NPPES file of Aug 9, 2026

Radiation Oncology Physician in Washington

198 NPPES records list radiation oncology physician with a practice address in Washington, 2.5 per 100,000 residents, the 10th highest rate of 51. Seattle and Tacoma have the most; each record links to the provider's NPI and the Washington license search. Page 2 of 4.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 2085R0001X · method

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

Seattle has the most, 97

  1. Seattle97
  2. Tacoma10
  3. Kennewick8
  4. Spokane Valley8
  5. Vancouver8

Radiation Oncology Physician records in Washington

  1. Carrie Gotkowitz, M.D.Vancouver, WA 986841679576540
  2. Andrew Graff, DOTacoma, WA 984311811312812
  3. Thomas GriffinSeattle, WA 981121861794992
  4. Linda Grossheim, MDSpokane, WA 992041548211360
  5. Mark GroudineSeattle, WA 981951912082710
  6. Susan Guo, MDTacoma, WA 984051932375805
  7. Zachary Guss, MDSpokane, WA 992041497195762
  8. Mark HafermannBellevue, WA 980041730264532
  9. Lia Halasz, M.D.Seattle, WA 981951780735951
  10. William Hall, M.D.Bellingham, WA 982261790768513
  11. Sara Hardy, M.D.Seattle, WA 981951629368998
  12. Joseph Hartman, M.D.Lacey, WA 985031417934985
  13. Don Hebard, M.D.Seattle, WA 981011881745305
  14. Paul Herstein, M.D.Seattle, WA 981121740338052
  15. Stephen Hoffelt, MDVancouver, WA 986641194747733
  16. Richard Hsi, MDSeattle, WA 981011992815971
  17. Michael Hunter, MDSeattle, WA 981011386755312
  18. Lindsay JensenSequim, WA 983821649601386
  19. Gabrielle Kane, MDSeattle, WA 981951205026572
  20. John Kang, MD, PHDSeattle, WA 981951093100166
  21. Kylie Kang, MDSeattle, WA 981951033613047
  22. Jennifer Keam, MDSeattle, WA 981951649370677
  23. Taylor KelleySeattle, WA 981951871381707
  24. Karie-Lynn Kelly, M.D.. F.R.C.P.C.Spokane Valley, WA 992161417027640
  25. Choong Kim, M.D.Longview, WA 986321023292950
  26. Edward Kim, M.D.Seattle, WA 981951811100746
  27. Janice Kim, M.D.Seattle, WA 981091942223151
  28. Wui-Jin Koh, MDSeattle, WA 981951972688786
  29. Michael Kos, MDSpokane Valley, WA 992161366599631
  30. Ryan Kraus, MDKennewick, WA 993361528509767
  31. Nicolas Kummer, M.D.-PH.D.Wenatchee, WA 988011033403852
  32. Susan Laing, MDSpokane, WA 992081164414785
  33. Wayne Lamoreaux, M.D.Spokane Valley, WA 992161831188036
  34. Daniel Landis, M.D.Seattle, WA 981331013930643
  35. George LaramoreSeattle, WA 981951457441313
  36. Christopher Lee, M.D.Spokane Valley, WA 992161043266810
  37. Won Lee, M.D.Vancouver, WA 986861902894793
  38. Jim Leng, MDSeattle, WA 981091548880982
  39. Felicia LewSeattle, WA 981951033806054
  40. Charles Leyrer, M.D.Seattle, WA 981221518301464
  41. Benjamin Li, MD, MBASeattle, WA 981951346744372
  42. Jay Liao, MDSeattle, WA 981951477764223
  43. Skyler Lindsley, M.D.Edmonds, WA 980261396746657
  44. Darren Little, M.D.Everett, WA 982011639137342
  45. Yilan LiuSeattle, WA 981951922758697
  46. Simon Lo, M.D.Seattle, WA 981951932163680
  47. Christopher Loiselle, M.D.Seattle, WA 981041225259187
  48. John Lytle, M.D.Redmond, WA 980531467877670
  49. Ting Martin Ma, MD, PH.D.Seattle, WA 981951467818369
  50. Dusten Macdonald, M.D.Joint Base Lewis McChord, WA 984311467550012

Source: CMS NPPES, primary taxonomy 2085R0001X: records by practice city and the list of records, file of Aug 9, 2026.

Washington ranks 10 of 51 per resident

  1. Oregon2.7
  2. Rhode Island2.6
  3. Wisconsin2.6
  4. Washington2.5
  5. Ohio2.5
  6. South Dakota2.4
  7. 50 states and D.C.2.1

Source: CMS NPPES, primary taxonomy 2085R0001X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

80.3% of these records appear in a Medicare file, against 82.3% 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. Washington80.3%
  2. United States82.3%

Radiation Oncology Physician records in Washington, measured

  • In a Medicare file159 of 198 · 80.3% here, 82.3% nationally
  • In the CMS Doctors and Clinicians file141 · 71.2% here, 74.0% nationally
  • Not updated in five years or more115 · 58.1% here, 54.6% nationally
  • Median graduation year2006 · the 141 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 2085R0001X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

198 NPPES records list radiation oncology physician (2085R0001X) as their primary taxonomy with a practice address in Washington: 2.5 per 100,000 residents against 2.1 nationally (50 states and D.C.). Seattle has 97 of them (49%).

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. Georgia180
  2. North Carolina230
  3. Minnesota160
  4. Michigan239

States with a similar rate per 100,000

  1. Ohio2.5
  2. Wisconsin2.6
  3. Rhode Island2.6
  4. South Dakota2.4

The largest states

  1. California735
  2. Florida520
  3. New York449
  4. Texas449
  5. Pennsylvania383

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.