730158650
  31. Vincente Villa, M.D.Glendale, CA 912041578591368
  32. Silvia Villagomez, MDOakland, CA 946121790743359
  33. Blanca Viramontes, MDFontana, CA 923351023185931
  34. Omar Viramontes, MDSanta Maria, CA 934581801356126
  35. Gurjiwan Virk, M.DFresno, CA 937201134583891
  36. Bailey V Vittal, MDSan Jose, CA 951161477594604
  37. Harsha Vittal, MDSan Jose, CA 951161245308931
  38. Sheba Vohra, M.D.San Rafael, CA 949031285957670
  39. Mehrdad Vosoghi, M.D.Los Angeles, CA 900361467499350
  40. Michelle Vu, M.D.Downey, CA 902421164715439
  41. Hongha Vu James, M.D.Walnut Creek, CA 945971174798805
  42. Sanya Wadhwa, M.D.Oakland, CA 946121003234501
  43. Ismail Wadiwala, MDManteca, CA 953361275502171
  44. Anastasia Waechter, M.D.Sacramento, CA 958171992841688
  45. Ali Wakil, MDLos Angeles, CA 900951730609637
  46. Ronald Waloff, MDFreedom, CA 950191770547465
  47. Michael Walter, M.D.Loma Linda, CA 923541154342699
  48. Bruce Wang, M.D.San Francisco, CA 941431932436128
  49. Charles Wang, MDOakland, CA 946121134389810
  50. Connie WangSan Francisco, CA 941431073967204

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.