Metformin (Glucophage, Fortamet) Prescribers in California

1. 1
   Abbas HasnainM.D., J.D.

   Internal Medicine Physician · Fresno, CA

   3,294 Medicare Part D claims (2024)

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2. 2
   Armine NazaryanM.D.

   Family Medicine Physician · Glendale, CA

   3,099 Medicare Part D claims (2024)

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3. 3
   Kelvin MaiDO

   Internal Medicine Physician · Santa Ana, CA

   2,599 Medicare Part D claims (2024)

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4. 4
   Vagharshak PilossyanM.D.

   Family Medicine Physician · Van Nuys, CA

   2,103 Medicare Part D claims (2024)

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5. 5
   Vardui ArutyunyanMD

   Family Medicine Physician · Glendale, CA

   2,088 Medicare Part D claims (2024)

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6. 6
   William BichaiM.D.

   Nephrology Physician · Bakersfield, CA

   2,080 Medicare Part D claims (2024)

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7. 7
   Michael LinMD

   Endocrinology, Diabetes & Metabolism Physician · San Gabriel, CA

   2,058 Medicare Part D claims (2024)

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8. 8
   Soo Kang

   Internal Medicine Physician · Buena Park, CA

   1,960 Medicare Part D claims (2024)

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9. 9
   Ajay MekaM.D.

   Internal Medicine Physician · Santa Ana, CA

   1,944 Medicare Part D claims (2024)

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10. 10
    Leon KujmanianM.D.

    Endocrinology, Diabetes & Metabolism Physician · Glendale, CA

    1,936 Medicare Part D claims (2024)

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11. 11
    Mark SongMD, PHD

    Nephrology Physician · Los Angeles, CA

    1,878 Medicare Part D claims (2024)

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12. 12
    Jason PaekM.D.

    Internal Medicine Physician · Rowland Heights, CA

    1,857 Medicare Part D claims (2024)

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13. 13
    Jorge RoblesMD

    Family Medicine Physician · El Centro, CA

    1,853 Medicare Part D claims (2024)

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14. 14
    Garbis ApelianMD

    Family Medicine Physician · Van Nuys, CA

    1,836 Medicare Part D claims (2024)

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15. 15
    Tai WuMD

    Internal Medicine Physician · San Gabriel, CA

    1,817 Medicare Part D claims (2024)

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16. 16
    Chinh MaiMD

    Internal Medicine Physician · Westminster, CA

    1,815 Medicare Part D claims (2024)

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17. 17
    Paul ChangM.D.

    Internal Medicine Physician · Buena Park, CA

    1,789 Medicare Part D claims (2024)

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18. 18
    Henrik KhatchatourianMD

    Family Medicine Physician · Glendale, CA

    1,771 Medicare Part D claims (2024)

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19. 19
    Bashar SaadMD

    Endocrinology, Diabetes & Metabolism Physician · San Dimas, CA

    1,754 Medicare Part D claims (2024)

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20. 20
    Tung NguyenDO

    Family Medicine Physician · San Jose, CA

    1,744 Medicare Part D claims (2024)

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21. 21
    Michael DaoM.D.

    Internal Medicine Physician · Garden Grove, CA

    1,727 Medicare Part D claims (2024)

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22. 22
    Gevork MaissianD.O.

    Internal Medicine Physician · Glendale, CA

    1,677 Medicare Part D claims (2024)

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23. 23
    Ilya RachmanM.D.

    Internal Medicine Physician · Reseda, CA

    1,667 Medicare Part D claims (2024)

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24. 24
    Asha Pritpal SidhuMD

    Internal Medicine Physician · Fresno, CA

    1,665 Medicare Part D claims (2024)

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25. 25
    Zarmen IsraelianM.D.

    Endocrinology, Diabetes & Metabolism Physician · Glendale, CA

    1,663 Medicare Part D claims (2024)

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26. 26
    Mark SamonteM.D.

    Anatomic Pathology & Clinical Pathology Physician · Carson, CA

    1,644 Medicare Part D claims (2024)

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27. 27
    Zarine Ter-PoghosyanM.D.

    Family Medicine Physician · Burbank, CA

    1,618 Medicare Part D claims (2024)

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28. 28
    Vlad NusinovichM.D.

    Internal Medicine Physician · West Hollywood, CA

    1,611 Medicare Part D claims (2024)

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29. 29
    Bao NguyenMD

    Family Medicine Physician · Stockton, CA

    1,606 Medicare Part D claims (2024)

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30. 30
    Brittany BrinleyD.O.

    Internal Medicine Physician · Bakersfield, CA

    1,519 Medicare Part D claims (2024)

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31. 31
    Michael BazelMD

    Emergency Medicine Physician · Bell, CA

    1,515 Medicare Part D claims (2024)

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32. 32
    Mary TranD.O.

    Family Medicine Physician · Garden Grove, CA

    1,508 Medicare Part D claims (2024)

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33. 33
    Domingo BarrientosM.D.

    Internal Medicine Physician · Downey, CA

    1,487 Medicare Part D claims (2024)

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34. 34
    Kien TranMD

    Internal Medicine Physician · Tustin, CA

    1,467 Medicare Part D claims (2024)

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35. 35
    Dale BrentMD

    Internal Medicine Physician · Sherman Oaks, CA

    1,462 Medicare Part D claims (2024)

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36. 36
    Cheng-Yang TuanMD

    Endocrinology, Diabetes & Metabolism Physician · San Francisco, CA

    1,435 Medicare Part D claims (2024)

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37. 37
    Rebecca ZulimM.D.

    Surgery Physician · Visalia, CA

    1,431 Medicare Part D claims (2024)

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38. 38
    Daniel FrancoM.D.

    Family Medicine Physician · San Bernardino, CA

    1,426 Medicare Part D claims (2024)

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39. 39
    Narine ArutyounianM.D.

    Family Medicine Physician · Glendale, CA

    1,422 Medicare Part D claims (2024)

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40. 40
    Paramjit TakharMD

    Family Medicine Physician · Sacramento, CA

    1,408 Medicare Part D claims (2024)

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41. 41
    Shahriar JarchiM.D.

    Internal Medicine Physician · Los Angeles, CA

    1,391 Medicare Part D claims (2024)

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42. 42
    Manvel MazmanyanM.D.

    Family Medicine Physician · Glendale, CA

    1,378 Medicare Part D claims (2024)

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43. 43
    Arutyun TopsakalyanMD

    General Practice Physician · Glendale, CA

    1,344 Medicare Part D claims (2024)

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44. 44
    Fariba JavaherianM.D

    Dermatology Physician · Northridge, CA

    1,341 Medicare Part D claims (2024)

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45. 45
    Zaven ArslanianM.D.

    General Practice Physician · Glendale, CA

    1,327 Medicare Part D claims (2024)

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46. 46
    Jose LopezM.D.

    Internal Medicine Physician · Chula Vista, CA

    1,326 Medicare Part D claims (2024)

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47. 47
    Huynh TranMD, DPD

    Rheumatology Physician · Rosemead, CA

    1,304 Medicare Part D claims (2024)

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48. 48
    Prem SalhotraM.D.

    Internal Medicine Physician · Yucca Valley, CA

    1,296 Medicare Part D claims (2024)

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49. 49
    Taymour MalakM.D.

    Family Medicine Physician · Stockton, CA

    1,275 Medicare Part D claims (2024)

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50. 50
    William SimMD

    Internal Medicine Physician · Downey, CA

    1,271 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).