Metformin (Glucophage, Fortamet) Prescribers in Guam

1. 1
   James NozakiM.D.

   Family Medicine Physician · Tamuning, GU

   345 Medicare Part D claims (2024)

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2. 2
   George MacrisMD

   Undersea and Hyperbaric Medicine (Preventive Medicine) Physician · Dededo, GU

   301 Medicare Part D claims (2024)

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3. 3
   Karlene DrummerM.D.

   Family Medicine Physician · Lithonia, GU

   243 Medicare Part D claims (2024)

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4. 4
   John TaitanoMD

   Internal Medicine Physician · Tamuning, GU

   240 Medicare Part D claims (2024)

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5. 5
   Faraz OuhadiM.D.

   Specialist · Tamuning, GU

   220 Medicare Part D claims (2024)

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6. 6
   Johnny LimM.D.

   Internal Medicine Physician · Tamuning, GU

   197 Medicare Part D claims (2024)

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7. 7
   Erika AlfordMD

   Endocrinology, Diabetes & Metabolism Physician · Tamuning, GU

   182 Medicare Part D claims (2024)

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8. 8
   Shishin MiyagiM.D

   Family Medicine Physician · Tamuning, GU

   170 Medicare Part D claims (2024)

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9. 9
   Alix ChenetMD

   Internal Medicine Physician · Oka Tamuning, GU

   148 Medicare Part D claims (2024)

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10. 10
    Leopoldo ArcillaMD

    Internal Medicine Physician · Mangilao, GU

    136 Medicare Part D claims (2024)

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11. 11
    Edwin SupitM.D.

    Internal Medicine Physician · Tamuning, GU

    134 Medicare Part D claims (2024)

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12. 12
    Peter Kh GoM.D.

    Surgery Physician · Tamuning, GU

    117 Medicare Part D claims (2024)

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13. 13
    Hoa NguyenMD

    Family Medicine Physician · Upper Tumon, GU

    112 Medicare Part D claims (2024)

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14. 14
    Jonathon ThorpM.D.

    Internal Medicine Physician · Tamuning, GU

    105 Medicare Part D claims (2024)

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15. 15
    Hieu CampusMD

    Family Medicine Physician · Dededo, GU

    100 Medicare Part D claims (2024)

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16. 16
    Doris LimM.D.

    Internal Medicine Physician · Tamuning, GU

    92 Medicare Part D claims (2024)

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17. 17
    Joel Marc RubioMD

    Endocrinology, Diabetes & Metabolism Physician · Dededo, GU

    88 Medicare Part D claims (2024)

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18. 18
    Daniel DebardelebenMD

    Family Medicine Physician · Tamuning, GU

    85 Medicare Part D claims (2024)

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19. 19
    Amylie RojasMD

    Family Medicine Physician · Tamuning, GU

    75 Medicare Part D claims (2024)

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20. 20
    Vincent DuenasD.O.

    Internal Medicine Physician · Tamuning, GU

    69 Medicare Part D claims (2024)

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21. 21
    Arnie Lou BakerNP

    Family Nurse Practitioner · Tamuning, GU

    60 Medicare Part D claims (2024)

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22. 22
    Lisa FloresM.D.

    Sports Medicine (Neuromusculoskeletal Medicine) Physician · Tamuning, GU

    53 Medicare Part D claims (2024)

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23. 23
    Samuel FriedmanM.D.

    Hematology & Oncology Physician · Tamuning, GU

    52 Medicare Part D claims (2024)

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24. 24
    Young ChangMD

    Internal Medicine Physician · Tamuning, GU

    48 Medicare Part D claims (2024)

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25. 25
    Florencio LizamaM.D.

    Internal Medicine Physician · Tamuning, GU

    45 Medicare Part D claims (2024)

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26. 26
    Dennise SalazarPA-C

    Physician Assistant · Sinajana, GU

    33 Medicare Part D claims (2024)

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27. 27
    Gemma Sto NinoFNP

    Family Nurse Practitioner · Tamuning, GU

    32 Medicare Part D claims (2024)

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28. 28
    Luan NguyenM.D.

    Family Medicine Physician · Tamuning, GU

    32 Medicare Part D claims (2024)

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29. 29
    Ginger HanyPA-C

    Primary Care Nurse Practitioner · Tamuning, GU

    31 Medicare Part D claims (2024)

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30. 30
    Delores LeeM.D.

    Family Medicine Physician · Dededo, GU

    30 Medicare Part D claims (2024)

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31. 31
    Edmund SchroederMD

    Geriatric Medicine (Family Medicine) Physician · Dededo, GU

    23 Medicare Part D claims (2024)

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32. 32
    Emiliza CornejoRN, APRN

    Nurse Practitioner · Dededo, GU

    20 Medicare Part D claims (2024)

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33. 33
    Arania AdolphsonMD

    Family Medicine Physician · Dededo, GU

    20 Medicare Part D claims (2024)

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34. 34
    Geoffrey GalgoDOCTOR OF MEDICINE

    Specialist · Tamuning, GU

    19 Medicare Part D claims (2024)

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35. 35
    Walter StrattonPA-C

    Physician Assistant · Tamuning, GU

    18 Medicare Part D claims (2024)

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36. 36
    Rhodora CruzAPRN, FNP-C

    Family Nurse Practitioner · Tamuning, GU

    17 Medicare Part D claims (2024)

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37. 37
    Patrick SantosMD

    Family Medicine Physician · Upper Tumon, GU

    13 Medicare Part D claims (2024)

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38. 38
    Vincent AkimotoMD

    Family Medicine Physician · Upper Tumon, GU

    12 Medicare Part D claims (2024)

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39. 39
    Helene TuncapPA-C

    Physician Assistant · Tamuning, GU

    12 Medicare Part D claims (2024)

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40. 40
    Jeremy RaabM.D.

    Family Medicine Physician · Tamuning, GU

    11 Medicare Part D claims (2024)

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Medicare Part D only. Counts and ordering reflect Medicare Part D claims (2024) from CMS — they exclude cash-pay, commercial, and Medicaid prescriptions and undercount cash-pay categories (e.g. GLP-1 weight-loss, testosterone). Not a quality or "best" ranking. Absence does not mean a provider does not prescribe metformin. Source: CMS NPPES (June 2026).