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 43 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. Elliot Yu, M.D.Orange, CA 928681134651722
  2. Fang YuIrvine, CA 926181497869630
  3. Stanley Yu, MDFremont, CA 945381184763112
  4. Victor Yu, M.D.Irvine, CA 926181235205477
  5. Won Yu, M.D.Tustin, CA 927801720065303
  6. Jeng Yuh, M.D.Sylmar, CA 913421952438830
  7. Victoria YungWalnut Creek, CA 945981750670774
  8. Ramin Zabihi, MDMission Viejo, CA 926911508867193
  9. Ayesha Zahiruddin, MDOakland, CA 946021942598396
  10. Chester Zahn, MDSan Gabriel, CA 917761639146442
  11. Dennis Zai, MDAntioch, CA 945091740253350
  12. Oren Zaidel, M.D.Torrance, CA 905051689602195
  13. Walter Zajac, MDRoseville, CA 956611679651343
  14. Arwa Zakaria, DORancho Cucamonga, CA 917301184037046
  15. Timothy Zaki, MDLos Angeles, CA 900241790312486
  16. Maram Zakko, MDSan Diego, CA 921281972579068
  17. Sam Saeed Zamani, M.D.Walnut Creek, CA 945981972500148
  18. Thomas Zarchy, M.D.Los Angeles, CA 900331477598027
  19. Pejman Zargar, M.D.West Hills, CA 913041457714024
  20. Arash Zarimani, M.D.Los Angeles, CA 900171891855110
  21. Amir Zarrinpar, MD, PHDSan Diego, CA 921031417110917
  22. Richard ZelnerFountain Valley, CA 927081235274259
  23. John Zeroogian, M.D.Pasadena, CA 911051437149226
  24. Allison Zhang, MDSan Jose, CA 951241821435900
  25. Bing ZhangLoma Linda, CA 923501245627454
  26. Jian Zhang, MDBaldwin Park, CA 917061710054549
  27. Johnathan Zhang, MDSacramento, CA 958161346532132
  28. Yan Zhao, M.D.Loma Linda, CA 923571891915336
  29. Lida Zhen, M.D.Highland, CA 923461942256581
  30. Xin Zheng, D.O.Loma Linda, CA 923541215460282
  31. Yi Zheng, M.D.Walnut Creek, CA 945981851622427
  32. Alex ZhornitskiySacramento, CA 958171659729820
  33. Felix ZhouLos Angeles, CA 900481013741891
  34. Margaret Zhou, MDStanford, CA 943051184157992
  35. Wendy Zhou, DOSan Jose, CA 951281255835492
  36. Jiaming Zhu, M.D.Los Angeles, CA 900331316206444
  37. Todd Zimmerman, M.D.Carmichael, CA 956081073654620
  38. Touraj Zolfaghari, M.D.Mission Hills, CA 913451659537926
  39. Daniel Zovich, MDSan Luis Obispo, CA 934011538140017
  40. Bruce Zweiban, MDPanorama City, CA 914021477601284

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.