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 27 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. Bret Namihas, M.D.Redding, CA 960011215949722
  2. David Nano, MDMountain View, CA 940401952317539
  3. Subhendu Narayan, M.D.Berkeley, CA 947051427169002
  4. Kiran Narsinh, M.D.San Pablo, CA 948061730316977
  5. Jessica Nash, DOSonora, CA 953701437670544
  6. Aida NasirisharghSacramento, CA 958171417423401
  7. Laya NasrollahCamarillo, CA 930121558673566
  8. Sepehr NassiriWest Hollywood, CA 900481508746611
  9. Igor Nastaskin, MDSanta Maria, CA 934581619014776
  10. Badri Nath, MDRancho Mirage, CA 922701558389536
  11. Seyedehsan Navabi, M.D.Murrieta, CA 925631801229109
  12. Hamed Nayeb-HashemiLos Angeles, CA 900951285874990
  13. Gaspar Nazareno, M.D.Modesto, CA 953551326096603
  14. Otto Nebel, M.D.La Jolla, CA 920371851323992
  15. Bijan Nejadnik, MDSan Ramon, CA 945821285726646
  16. Prachi Nene, M.D.Burlingame, CA 940101124481619
  17. Leila Neshatian, MDStanford, CA 943051710275722
  18. Andrew Nett, M.D.San Francisco, CA 941091871720581
  19. Vincent Ng, MDBaldwin Park, CA 917061376691352
  20. Vivian Ng, M.D.Redwood City, CA 940631700026416
  21. Kevin Ng-Tang, PA-CSan Francisco, CA 941151134647811
  22. Catherine Ngo, M.D.Laguna Hills, CA 926531558531129
  23. Adrienne Nguyen, MDSan Carlos, CA 940701376635219
  24. Alexander Nguyen, MDTorrance, CA 905051427476233
  25. Andrew Nguyen, MDDowney, CA 902411154784783
  26. Bao Sean Nguyen, MDTorrance, CA 905051396249702
  27. Bich-Thuy Nguyen, MDHarbor City, CA 907101114075066
  28. Douglas Nguyen, MDMission Viejo, CA 926911184880114
  29. Duke Nguyen, MDFountain Valley, CA 927081679557797
  30. Huy Nguyen, M.D.San Jose, CA 951161073517306
  31. Ken Nguyen, M.D.Temple City, CA 917801205193828
  32. Khanh Nguyen, M.D.San Jose, CA 951161770585044
  33. Khoi Nguyen, M.D.Apple Valley, CA 923071013976174
  34. Lanchinh Nguyen, MDVacaville, CA 956881487732921
  35. Linda Anh Nguyen, M.D.Newport Beach, CA 926631750303152
  36. Michelle Nguyen, MDLos Gatos, CA 950321811967920
  37. Minh Nguyen, M.D.Torrance, CA 905051922254432
  38. Nghia NguyenSan Diego, CA 921031154718997
  39. Phuong Nguyen, M.D.Newport Beach, CA 926631801838750
  40. Steve Nguyen, D.O.Rosemead, CA 917701649357732
  41. Thai-Van Nguyen, M.D.Los Alamitos, CA 907201427082890
  42. Thomas Thong Nguyen, M.D.,Victorville, CA 923951215126800
  43. Tu Nguyen, MDMenlo Park, CA 940251497841969
  44. Tuan Nguyen, MDSan Diego, CA 921051730270380
  45. Heng Nhoung, MDFresno, CA 937011568191476
  46. Quan Nhu, M.D., PH.D.La Jolla, CA 920371568874675
  47. Richard Nickowitz, MDPasadena, CA 911051083686893
  48. Henry Niho, M.D.Irvine, CA 926181609040450
  49. Cheikh Njie, MDSan Francisco, CA 941431043700370
  50. Ryan Nock, MDVallejo, CA 945891346773751

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.