William Sim , MD

Male Internal Medicine

Health Plans

  • 1 Select Region – Select region is a catch all for the rest of Los Angeles County and all Orange County areas. We recommend these IDs for Members who live outside of the Downey, St Francis, or Whittier region areas.
  • 2 St. Francis Region – A provider network built around our partner hospital, St Francis Medical Center, for better care coordination to members living in Lynwood and the surrounding cities.
  • 3 Downey Region – A provider network built around our partner hospital, PIH Health – Downey, for better care coordination to members living in Downey and the surrounding cities.
  • 4 Whittier Region – A provider network built around our partner hospital, Whittier Hospital Medical Center, for better care coordination to members living in Whittier and the surrounding cities.
Additional languages spoken: Korean
School: Stanford University School Of Medicine
Internship: UCLA Medical Center
Residency: UCLA Medical Center

Call to make an appointment

1-562-806-0874

Call Optum Care Network member services

1-800-460-5051, TTY 711
Monday – Friday, 8:00 am to 5:00 pm

  • 1 Select Region – Select region is a catch all for the rest of Los Angeles County and all Orange County areas. We recommend these IDs for Members who live outside of the Downey, St Francis, or Whittier region areas.
  • 2 St. Francis Region – A provider network built around our partner hospital, St Francis Medical Center, for better care coordination to members living in Lynwood and the surrounding cities.
  • 3 Downey Region – A provider network built around our partner hospital, PIH Health – Downey, for better care coordination to members living in Downey and the surrounding cities.
  • 4 Whittier Region – A provider network built around our partner hospital, Whittier Hospital Medical Center, for better care coordination to members living in Whittier and the surrounding cities.
  • 11480 Brookshire Ave Ste 200 Downey, CA 90241, Get Directions
    Phone: 1-562-806-0874
    MON: 7:30AM - 4:30PM
    TUE: 7:30AM - 4:30PM
    WED: 7:30AM - 4:30PM
    THU: 7:30AM - 4:30PM
    FRI: 7:30AM - 4:30PM
Additional languages spoken: Korean
School: Stanford University School Of Medicine
Internship: UCLA Medical Center
Residency: UCLA Medical Center

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