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 28 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. Richard Nodurft, M.D.La Jolla, CA 920371265540843
  2. Carl Nordstrom, M.D.Santa Monica, CA 904041528298528
  3. Daniel Norman, MDSouth Lake Tahoe, CA 961501962471276
  4. Michael Northcutt, M.D.Burlingame, CA 940101700204443
  5. Thomas Norum, M.D.La Quinta, CA 922531013921360
  6. Nabil Noureddin, M.D.La Jolla, CA 920371972037026
  7. Megan Novo, MDOceanside, CA 920561770961971
  8. Benjamin NulsenSanta Monica, CA 904041467795377
  9. Robert Oakley, MDSan Diego, CA 921201659448561
  10. Emmanuel Obanor, DOLodi, CA 952401689615007
  11. Luis Ocampo, M.D.San Jose, CA 951191831480466
  12. Florence-Damilola Odufalu, M.D.Los Angeles, CA 900331245642917
  13. Tommy Oei, MDFontana, CA 923351033286844
  14. Janice Oh, MDSan Diego, CA 921111417586082
  15. Pilsoo Oh, MDLos Angeles, CA 900201043296866
  16. Jun-Ichi Ohara, M.D., PH.D.Irvine, CA 926181578665667
  17. Sushil Ojha, MDDowney, CA 902411053377093
  18. Snorri Olafsson, M.D.Loma Linda, CA 923541033136809
  19. Asghar Oliai, M.D.Mission Viejo, CA 926911811902620
  20. Michael Oliver, MDCovina, CA 917231487613014
  21. Harvey Olsen, M.D.Orinda, CA 945631780679647
  22. Calvin Olson, MDModesto, CA 953551740230713
  23. Matthew Oman, M.D.Loma Linda, CA 923501548461155
  24. Bishr Omary, MD, PHDPalo Alto, CA 943041649369844
  25. Christopher Orpiano, D.O.Fowler, CA 936251841667458
  26. Ronald OrtizoRiverside, CA 925071124405956
  27. Masaharu Osato, M.D.Torrance, CA 905051265470280
  28. Robert Osterhoff, M.D.Burlingame, CA 940101801028907
  29. James Ostroff, MDSan Francisco, CA 941171477505881
  30. Mark Ovsiowitz, MDLos Angeles, CA 900951881712370
  31. Robert Owen, M.D.San Francisco, CA 941211639111628
  32. Katharine Ozeki, M.D.Walnut Creek, CA 945961306290838
  33. Vikas Pabby, M.D.Burbank, CA 915051518061563
  34. Laura Pace, M.D., PH.D.Oakland, CA 946071104142025
  35. Leybelis Padilla, MDSan Diego, CA 921341043501208
  36. David Padua, M.D.Los Angeles, CA 900451083915763
  37. Marco Paez, M.D.Corona, CA 928821902167695
  38. Christopher Paiji, MDOrange, CA 928681720519010
  39. Paul Paik, MDLos Angeles, CA 900331134756414
  40. Philip Pailey, MDEl Cajon, CA 920191336265610
  41. Jaesoo Pak, M.D.Cerritos, CA 907031023124054
  42. Seyed Pakseresht, MDSan Ramon, CA 945831437389327
  43. Joseph Boyd Palascak, MDSanta Cruz, CA 950651407833254
  44. Albert Palitz, MDMartinez, CA 945531255419735
  45. Renee Palta, D.O.Whittier, CA 906031497910251
  46. Vijayamalini Pampati, DOLos Angeles, CA 900271225109119
  47. Dana Pan, MDSan Gabriel, CA 917761265842934
  48. Jason Pan, MDLos Angeles, CA 900951922410042
  49. Jennifer Pan, M.D.Palo Alto, CA 943041417272592
  50. Hemant Pande, M.D.Sherman Oaks, CA 914031548306483

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.