NPPES file of Aug 9, 2026

Internal Medicine Physician in Colorado

2,046 NPPES records list internal medicine physician with a practice address in Colorado, 35 per 100,000 residents, the 35th highest rate of 51. Denver and Aurora have the most; each record links to the provider's NPI and the Colorado license search. Page 27 of 41.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207R00000X · method

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

Denver has the most, 493

  1. Denver493
  2. Aurora244
  3. Colorado Springs169
  4. Pueblo91
  5. Boulder74

Internal Medicine Physician records in Colorado

  1. Jason Nguyen, MDDenver, CO 802041306056536
  2. Lynda Nguyen, MDAurora, CO 800141922185586
  3. Ngan Nguyen, M.D.Denver, CO 802621114110434
  4. Quoc Nguyen, D.O.Englewood, CO 801131760832000
  5. Trang Nguyen, M.D.Lakewood, CO 802261982990628
  6. Kevin Ni, MD, PHDDenver, CO 802041164008678
  7. Peter Nicholson, MDWestminster, CO 800311629103585
  8. Jacinda Nicklas, M.D., MPHAurora, CO 800451063549970
  9. Susan Nikels, MDAurora, CO 800451164456489
  10. Iwona Nimptsch-Kossek, MDColorado Springs, CO 809091205830866
  11. Joseph Nissim, MDLongmont, CO 805011780765024
  12. Randy Nitcher, D.O.Fort Carson, CO 809131659463883
  13. Allison Nitsch, MDDenver, CO 802041831488790
  14. Leon Noel, M.D.Denver, CO 802111245532720
  15. Mark Norden, MDFrisco, CO 804431881670131
  16. David Nordstrom, MDColorado Springs, CO 809201215932942
  17. John Norton, MDColorado Springs, CO 809071831145150
  18. Lucia Notardonato, MDParker, CO 801381982165015
  19. Marianne Novelli, MDDenver, CO 802471235266230
  20. Bonnie Nowak, MDFort Collins, CO 805251326049016
  21. Ilka Nowak, M.D.Denver, CO 802381114976776
  22. Norman Numerof, M.D.Avon, CO 816201720192776
  23. Grace Nweke, MDColorado Springs, CO 809091346209384
  24. Ifeanyichukwu Nwobodo, M.D.Aurora, CO 800161497922074
  25. Kathleen Nylin, RNDenver, CO 802471457488330
  26. Jennifer O'Brien, M.D.Greenwood Village, CO 801111235354796
  27. Kelly O'Brien, MDDenver, CO 802041841300407
  28. Raechel O'Kelley, MDDenver, CO 802201811988314
  29. Melissa O'Meara, M.D.Vail, CO 816571518346378
  30. Brian O'SullivanCentennial, CO 801221801926662
  31. Wendy Oatis, MDColorado Springs, CO 809101568507242
  32. Tyson OberndorferAurora, CO 800451932542917
  33. Augustine Obinnah, M.D.Denver, CO 802491558412494
  34. Steven Obrien, MDGlenwood Springs, CO 816011174623193
  35. Katherine Ochoa, M.D.Denver, CO 802041821482027
  36. Marek Odehnal, MDLongmont, CO 805011780643262
  37. Atsuko Ohtake, M.D.Denver, CO 802471114061819
  38. Andrew Okpe, MD, MRCP(UK)Colorado Springs, CO 809091366095903
  39. Michael Oleary, MDEnglewood, CO 801131346254885
  40. Kenneth Oleszek, MDDenver, CO 802061902878291
  41. Jed Olson, M.D.Aurora, CO 800451134256167
  42. Samuel Olson, MDLone Tree, CO 801241326665654
  43. Seth Olson, D.O.Aurora, CO 800121144581943
  44. Timothy Olson, M.D.Aurora, CO 800451699099143
  45. Stuart Olvey, M.D.Colorado Springs, CO 809071770582728
  46. Maurine Onat, MDDenver, CO 802101225129232
  47. Pierre Onda, MDAurora, CO 800121811024797
  48. Gboluwaga Orebiyi, MDWheat Ridge, CO 800331588866651
  49. Sander Orent, M.D.Broomfield, CO 800201154492635
  50. David Orgel, M.D.Denver, CO 802021013091636

Source: CMS NPPES, primary taxonomy 207R00000X: records by practice city and the list of records, file of Aug 9, 2026.

Colorado ranks 35 of 51 per resident

  1. Georgia35
  2. Wisconsin35
  3. South Carolina35
  4. Colorado35
  5. Kansas34
  6. Kentucky34
  7. 50 states and D.C.44

Source: CMS NPPES, primary taxonomy 207R00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

70.8% of these records appear in a Medicare file, against 78.7% 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. Colorado70.8%
  2. United States78.7%

Internal Medicine Physician records in Colorado, measured

  • In a Medicare file1,448 of 2,046 · 70.8% here, 78.7% nationally
  • In the CMS Doctors and Clinicians file1,091 · 53.3% here, 61.4% nationally
  • Not updated in five years or more1,240 · 60.6% here, 55.4% nationally
  • Median graduation year2006 · the 1,090 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207R00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

2,046 NPPES records list internal medicine physician (207R00000X) as their primary taxonomy with a practice address in Colorado: 35 per 100,000 residents against 44 nationally (50 states and D.C.). Denver has 493 of them (24%).

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. Wisconsin2,078
  2. Indiana2,109
  3. Oregon2,116
  4. South Carolina1,881

States with a similar rate per 100,000

  1. Kansas34.3
  2. Georgia35.5
  3. Puerto Rico35.7
  4. Kentucky33.7

The largest states

  1. California17,696
  2. New York12,067
  3. Florida10,151
  4. Texas9,175
  5. Pennsylvania7,300

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.